Cheap Flights from Seattle to London from $265

Frequently Asked Questions

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

  Based on Trip.com data, Icelandair offers one-way fares as low as $265 on Cheapest nonstop routes (e.g. SEA to LHR on Sat, Oct 24), while Scandinavian Airlines offers Cheapest nonstop round-trips from $526 departing on Sat, Oct 3 and returning on Tue, Oct 6.

• 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: Virgin Atlantic Alaska Airlines Icelandair 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 Seattle (SEA) to London (LON) and what is the distance?

  It takes around 9 hours 30 minutes to fly from Seattle (SEA) to London (LON).

• 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 42 flight per week flying from Seattle to London. You can check the weekly schedule for popular airlines on this route below: Aer Lingus: S/M/T/W/T/F/S -- EI8748 (20:56)

• 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 Sat, Oct 24, with one-way flights priced at just $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 September flight calendar, it's currently cheapest to fly from Seattle to London on September 29, 2026 with Scandinavian Airlines, with prices starting at $269.

• Which airports can I fly into London from Seattle?

  You can arrive at any of the following airports in London: Heathrow Airport (LHR), London Gatwick Airport (LGW), London City Airport (LCY), London Luton Airport (LTN), London Stansted Airport (STN), and London Southend Airport (SEN). Flights from Seattle-Tacoma International Airport to Heathrow Airport (SEA-LHR) are by far the most popular option for this route.

• 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.

• What is the average cost of a one-way flight from Seattle to London?

  Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from Seattle to London is $506. Fares vary by travel date, airline and availability.

• What is the average cost of a round-trip flight from Seattle to London?

  Based on Trip.com data for travel in the next 30 days, the average round-trip fare from Seattle to London is $1,083. The final price depends on the outbound and return dates, airline and fare conditions.

• How do I book flights from Seattle to London on Trip.com?

  Enter Seattle and London, choose your travel dates and passengers, then compare flights by price, duration and baggage. Select a fare, review the change and cancellation rules, enter traveler details and complete payment to receive your confirmation.

• Are there budget airlines on the Seattle to London route?

  Jetblue Airwaysare the most popular budget airlines flying from Seattle to London. Check baggage, seat and payment fees before comparing the final price.