Cheap flights to London (LHR)

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Why fly to London?

For most Americans, London is the gateway to Europe — and an easy one, since there's no language barrier, the city is endlessly walkable, and the JFK-to-Heathrow corridor is the busiest transatlantic route in the world, which keeps fares competitive year-round. You can pack a first trip with the icons: Big Ben and the Houses of Parliament, the Tower of London, Buckingham Palace, and a slow loop on the London Eye. But the city rewards wandering — the free national museums (the British Museum, the Tate Modern, the National Gallery all cost nothing to enter), the markets at Borough and Camden, and the green sprawl of Hyde Park. The Underground gets you anywhere fast on a contactless tap of your U.S. credit card, no separate ticket needed. London is also a perfect hub: cheap budget-airline flights and the Eurostar train fan out to Paris, Amsterdam, and beyond, so many travelers use it as the first stop on a multi-city European trip.

Best months to fly to London

January through March and the back half of fall (late October into early December, excluding the Christmas rush) bring the lowest transatlantic fares — peak summer is the most expensive and crowded, so shoulder-season trips save the most while the city stays lively.

FAQs: cheap flights to London

When are flights from the U.S. to London cheapest?
Winter (January through March) and late fall outside the holidays typically offer the lowest fares. Summer is peak season with the highest prices, so flying in the shoulder months saves money while crowds thin and the city stays fully open.
How long is the flight to London from the U.S.?
Roughly 6.5 to 7 hours nonstop from New York-area airports, about 8 hours from Chicago, and 10 to 11 hours from the West Coast. The JFK-Heathrow route is the world's busiest transatlantic corridor, so nonstops are frequent.
Do I need anything besides a passport to enter the UK?
U.S. citizens need a valid passport and now an approved ETA (Electronic Travel Authorization), which you apply for online before you travel. It's quick and inexpensive, but don't skip it — confirm the current requirement before booking.
Will my U.S. credit card work on the London Underground?
Yes. You can tap a contactless U.S. credit card or phone directly at the gates on the Tube, buses, and most trains — no need to buy a separate Oyster card. Daily fare caps apply automatically, so you won't overpay.
Is London a good base for visiting the rest of Europe?
Excellent. Budget airlines and the Eurostar train connect London to Paris, Amsterdam, Dublin, and dozens of cities, often cheaply. Many U.S. travelers fly into London, explore, then continue to other European destinations on a single trip.

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Flight tips & guides

Practical advice for booking cheap flights to London and beyond.