Cheap Flights from London to Seattle from $550

Frequently Asked Questions

• What are the cheapest flights from London to Seattle (LON-SEA)?

  Based on Trip.com data, American Airlines offers one-way fares as low as $550 on Cheapest nonstop routes (e.g. LHR to SEA on Mon, Aug 3), while Icelandair offers Cheapest nonstop round-trips from $521 departing on Thu, Jun 25 and returning on Tue, Jun 30.

• Which airlines offer direct flights from London to Seattle?

  At the moment, you can catch a nonstop flight from London to Seattle with the following airlines, including: Alaska Airlines British Airways Virgin Atlantic Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

• How long does it take to fly from London (LON) to Seattle (SEA) and what is the distance?

  It takes around 10 hours 4 minutes to fly from London (LON) to Seattle (SEA).

• When is the best time to book flights from London to Seattle?

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from London to Seattle is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

• How many flights are there per week from London to Seattle?

  Based on Trip.com data in the past 4 weeks, there is 30 flight per week flying from London to Seattle. You can check the weekly schedule for popular airlines on this route below: Alaska Airlines: S/M/T/W/T/F/S -- AS5269 (10:14) British Airways: S/M/T/W/T/F/S -- BA053 (10:14)

• How can I find the best deals on flights from London to Seattle?

  To find best deals on flights from London to Seattle, you can use various tools on Trip.com:
  · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Mon, Aug 3, with one-way flights priced at just $550.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is British Airways.
  · Set up price alerts to easily monitor ticket prices without having to check every day.
  · Check Trip.com flight deals and promo codes frequently.
  · Avoid peak season unless you book very early. It seems the peak season for Seattle travel is around July.
  · Get exclusive promo codes for Trip.com app users.

• When are flight tickets from London (LON) to Seattle (SEA) the cheapest?

  The cheapest months to fly from London to Seattle is September, when demand for travel is lower.

• Which upcoming date is cheapest to fly from London to Seattle on?

  After crunching the numbers on our June flight calendar, it's currently cheapest to fly from London to Seattle on June 19, 2026 with Icelandair, with prices starting at $527.

• Which airports can I fly to for Seattle from London?

  You can land at any one of the following hubs in Seattle, with Heathrow Airport to Seattle-Tacoma International Airport (LHR-SEA) is by far the most common option on this route: Seattle-Tacoma International Airport (SEA) King County (Boeing Field) International Airport (BFI) Kenmore Air Harbor Seaplane Base (LKE).

• Is there any time difference between London and Seattle?

  The time difference between Seattle and London is 8h.

• How do I change or cancel my ticket from London to Seattle?

  Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.