Cheap flights from London Heathrow Airport to Washington from £388

If you aren’t able to travel to State of Washington during the month of January, then flying in February is also cheap. Prices for this month can be found on momondo for an average of £503.

The cheapest day to depart from London Heathrow Airport 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 £591. 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 £652.

Flying to State of Washington from London Heathrow Airport at midday is the least expensive time of day to depart. momondo users have found prices as low as £526 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 £640.

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

You are more likely to see cheaper flights to State of Washington from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to State of Washington for around £587 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 Heathrow Airport for as low as £552 on momondo.

There are 4 cabin classes available to choose from on London Heathrow Airport 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.

KLM and United Airlines are the most popular carriers operating from London Heathrow to Washington

Virgin Atlantic, British Airways and Alaska Airlines are the top three most popular airlines that fly to State of Washington from London Heathrow Airport according to our data. Virgin Atlantic is the first choice among our users, with 50% 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.

As of October 2026, 9 flights take off from London Heathrow Airport and land in State of Washington each day. The most common flight departure time for this route is 17:00, with 54% of daily flights taking off in the afternoon.

As of October 2026, 63 flights take off from London Heathrow Airport and land in State of Washington each week. The most common flight departure day for this route is Thu, with 30% of weekly flights taking off on this day.