Cheap Flights to London from the US: Airports, Airlines and When to Book

Why London stays at the top of the list

Kayak's 2026 summer research names London among the most-searched destinations for US travelers, alongside Orlando and Las Vegas. It is easy to see why. The language is familiar, flights are frequent from almost every major US city, and the city itself combines history, theatre, food and museums that suit nearly every type of traveler.

That popularity has a practical benefit. With so many airlines competing on the route, there are fare sales, seasonal promotions and different routes to compare. The challenge is knowing where to look, and that begins with understanding London's airports.

London's airports: which one to choose

London has several major airports. Heathrow (LHR) is the largest and best connected, with the widest range of nonstop flights and the Elizabeth line and Heathrow Express to the centre. Gatwick (LGW) is the second-largest, with many transatlantic routes and a fast train to central London. Others, such as Stansted and Luton, serve mostly low-cost carriers.

Heathrow is usually the most convenient but sometimes costs more. Gatwick can offer lower fares on some routes. Our Heathrow airport guide explains the terminals and transport links. Compare the fare difference with the cost and time of reaching the city from each airport.

Nonstop routes and flight times

Nonstop flights to London run from many US cities, including New York, Boston, Chicago, Atlanta, Miami, Los Angeles, San Francisco, Dallas, Houston and Washington. Flights take around 6.5 to 7.5 hours from the East Coast and 10 to 11 hours from the West Coast, with the return usually a little longer.

Our route guides cover many common starting points, including New York to London, Boston to London, Los Angeles to London and Miami to London. Connecting itineraries can be cheaper from smaller cities, though they add time.

Airlines serving the route

A large number of airlines fly to London, including British Airways, Virgin Atlantic, American, Delta, United and others. Each has different baggage rules, seat pitch and onboard service, so compare more than price. Joint ventures between airlines can also affect schedules and connecting options.

Read about British Airways, American Airlines and Delta Air Lines on our airline pages. For travelers who want extra comfort, our New York to London business class guide compares the premium cabins.

A sample five-day London plan

A relaxed first visit might begin with a gentle first day, after the overnight flight, with a walk along the Thames and a pub dinner. Day two can cover the major sights around Westminster, with the Houses of Parliament and Westminster Abbey, followed by a theatre evening in the West End. Day three might be museums, many of which are free, and a stroll through Covent Garden.

Day four could cover Greenwich or Kew Gardens, and day five a market visit and afternoon tea before your flight. London rewards slow exploration more than a checklist, so leave room for wandering. If you have longer, add day trips to Oxford, Bath or Cambridge, all reachable by train.

When fares are cheapest

Fares to London usually peak in summer, around Christmas and during major events. The cheapest periods tend to be January to March, and autumn outside school holidays, with November and early December being quiet apart from US Thanksgiving week.

Midweek flights are usually cheaper than weekend departures, and shoulder seasons offer a good balance of weather and price. Our guide to the best time to book flights in 2026 explains general patterns, and a price alert helps you act when the fare drops.

How far ahead to book

For transatlantic flights, two to six months ahead is a sensible window, and earlier for summer and holidays. Fares do not usually fall at the last minute, particularly on busy routes, so waiting rarely pays off for London.

Our guide to how far in advance to book international flights gives more detail, and our article on tracking fare drops shows how to set alerts. If you see a fair fare for your dates, it is often worth booking.

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Entry requirements for US citizens

US citizens need a valid passport to visit the UK, and a UK electronic travel authorisation is now required before travel for visa-exempt visitors. Apply through the official government site, and allow time in case of delays. The authorisation is linked to your passport, and a small fee applies.

Requirements can change, so check the official UK government website close to your departure date. Also check your passport's validity, because it should cover your stay. If you are travelling with children, each person needs their own authorisation.

Basic fares, bags and seats

Transatlantic basic fares can look attractive but often charge for seat selection and checked bags, and offer little flexibility. For a trip of a week or more, a standard fare is usually better value, particularly for families who want to sit together.

Our comparison of basic economy and standard economy shows where the differences lie. Pack within the limits using our guide to carry-on size rules. A cheap fare is only cheap if the total cost works.

Getting from the airport to the city

From Heathrow, the Elizabeth line and Heathrow Express reach central London quickly, and the Underground's Piccadilly line is the cheapest option. From Gatwick, the Gatwick Express and other trains connect to central stations in about 30 to 45 minutes.

Taxis and private transfers are convenient but more expensive, particularly in rush hour. Our airport transfers service can arrange pre-booked rides. Choose public transport if you travel light and the private option if you have a lot of luggage or arrive late.

Where to stay and what to do

London is large, and where you stay affects your trip. Central areas such as Covent Garden, Westminster and Southbank are convenient for sights, while neighbourhoods like Shoreditch and Notting Hill offer a local feel. Hotel prices vary widely, so compare options.

Our London guide covers neighbourhoods and highlights, and our London hotels guide helps you choose where to stay. Booking flights and a hotel together can sometimes save money, so compare a package with separate bookings.

London on a sensible budget

London has a reputation for being expensive, but some of its best experiences are free. Major museums such as the British Museum and the National Gallery do not charge for entry, and parks, markets and walks cost nothing. Contactless payment on public transport caps daily fares, so you never overpay.

