United States – Air Travel

What is the standard of domestic air travel in the US like, and which routes and destinations are served?

By any measure, the United States commands the world’s largest domestic aviation market. In October 2024 alone, US domestic routes accommodated 91 million seats — a figure that dwarfs the air networks of countries like Germany, France, and Australia, where shorter distances mean that trains and roads can effectively substitute for flying. In the US, there is often no substitute at all.

The country’s vast size is the fundamental reason air travel is so deeply embedded in everyday life. The continental US stretches approximately 4,500 km from east to west, and both Hawaii and Alaska lie entirely detached from the mainland. Routes connecting the Hawaiian islands are among the most heavily used in the country — the Honolulu to Kahului (Maui) corridor alone generates hundreds of thousands of seats monthly and ranks among the most heavily flown short routes in the nation. Alaska occupies a category of its own: hundreds of remote communities there have no road connections at all, making small aircraft a genuine lifeline rather than a travel convenience.

On the continental landmass, the busiest air corridors link major commercial and population centres. In 2025, New York JFK to Los Angeles LAX ranked as the single busiest domestic route in the country, with 3.4 million seats offered across the year. LaGuardia to Chicago O’Hare came in second at 3.33 million seats. Other consistently high-volume corridors include Atlanta–Orlando, Las Vegas–Los Angeles, and Denver–Phoenix. Atlanta’s Hartsfield-Jackson airport functions as the United States’ largest hub, appearing on multiple top-ten route lists including Atlanta–Orlando and Atlanta–New York LaGuardia.

Flight frequency on well-travelled corridors is striking, with departures available throughout most of the day, sometimes on a near-hourly basis. Expats arriving from countries with developed high-speed rail networks — particularly in Europe or East Asia — will notice the absence of a comparable system in the US. Amtrak exists but its reach is limited, and on most longer journeys its travel times are simply not competitive with flying.

Which airlines operate domestic routes in the US, and are any low-cost carriers available?

Unlike many countries, the US has no national flag carrier — the airline industry here is entirely deregulated and privately operated. Approximately 63 airlines operate in the country, though ten carriers collectively account for around 90% of domestic passenger traffic. The market breaks down into legacy full-service carriers, a well-established low-cost segment, and a growing number of ultra-low-cost and niche operators.

The three dominant legacy airlines — American Airlines, Delta Air Lines, and United Airlines — form the backbone of the US network. American holds the largest market share at 21%, with primary hubs at Dallas–Fort Worth and Miami underpinning both domestic and international services. Delta commands a 19% share, operates primarily out of Atlanta, and has a strong reputation for on-time performance. United captures roughly 16% of domestic capacity and runs major hubs at Chicago O’Hare and Newark. Alaska Airlines, a fourth significant full-service carrier with approximately 5% of the market, focuses primarily on West Coast connectivity through its Seattle and Portland hubs.

The low-cost sector is well-developed and genuinely competitive. Southwest Airlines, the world’s largest low-cost carrier by fleet size, operates exclusively Boeing 737s across domestic routes as well as leisure destinations in Mexico, the Caribbean, and Central America. From hubs in Dallas, Chicago, and Denver, Southwest serves 106 domestic destinations and 15 international destinations across 12 countries as of 2025.

Ultra-low-cost carriers (ULCCs) offer the cheapest headline fares but apply an à la carte pricing model in which virtually every extra is charged separately. Frontier Airlines is frequently cited as the lowest-cost US carrier by revenue per seat mile and operates over 120 destinations across the US, Mexico, the Caribbean, and Central America, keeping overheads low through a single aircraft type strategy. Allegiant Air serves a distinct niche, concentrating on leisure routes that connect smaller US cities to popular holiday destinations such as Las Vegas and Orlando using a point-to-point network. Sun Country flies to approximately 140 destinations and blends scheduled services with charter and cargo operations, offering some onboard amenities such as in-seat power.

JetBlue sits between these two worlds — generally cheaper than the Big Three but with a more refined product than the ULCCs. JetBlue operates international services beyond Caribbean leisure routes, including flights to Canada and transatlantic services to Europe using Airbus A321 jets, placing it among the small group of US carriers currently flying to Europe. Newer operators such as Breeze Airways and Avelo Airlines have carved out space by targeting underserved secondary markets that larger carriers have historically overlooked.

How do you book domestic flights in the US — what are the options and which booking platforms are available?

