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Cheap SEA to LHR Flights

Prices found within past 7 days. Prices and availability subject to change. Additional terms may apply.

Seattle to London route information

Origin Airport Seattle - Tacoma Intl.
Destination Airport Heathrow
Airlines Serving Aer Lingus, Aeromexico, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, KLM, Lufthansa, SAS, United, Virgin Atlantic
Flight Price $470
Distance 4,786 mi






Cheap SEA to LHR Flights

  • Question : What is the cheapest day to fly?
    Answer : The cheapest day to fly from Seattle to London is on Tuesday. So, if you are trying to save some money on your next trip look for flights on Tuesday.
  • Question : How long is the flight from SEA to LHR?
    Answer : This direct flight will whoosh you away to your destination in nine hours and 20 minutes via British Airways. If you catch the 1:45 PM PDT departure, you'll arrive at 7:05 AM BST. Allowing you plenty of time to freshen up or grab a quick lunch (remember, there is a time change of eight hours).
  • Question : What is the cheapest airline flying from Seattle to London?
    Answer : British Airways is the leader in keeping costs low for their passengers over the next three months. Bookings are being made at just $441, which is a bargain when compared to the high-end bookings of $17,837.
  • Question : From Seattle to London, which day is going to have the most flight times?
    Answer : Saturday has the greatest variety of flight times for Seattle to London with six. However, with four flight times, Wednesday doesn't offer quite as many options when finding that perfect departure time.
  • Question : How long does it take to fly from Seattle to London?
    Answer : If you are flying on British Airways, your flight will be about nine hours and 20 minutes (remember, there is an eight-hour time change).
  • Question : How much is a plane ticket to London (LHR) from Seattle (SEA)?
    Answer : Cost can range anywhere from $441 to $17,837, prices for SEA to LHR do change a lot more than the majority of routes from the United States. Prices are usually cheaper the further out you book.
  • Question : What is the cheapest day to fly to London?
    Answer : As of May 20th, the best day for booking to London (LHR) is May 21st. It cost $441, which is 60% less than the average price to book the same route.

Apr 24, 2019

Idol was our Seattle on-the -ground service person. She was amazing. So friendly. And she heard our story about our weak father who was traveling with us and eased the way. Virgin Atlantic was awesome.

Apr 22, 2019

They needed to come around more often with water.

Apr 11, 2019

Food was great!

Apr 9, 2019

I didn’t get to ask anyone how to sign up for a mileage program.

Apr 6, 2019

There was no WiFi as that service was broken

Apr 5, 2019

First transatlantic flight and Virgin set the bar high. Fantastic service and great food and entertainment. Overall spectacular experience.

Mar 29, 2019

The seats were very tight and uncomfortable for a 9 hour flight.

Mar 28, 2019

I would have preferred more assistance with the meals since I have a peanut allergy

Mar 25, 2019

I'm not site impaired. Expedia passed on info that I was site impaired. It became quiet hilarious thought out the flights.

Mar 17, 2019

Love Delta. Friendly staff flying from Seattle to London on Febr 22! Great movie selection. Nice planes.... Not so much on the way back though, we flew back March 10th, sitting at the back of the plane and our dark haired flight attendant was moody and did not care about any of the passengers. But overall Delta is great. London check in was only easy because the lady employee helped many people at the machines. Long lines in London.