We've gone through lots of different flights, to help you find the cheapest way to get from London Heathrow to Seattle. You can choose from 15 airlines. At the moment, 03 / Oct / 2025 is the cheapest date to travel, but scroll through the results to find the option that works best for you.
The most popular airlines offering flights to Seattle are British Airways, Virgin Atlantic & Air Canada. British Airways is the most popular one, but that doesn’t mean their flights will be the cheapest. If you can't find a flight time that suits you, why not look at flying out from a different airport?
Generally speaking, the flight from London Heathrow to Seattle takes around 15 hrs 10 mins. The fastest flight takes 9 hrs 45 mins to cover the 7692 km distance. You can view all flight times yourself in the results list.
January is normally the cheapest month to fly to Seattle, but it’s important to try different options when you search. Searching by month, for instance, will show you the best time of the week to fly. August is always the most expensive time to fly but, if you check regularly and book early, you have a better chance of getting a good deal.