You can save on food by eating your main meal at lunch, trying pubs and markets, and choosing neighbourhood restaurants instead of tourist-heavy streets. Off-peak travel on trains is cheaper, and booking attractions in advance often saves money. With a reasonable airfare, London can fit a wide range of budgets.

Combining London with other destinations

London is a gateway to the rest of Europe. Trains connect to Paris in around two hours and a half, and low-cost airlines fly to dozens of European cities. Open-jaw tickets, flying into London and home from another city, often cost little more than a round trip.

Our guide to multi-city versus round-trip tickets explains how to compare options, and our article on the stopover strategy shows how to add a second city. A short flight within Europe can open up great value.

Theatre, sports and event dates

Major events, such as big concerts, sporting fixtures and festivals, push hotel and flight prices up. Check what is on during your dates, particularly if you want to attend a particular show or match, since popular events sell out months in advance.

If you are flexible, avoid peak event weekends. If you cannot, book flights and accommodation early. Our festival travel service can help with trips built around events.

Money and tipping

The pound sterling is the local currency. Cards, including contactless payments, are accepted almost everywhere, so you need little cash. Choose to be charged in pounds when paying by card to avoid poor conversion rates.

Tipping in restaurants is usually around 10 to 12.5 percent, and often included as a service charge. In pubs, you typically order and pay at the bar without tipping. A card without foreign transaction fees can save money.

Day trips and how the flights fit

London makes a good base for day trips. Oxford, Cambridge, Windsor, Bath and Canterbury are all within a short train ride, and the trains are frequent and easy to book. Many visitors find that they can see several of them without needing to move hotels.

If you are planning an itinerary that includes several cities, consider flying into London and out of another city, or the reverse. This can save a day of backtracking. Our specialists can price open-jaw tickets alongside standard round trips so you can compare the options.

Protecting your trip

Transatlantic trips are a big investment, so protect them. Choose a fare with sensible change rules, consider travel protection and avoid very tight connections. Keep important items in your carry-on and allow buffer time.

Our guide to delay and cancellation rights explains what to ask for if something goes wrong. Check your passport and electronic travel authorisation before you fly, since a missing document is far harder to fix at the airport.

Jet lag and the first day

London is five hours ahead of the US East Coast, and eight ahead of the West Coast. Overnight flights from the East Coast arrive in the morning, so aim to stay awake until local evening, get daylight and keep the first day gentle.

Our guide to long-haul flight comfort and jet lag offers practical tips. A short walk in the afternoon sun is one of the best ways to reset your body clock.

How we can help

If you would like help finding cheap flights to London, speak to a specialist. We can compare airports, airlines and routes, and suggest the best dates for your plans. We can also help you build a package with a hotel and transfers.

You can also check live fares below. With so many airlines competing, a little flexibility and early searching can often turn up a better fare than you might expect.

Before you pay: two quick checks

First, confirm that the name on your booking matches your passport exactly, because corrections can be costly. Second, check that your passport is valid for your whole stay and that you have applied for the UK travel authorisation. Both take only a few minutes, and both prevent problems that are far harder to fix at the airport than at your kitchen table.

Mistakes first-time visitors often make

Common errors include booking a hotel far from public transport to save a little, underestimating how long journeys across London take, and forgetting that the UK electronic travel authorisation must be arranged before you fly. Another is trying to see too much in a short stay.

Some travelers also forget that restaurants and theatres need booking in advance, or assume taxis are the only way from the airport. A short checklist before you leave covers most of these points, and avoids stress when you arrive.

A last word on booking London flights

London is a route where small decisions add up. Choosing the right airport, avoiding a peak date by a day or two, and picking a fare with the baggage you actually need can easily outweigh a headline price difference. Compare the full cost, check your travel authorisation early, and book when you see a fare you are happy with rather than waiting for a perfect one.

If you would like help weighing the options, our specialists search daily and can often find combinations that a standard search page misses.

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Good to know

Frequently Asked Questions

Common questions travelers ask before booking.

Is London one of the most popular destinations for US travelers?

Yes. Kayak's 2026 summer research names London among the most-searched destinations for US travelers, alongside Orlando and Las Vegas.

Which London airport is cheapest to fly into?

It varies. Heathrow has the most nonstop routes and best transport links, while Gatwick can be cheaper on some routes. Compare fares and the cost of reaching the city.

How long is the flight from the US to London?

Around 6.5 to 7.5 hours from the East Coast and 10 to 11 hours from the West Coast.

When is the cheapest time to fly to London?

January to March and autumn outside school holidays are usually cheaper than summer and Christmas. Midweek flights tend to be cheaper than weekends.

How far ahead should I book London flights?

Two to six months ahead is a sensible window, and earlier for summer and holidays. Last-minute fares rarely fall on busy routes.

Do US citizens need anything besides a passport for the UK?

Yes. A UK electronic travel authorisation is now required for visa-exempt visitors before travel. Apply through the official government site and check requirements close to your trip.

Is it cheaper to book a package with a hotel?

Sometimes. Packages can offer good value, but it is worth comparing the total cost with booking flights and a hotel separately.

How do I get from Heathrow to central London?

The Elizabeth line, Heathrow Express and the Piccadilly line all connect to central London. Taxis and private transfers are available too.

Cheap Flights to London from the US