The process of booking domestic flights in the US is well-developed and accessible, with a wide range of tools and channels available. The most common approach is booking directly through an airline’s own website or mobile app, which typically provides the full range of fare options and makes it easier to manage bookings, accumulate loyalty points, or request upgrades. All major carriers — American (aa.com), Delta (delta.com), United (united.com), Southwest (southwest.com) — maintain well-designed, easy-to-use digital platforms.

Third-party comparison sites allow travellers to scan fares from multiple airlines side by side. Google Flights, Kayak, Expedia, Priceline, and Hopper are all widely used in the US market. Google Flights is especially popular among regular travellers for its price calendar and flexible route search features. Hopper, a US-developed app, uses data modelling to advise whether current fares are likely to rise or fall, helping users decide when to buy.

Traditional travel agents still have a presence in the US, though self-service online booking is by far the dominant model for domestic travel. For particularly complex itineraries or large group bookings, an agent may be useful, but the majority of expats will find that direct booking or a comparison platform delivers the best combination of simplicity and value. Since fares on most airlines climb as aircraft fill up, buying early pays off — this matters especially for Thanksgiving, the Christmas and New Year stretch, and the peak summer months. On high-frequency corridors, though, last-minute availability does sometimes throw up unexpectedly reasonable fares.

One detail that surprises many new arrivals: Southwest Airlines does not make its fares available through any third-party booking platform. To see what Southwest charges, you must visit southwest.com directly. Forgetting to check Southwest is a common and easily avoidable oversight when comparing options.

What do domestic flights typically cost in the US, and what should expats budget for?

The average US domestic fare in September 2025 stood at approximately $217 gross (around $186 net). This blended figure covers all route lengths and booking classes; in practice, what any individual pays varies widely based on route, airline, how far in advance the ticket is purchased, and the time of year. Always verify current pricing directly with airlines or on comparison platforms, as fares fluctuate constantly.

On routes served by ultra-low-cost carriers, advertised base fares can appear as low as $29–$49, but these numbers rarely reflect what passengers ultimately pay once baggage fees, seat selection, and other charges are added. ULCCs structure their pricing so that virtually nothing beyond the seat itself is included in the base fare — carry-on bags, checked luggage, seat assignment, and even snacks all carry separate charges. Expats who are used to more inclusive fare structures elsewhere should treat headline prices with caution and calculate the full cost before drawing any comparison.

Ancillary fees are a feature of the market at every level. The Big Three legacy carriers — American, Delta, and United — collectively collected $3.9 billion in checked baggage fees in 2024, underscoring how embedded these charges have become across the industry. For most legacy carriers in 2025, a single checked bag typically costs around $35–$40 each way on the first bag, though specific fees vary by airline and fare class. Holding an airline-branded credit card or qualifying for elite status can often eliminate these fees.

Seasonality has a pronounced effect on pricing. Thanksgiving week in late November, the Christmas–New Year period, and the summer months from June through August are the most expensive times to fly. Fares on popular routes can double or even triple during these windows. Booking six to eight weeks ahead for peak-period travel is the standard guidance. Travelling mid-week — particularly Tuesday or Wednesday — and on less-popular routes can produce meaningful savings. Tools like the Google Flights price calendar make it easy to identify the cheapest days within a given travel window.

On major transcontinental routes such as New York to Los Angeles or Chicago to Seattle, economy return fares when booked in advance typically fall somewhere between $150 and $400, rising sharply at busy times. West Coast to Hawaii return fares can be found from around $300–$600, though premium cabin tickets and last-minute purchases push costs considerably higher. Check current fares directly with airlines or via comparison sites for accurate figures.

What are the main international airports in the US, and which ones are most relevant for expats?

The United States has numerous international entry points, but a relatively small number of airports handle the bulk of intercontinental traffic and are therefore most relevant for expats travelling to and from overseas.

New York area — John F. Kennedy International Airport (JFK) is the principal transatlantic and intercontinental gateway on the East Coast, handling flights from dozens of international carriers. Newark Liberty International (EWR) in New Jersey and LaGuardia (LGA) round out the New York metro area’s airport offering, though LaGuardia focuses primarily on domestic and short-haul services. JFK is accessible by the AirTrain connection to the subway and Long Island Rail Road, as well as by taxis and rideshare services.

Los Angeles — Los Angeles International (LAX) serves as the country’s main Pacific gateway and ranks among the busiest airports worldwide, with connections spanning Asia, Oceania, Latin America, and Europe. Recent infrastructure investments have included an expanded metro rail link to the city. LAX is especially significant for expats with ties to countries in the Asia-Pacific region.

