What’s the cost of a flight from London to Seattle?

Prices vary based on date, airline, and availability. Compare several options if you're flying between London and Seattle.

Choose a date to explore the best fares now.

If possible, avoid holiday periods: ticket prices tend to rise quickly and availability drops, especially on busy routes. Morning and evening flights are often in high demand too — book early to get a good fare.

Which airports serve London and Seattle?

When planning a trip of about 3221 km, it's a good idea to check flights from surrounding airports too.

• Airports in London: London is the only operational airport in the area.
• Airports in Seattle: Seattle offers flights from 2 airports - Boeing Field, Lake Union.

The closest airport isn’t always the cheapest — it’s worth checking the alternatives too. In some cities, smaller airports offer lower fares than the main ones.

Adjust your flight filters for London – Seattle

Jetcost gives you tools to search smarter. Pick your ideal price range, airline, departure time, and flight type — then compare offers from the best travel agencies and carriers.

Other popular destinations

Planning a trip to United States? These cities are popular too: Las Vegas, Los Angeles, Miami, New York City, Orlando.

Sorting options let you see the most affordable flights first. Some results may include extra fees shown only at checkout — always read carefully to see what’s included.