Cheap flights from London to Seattle from €397

If you’re not able to fly to Seattle in February, then January is your next best option. Flight prices from London to Seattle during January average around €576.

Fly from London Heathrow to Seattle/Tacoma Intl for the best London - Seattle/Tacoma Intl flight prices

You are more likely to see cheaper flights to Seattle from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around €662 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from London for as low as €620 on momondo.

There are 2 cabin classes available to choose from on London to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 71% on your flight if you consider stops on a London to Seattle flight.

As of March 2026, prices for London to Seattle flights are approximately 1% more expensive when compared to flights at the same time last year.

Historically, on average around 11% of flights between London and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 126 minutes.

Generally, flights departing in the evening tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

Thursday is statistically the day of the week that experiences the fewest delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

According to our data, Delta have had the fewest delays on this route over the last 12 months, with about 6% of their flights experiencing any sort of delay.

13 flights are operational daily from London to Seattle as of March 2026. The most popular departure time for this route is 12:00, with 78% of flights per day taking off in the afternoon.

As of March 2026, there are 97 flights per week flying from London to Seattle. The most common day of the week flights depart is Sat, with 21% of flights taking off on this day.