Cheap flights from Seattle to London

Looking for cheap flights from Seattle to London? We track round-trip fares from SEA to LHR around the clock and post the sharpest price drops here first. London has nonstop service from Seattle, and sale fares on this route tend to disappear within a day or two. Create a free account to see full deal details, or go Premium for an email alert the moment a London fare drops.

A trip from Seattle to London is a journey into history and culture, where iconic sights like Big Ben and the Houses of Parliament come alive, especially at dusk when the skyline is beautifully illuminated. The best times to visit London are during the shoulder seasons of spring and fall, when the weather is mild and crowds are smaller, making it easier to explore the city's rich offerings. This is also when you can find the best opportunities for cheap flights from Seattle to London, as airlines often offer promotions to fill seats ahead of the peak summer travel season.

Traveling from SEA to LHR is convenient, thanks to nonstop service that connects these two vibrant cities efficiently. When planning your trip, aim to book your flight deals several months in advance to secure the best rates. Typically, the best time to look for sale fares is around three to six months before your departure, giving you a good chance of finding competitive prices for this sought-after route.