Cheap flights from the United Kingdom to Seattle from £261

The cheapest month to fly to Seattle from United Kingdom is in February. Flight prices, which tend to average around £292, are often lower during this time because this is during the off-season. The month of January is another great option to travel to Seattle, with average flight prices from United Kingdom averaging around £298.

According to our data, Thursday is the cheapest day to fly to Seattle from United Kingdom. The lowest ticket price found for a Thursday departure recently was £604. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to Seattle on Sunday is £683.

According to our data, the cheapest time of day to fly to Seattle is at midday. momondo users have found flights departing from United Kingdom to Seattle at midday for as low as £610. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the afternoon are often more expensive, with an average ticket price of £640.

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

You are more likely to see cheaper flights to Seattle from United Kingdom when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around £586 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 United Kingdom for as low as £527 on momondo.

SWISS, Alaska Airlines, and Aer Lingus are the most popular carriers operating from United Kingdom to Seattle/Tacoma Intl

Virgin Atlantic, British Airways and Icelandair are the top three most popular airlines that fly to Seattle from United Kingdom according to our data. Virgin Atlantic is the first choice among our users, with 40% of people opting to fly with this airline when travelling to Seattle. Keep in mind that there are 14 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

Historically, on average around 10% of flights between United Kingdom and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 117 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. Friday 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 5% of their flights experiencing any sort of delay.

As of May 2026, 20 flights take off from United Kingdom and land in Seattle each day. The most common flight departure time for this route is 09:00, with 50% of daily flights taking off in the afternoon.

142 flights are operational weekly from United Kingdom to Seattle as of May 2026. The most popular departure day for this route is Mon, with 15% of flights per week taking off on this day.