Chicago — O’Hare International Airport (ORD) functions as a major hub for both American Airlines and United Airlines and serves as the Midwest’s primary junction for domestic and international routes. The CTA Blue Line train offers a direct rail connection to the city centre.

Other key gateways — Miami International (MIA) is the dominant entry point for Latin American and Caribbean routes and ranks as one of the busiest hubs in the Americas. San Francisco International (SFO) anchors the Bay Area technology corridor and serves as a key Pacific hub. Dallas/Fort Worth (DFW), Washington Dulles (IAD), Boston Logan (BOS), Atlanta Hartsfield-Jackson (ATL), and Houston’s George Bush Intercontinental (IAH) all handle substantial international traffic and benefit from strong domestic connections. In summer 2025, American Airlines alone operates more than 70 daily departures to over 20 transatlantic destinations.

For expats arriving in the US for the first time, it is worth researching which gateway airport lies closest to your destination city and which airlines serve your home country nonstop — both factors can significantly influence the cost and convenience of future return trips. The Federal Aviation Administration (FAA) and individual airport authority websites carry current information on routes and facilities.

Are there any rules, restrictions, or practicalities at US airports that expats should be aware of?

While airports in the US are managed by local or regional authorities, security screening falls under federal jurisdiction and is carried out by the Transportation Security Administration (TSA), an agency of the Department of Homeland Security. Familiarity with TSA rules will make the experience of travelling through US airports considerably smoother.

Identification requirements for domestic flights — This is among the most important practical matters for newly arrived residents to understand. From May 7, 2025, state-issued driver’s licences or ID cards that do not meet the REAL ID standard are no longer valid for airport security purposes. Travellers must present either a REAL ID-compliant document or an accepted alternative such as a valid passport. For expats, the simplest solution is to use a current foreign passport — it is fully accepted at TSA checkpoints for any domestic US flight. A REAL ID does not substitute for a passport on international journeys, but a valid passport satisfies the domestic ID requirement entirely.

Starting February 1, 2026, passengers who are unable to present an acceptable form of ID at a TSA checkpoint will have the option to pay a $45 fee to use TSA ConfirmID, a service that will attempt to verify your identity remotely so that security screening can proceed. Always review the TSA’s official identification page before any trip, since the list of accepted documents can change.

Security screening — In July 2025, the TSA eliminated the long-standing requirement to remove shoes at security checkpoints, a change that has been widely welcomed. The 3-1-1 liquid rule remains in effect: passengers may carry liquids in containers no larger than 3.4 ounces, all placed within a single quart-sized transparent bag. At airports that have deployed advanced CT scanning technology — including Atlanta, New York JFK, and Los Angeles LAX — liquids may no longer need to be removed from bags, but until the technology is rolled out more broadly, most airports continue to enforce the standard liquid rule.

Check-in times — For domestic flights, arriving at least 90 minutes before departure is generally considered adequate, though two hours is the safer choice at high-traffic airports or during busy travel periods. International departures call for at least three hours. TSA PreCheck is a trusted traveller programme that enables expedited security screening at more than 200 US airports. Enrolment requires an in-person appointment for fingerprinting and a photograph, costs between $78 and $85 depending on the chosen provider, and approval typically follows within 3–5 days.

Arriving internationally — Anyone entering the US from abroad must pass through US Customs and Border Protection (CBP) and complete international arrivals procedures. Citizens of visa waiver countries need an approved Electronic System for Travel Authorization (ESTA); those travelling on visas must carry the relevant documentation. The US Customs and Border Protection website is the definitive source for rules on what may be brought into the country — restrictions on food, plants, and certain other items can catch arriving expats off guard if not checked in advance.

How does air travel connectivity in the US affect day-to-day expat life?

Expats settling in major metropolitan areas — New York, Los Angeles, Chicago, Miami, San Francisco, Seattle, or Houston — will find air connectivity to be a genuine strength. Large hub airports bring a wide variety of international routes within reach, making visits back to home countries relatively manageable, while frequent domestic services allow easy movement around the country at competitive prices.

Those relocating to mid-sized cities are also generally well served. Denver, Phoenix, Dallas, Boston, Philadelphia, Washington D.C., and Atlanta all function either as major hubs in their own right or as well-connected secondary airports with strong domestic networks and meaningful international route options. The Atlanta–Orlando corridor alone had 3.23 million seats scheduled in 2025, reflecting the sustained demand between two of the country’s most significant travel markets and Atlanta’s standing as the largest hub in the United States.

