Cheap flights from London to Washington from £383

If you aren’t able to travel to State of Washington during the month of February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of £501.

The cheapest day to depart from London to State of Washington is on a Thursday. Travellers who choose to depart for State of Washington on a Thursday will often find tickets for as low as £600. 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 State of Washington on Sunday is £678.

Flying to State of Washington from London at midday is the least expensive time of day to depart. momondo users have found prices as low as £585 when looking at flights departing at midday. In contrast, the most expensive time of day to depart to State of Washington is in the morning when prices are around £632.

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

You are more likely to see cheaper flights to State of Washington from London when booking weeks ahead of your departure date. In general, you can expect to find flights to State of Washington for around £583 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to State of Washington from London for as low as £523 on momondo.

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

SWISS, British Airways, and Alaska Airlines are the most popular carriers operating from London to Washington

Virgin Atlantic, British Airways and Alaska Airlines are the top three most popular airlines that fly to State of Washington from London according to our data. Virgin Atlantic is the first choice among our users, with 53% of people opting to fly with this airline when travelling to State of Washington. Keep in mind that there are 12 different airlines that fly to State of Washington on a routine basis, so you have a few additional options to choose from.

The number of flights available between London and State of Washington is 29 per day as of August 2026. The most frequent departure time is 09:00, with 52% of daily flights leaving in the afternoon.

The number of flights available between London and State of Washington is 209 per week as of August 2026. The most frequent departure day is Tue, with 15% of weekly flights leaving on this day.