Cheap Flights from Seattle (SEA) to London (LON)

Frequently Asked Questions

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

  Based on Trip.com data, Hawaiian Airlines offers one-way fares as low as US$265 on Cheapest nonstop routes (e.g. SEA to LGW on Sun, Mar 29), while Icelandair offers Cheapest nonstop round-trips from US$546 departing on Tue, Mar 10 and returning on Tue, Mar 17.

• Which airlines offer direct flights from Seattle to London?

  At the moment, you can catch a nonstop flight from Seattle to London with the following airlines, including: Air France 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 is a flight from Seattle to London?

  It takes about 9 hours 40 minutes to fly from Seattle to London.

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

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Seattle to London 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 Seattle to London?

  Based on Trip.com data in the past 4 weeks, there is 16 flight per week flying from Seattle to London. You can check the weekly schedule for popular airlines on this route below: Virgin Atlantic: S/M/T/W/T/F/S -- VS4037 (17:21)

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

  To find best deals on flights from Seattle to London, 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 Sun, Mar 29, with one-way flights priced at just US$265.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Virgin Atlantic.
  · 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 London travel is around July.
  · Get exclusive promo codes for Trip.com app users.

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

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

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

  After crunching the numbers on our February flight calendar, it's currently cheapest to fly from Seattle to London on February 24, 2026 with Hawaiian Airlines, with prices starting at US$235.

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

  You can land at any one of the following hubs in London, with Seattle-Tacoma International Airport to Heathrow Airport (SEA-LHR) is by far the most common option on this route: London City Airport (LCY) London Gatwick Airport (LGW) Heathrow Airport (LHR) London Luton Airport (LTN) London Southend Airport (SEN) London Stansted Airport (STN).

• Is there any time difference between Seattle and London?

  The time difference between London and Seattle is 8h.

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

  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.