The picture changes for expats who choose to settle in smaller or more rural communities. Regional airports in these areas may be served by only one or two carriers, often operating through a connecting hub on smaller regional jets rather than mainline aircraft. Limited competition typically pushes fares higher, schedules are less frequent, and nonstop travel becomes the exception rather than the rule. In the most remote parts of Alaska, aviation is not merely the most convenient transport option — it is often the only one available, in all weather and across all seasons.

For expats who travel internationally with any regularity — for work, family visits, or both — it is worth thinking carefully about proximity to a major hub airport when choosing where to live. Being located near a hub dramatically extends the range of nonstop international routes available and generally reduces the time and expense of long-haul journeys. Those based in smaller markets may need to factor in a connecting flight or a significant drive to reach an international gateway on every overseas trip.

Within the continental US, flying becomes the most practical way to travel for distances beyond roughly 400–500 km. Shorter journeys may be better served by the interstate highway network, which is extensive and well-maintained, or — in the Northeast corridor between cities such as Boston, New York, Philadelphia, and Washington D.C. — by Amtrak rail. Unlike countries where domestic aviation is bolstered by government subsidy or where high-speed rail absorbs medium-distance travel demand, the US relies on a commercially driven, market-based aviation sector to hold its far-flung regions together.

What should expats know about travel insurance and passenger rights when flying in the US?

Passenger protections in the US are overseen by the US Department of Transportation (DOT) and differ in important ways from frameworks such as the European Union’s Regulation 261/2004, which entitles passengers to fixed financial compensation for qualifying delays and cancellations within EU jurisdiction.

Under current US DOT rules, airlines must provide refunds when they cancel a flight or make a significant change that the passenger declines to accept. A significant change is defined to include departure or arrival time shifts of more than three hours on domestic routes and more than six hours on international routes, as well as changes to the departure or arrival airport, an increase in the number of connections, a downgrade in cabin class, or accessibility problems affecting travellers with disabilities. Additional compensation obligations apply when significantly delayed baggage is returned or when paid-for services such as Wi-Fi are not provided.

A crucial distinction from European rules is that US DOT regulations do not require airlines to pay fixed cash compensation simply because a flight is delayed — passengers are generally entitled to a refund only when they choose not to travel following a cancellation or significant change. Some airlines do voluntarily provide meal vouchers or hotel accommodation for lengthy disruptions or overnight delays, but this is left to the airline’s discretion unless it forms part of their published customer service commitments. Consumer protection provisions in this area are subject to ongoing regulatory debate, with the DOT having paused enforcement on certain refund specifics until mid-2026. The most reliable way to stay current is to check the DOT’s rules directly at transportation.gov/airconsumer before travelling.

Where a passenger is involuntarily denied boarding because the airline has oversold the flight, US rules do mandate compensation. The amount is calculated based on the length of the resulting delay and the one-way fare paid, and can range from 200% to 400% of that fare, subject to a maximum figure set by the DOT. Check the DOT website for current maximum amounts, as these are updated periodically.

Given that mandatory protections are more limited in the US than in some other markets, travel insurance is strongly advisable for expats — for both domestic and international journeys. A comprehensive policy should address trip cancellation, medical emergencies (healthcare costs in the US without insurance can be severe), delayed or lost baggage, and travel disruption. Reputable international insurers and specialist expat insurance providers offer policies designed for people living outside their home country. As always, reading the policy terms carefully — particularly any clauses relating to pre-existing medical conditions — is essential before purchasing.

Step-by-step: How to book a domestic flight in the US

1. Choose your route and dates. Use a comparison tool such as Google Flights or Kayak to get an overview of available airlines, fares, and schedules between your origin and destination airports. Check Southwest Airlines’ website separately, as its fares do not appear on third-party platforms.
2. Compare total costs, not just base fares. Check baggage fees, seat selection charges, and any other add-ons, especially on low-cost and ultra-low-cost carriers. A low base fare can become more expensive than a legacy carrier once extras are added.
3. Select your airline and fare class. Decide whether flexibility matters to you — some cheap fares are non-refundable and have change fees. If your travel dates might shift, a more flexible fare or a carrier with no-change-fee policies may be worth the extra cost.
4. Book directly through the airline’s website or app, or via a trusted third-party platform. Booking directly with the airline can simplify rebooking or customer service if problems arise. Enter your name exactly as it appears on the ID or passport you plan to use at security.
5. Check your identification requirements. As an expat, ensure you carry a valid passport or REAL ID-compliant identification for domestic flights. Your foreign passport is fully acceptable for all domestic US flights.
6. Manage your booking: add bags, seat selection, and any extras. Do this in advance — adding bags at the airport gate is typically much more expensive than doing so online before travel.
7. Check in online. Most US airlines allow online check-in from 24 hours before departure (some up to 48 hours). Checking in online and downloading your boarding pass to your phone avoids queues at the airport check-in desk.
8. Arrive at the airport with sufficient time. Allow at least 90 minutes before domestic departures at smaller airports, and at least two hours at major hubs, especially during peak periods. International departures require at least three hours.

