Compare 30+ airlines and booking sites in one search and grab the lowest fare to London, UK — including last-minute deals.
London is loved for history, theatre and world-class museums — and it's one of the most-searched trips of the year, so fares swing a lot. The trick isn't loyalty to one site: the cheapest seat to London (LON) hides on a different site every day. AllInOneTrip fires your exact trip into Google Flights, Skyscanner, Kayak, Momondo, Expedia and Aviasales at once, so you see who's cheapest in seconds instead of checking ten tabs.
Shifting your dates a few days around a weekend can cut fares to London dramatically.
Tuesday–Thursday departures are typically cheaper than Friday–Sunday.
Open all sites together — the same flight is often priced differently across them.
Midweek departures (Tuesday–Thursday) and booking 4–8 weeks ahead usually return the lowest fares to London. Use the search above to compare 30+ sites at once and spot the cheapest day.
Set flexible dates and compare Google Flights, Skyscanner, Kayak and Aviasales together — last-minute drops appear on different sites, so searching them side by side is how you catch them.
London's main airport code is LON. Our search checks nearby airports automatically on most partner sites so you never miss a cheaper option.