Cheap flights from Washington to London from $255

The cheapest month to fly to London from State of Washington is in January. Flight prices, which tend to average around $653, are often lower during this time because this is during the off-season. The month of November is another great option to travel to London, with average flight prices from State of Washington averaging around $676.

The cheapest day to depart from State of Washington to London is on a Wednesday. Travelers who choose to depart for London on a Wednesday will often find tickets for as low as $874. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $965. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

Flying to London from State of Washington in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $908 when looking at flights departing in the afternoon. Flights to London are more costly in the evening, with an average ticket price of $931. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

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

You are more likely to see cheaper flights to London from State of Washington when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around $849 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from State of Washington for as low as $747 on momondo.

There are 4 cabin classes available to choose from on State of Washington to London flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Icelandair, British Airways, and Lufthansa are the most popular carriers operating from Washington to London

Delta, British Airways and Virgin Atlantic are the top three most popular airlines that fly to London from State of Washington according to our data. Delta is the first choice among our users, with 32% of people opting to fly with this airline when traveling to London. Keep in mind that there are 13 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

The number of flights available between State of Washington and London is 29 per day as of August 2026. The most frequent departure time is 1:00PM, with 71% of daily flights leaving in the evening.

The number of flights available between State of Washington and London is 208 per week as of August 2026. The most frequent departure day is Tue, with 15% of weekly flights leaving on this day.