Frequently Asked Questions

Can I use my foreign passport to fly on domestic US flights?

Yes. A valid foreign passport is fully accepted as identification at TSA security checkpoints for any domestic flight within the United States. For expats, this is the most hassle-free identification option until a REAL ID-compliant state driver’s licence or ID card has been obtained. Make sure your passport remains current and has not expired — while TSA may accept certain expired US-issued documents up to two years after expiry, a foreign passport must be valid.

What is REAL ID and do I as an expat need one?

REAL ID is a federal security standard applied to state-issued driver’s licences and identification cards. Since May 7, 2025, a REAL ID-compliant document or an accepted alternative — including a valid passport — is required to board domestic flights. As an expat, your valid foreign passport satisfies this requirement, meaning there is no obligation to obtain a REAL ID. If you do acquire a US state driver’s licence as a resident, however, it is sensible to ensure it meets the REAL ID standard for everyday convenience.

How far in advance should I book domestic flights in the US?

On most popular routes, booking roughly four to eight weeks ahead tends to yield the best available fares. For travel during high-demand periods — including Thanksgiving, Christmas, New Year, and summer school holidays — it is wise to plan even further ahead, ideally two to three months in advance, as prices rise steeply and seats become scarce. While last-minute bargains do occasionally surface on certain routes, counting on them for time-sensitive travel is not reliable.

Are budget airlines in the US actually cheaper once fees are included?

Not always. Ultra-low-cost carriers such as Frontier, Spirit, and Allegiant headline with very low base fares but attach separate charges to carry-on bags, seat selection, and virtually every other service. Even the Big Three legacy carriers — American, Delta, and United — collectively brought in $3.9 billion in checked baggage fees in 2024, demonstrating that ancillary charges are a market-wide reality. Before concluding which airline offers the best deal, always calculate the full cost inclusive of the bags and seat preferences relevant to your trip.

Is flying the best way to get around the US, or are road and rail alternatives worth considering?

The right answer depends on both distance and location. For any journey exceeding roughly 400–500 km, flying is almost invariably the fastest and most practical choice. On shorter trips — particularly along the Northeast corridor between Boston, New York, Philadelphia, and Washington D.C. — Amtrak’s Acela service can be genuinely competitive once total airport travel time is factored in. Driving is widely preferred for medium-distance trips, especially where air service is limited. In Hawaii and Alaska, flying is simply unavoidable for inter-island travel and for reaching remote communities.

What are my rights if my domestic US flight is cancelled or significantly delayed?

Under US DOT rules, if your airline cancels a flight or introduces a significant change — such as shifting the departure time by more than three hours on a domestic service — and you opt not to accept the revised itinerary, you are entitled to a full refund. This differs fundamentally from the EU261/2004 system, which mandates fixed monetary compensation for qualifying delays. In the US, there is no automatic cash payment simply for a delay; refunds apply when passengers choose not to travel following a cancellation or significant change. For the most current details, consult the US DOT’s Air Consumer website, as the precise scope of enforcement continues to evolve.

Which US airports have the best international connections for expats wanting to travel home?

New York JFK offers the broadest selection of international destinations, with particularly strong coverage of transatlantic routes to Europe, Africa, and the Middle East. Los Angeles LAX is the primary gateway to Asia, Oceania, and Latin America from the Pacific side. Miami MIA dominates routes to Latin America and the Caribbean. Chicago O’Hare, Dallas/Fort Worth, San Francisco, and Washington Dulles are also significant international hubs. The airport that matters most to you will depend on your home country and where in the US you are based.

Do I need travel insurance for domestic flights within the US?

It is strongly advisable. The US lacks a comprehensive mandatory compensation system for flight delays, and if a medical emergency arises during travel, out-of-pocket healthcare costs without insurance can be extraordinarily high. A solid travel insurance policy covering trip cancellation, medical emergencies, and baggage loss offers important financial protection. Expats are particularly well served by specialist international health and travel insurance products designed for people living abroad, which typically deliver better value than standard single-trip policies.