Cheap flights from London to Washington from $519

The month of February is, on average, the cheapest month to fly to State of Washington from London, with most prices found around $664. 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 $676.

The cheapest day to depart from London to State of Washington is on a Monday. Travelers who choose to depart for State of Washington on a Monday will often find tickets for as low as $802. When flying out on a Friday, the most expensive travel day of the week, you can expect to see flight prices from London to State of Washington for around $954.

The cheapest time of day to fly to State of Washington is at noon when flights can be purchased for as low as $841. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $926 on average. Flights to State of Washington from London in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.

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 $791 when searching weeks out. 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 $706 on momondo.

There are 3 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.

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

British Airways, Virgin Atlantic and Delta are the top three most popular airlines that fly to State of Washington from London according to our data. British Airways is the first choice among our users, with 35% of people opting to fly with this airline when traveling to State of Washington. Keep in mind that there are 7 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 26 per day as of August 2026. The most frequent departure time is 9:00AM, with 51% of daily flights leaving in the afternoon.

The number of flights available between London and State of Washington is 184 per week as of August 2026. The most frequent departure day is Mon, with 17% of weekly flights leaving on this day.