London is one of the best-connected cities in the world, with more flights between North America and Europe than almost anywhere else. That competition, spread across several airports, makes London a good place to look for cheap airfare to Europe.
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From Heathrow, the Heathrow Express, the Elizabeth line and the Piccadilly line (Underground) run into central London. From Gatwick, the Gatwick Express, Thameslink and Southern trains go into the city. Stansted and Luton have train links and coaches, and London City is on the DLR. Taxis are available at all airports.
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Fares to London are often lower from November to March (outside Christmas and New Year) and in the shoulder seasons. Summer and school holidays tend to be the most expensive.
Heathrow (LHR) has the most long-haul flights and good rail links. Gatwick (LGW) is a strong alternative, while Stansted and Luton are used mainly by low-cost European airlines.
The Heathrow Express to Paddington is the fastest; the Elizabeth line and Piccadilly line are other rail options.
Winter outside the holidays and the spring and autumn shoulder seasons generally have better fares than summer.