Flights from Seattle to London available from USD 529*

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Our best rates from Seattle to London

Jul 2026
FromUSD 750*
Fare: Round trip/Economy
Aug 2026
FromUSD 650*
Fare: Round trip/Economy
Sep 2026
FromUSD 554*
Fare: Round trip/Economy
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    • *Fares displayed have been collected within the last 72hrs and may no longer be available at the time of booking

    Fly in the next three months: flights from Seattle to London

    USD

    Seattle (SEA)to

    London (LON)
    Oct 06 2026 - Oct 13 2026
    From
    USD 554
    Round trip
    Economy

    Seattle (SEA)to

    London (LON)
    Sep 30 2026 - Oct 08 2026
    From
    USD 554
    Round trip
    Economy

    Seattle (SEA)to

    London (LON)
    Sep 30 2026 - Oct 31 2026
    From
    USD 554
    Round trip
    Economy

    Seattle (SEA)to

    London (LON)
    Sep 30 2026 - Oct 10 2026
    From
    USD 554
    Round trip
    Economy

    Seattle (SEA)to

    London (LON)
    Sep 30 2026 - Oct 20 2026
    From
    USD 554
    Round trip
    Economy

    Seattle (SEA)to

    London (LON)
    Oct 03 2026 - Oct 08 2026
    From
    USD 554
    Round trip
    Economy

    Seattle (SEA)to

    London (LON)
    Oct 03 2026 - Oct 11 2026
    From
    USD 554
    Round trip
    Economy

    Seattle (SEA)to

    London (LON)
    Oct 03 2026 - Oct 23 2026
    From
    USD 554
    Round trip
    Economy

    Seattle (SEA)to

    London (LHR)
    Oct 07 2026 - Oct 27 2026
    From
    USD 629
    Round trip
    Economy

    Seattle (SEA)to

    London (LHR)
    Sep 29 2026 - Oct 06 2026
    From
    USD 634
    Round trip
    Economy

    Seattle (SEA)to

    London (LHR)
    Sep 09 2026 - Sep 16 2026
    From
    USD 643
    Round trip
    Economy

    Seattle (SEA)to

    London (LHR)
    Sep 13 2026 - Sep 23 2026
    From
    USD 643
    Round trip
    Economy
    *Fares displayed have been collected within the last 72hrs and may no longer be available at the time of booking. We display fares for Economy Light as standard but it is possible to change your class of service during the booking process. You can also add baggage, meals and extra legroom to your trip during booking.
     

    Plan ahead for your trip from Seattle to London with Icelandair

    USD
    Plan ahead for your trip from Seattle to London with Icelandair
    From
    To
    Fare type
    Dates
    Price
    Seattle (SEA)London (LON)Round trip
    /
    Economy    		Mar 16 2027 - Mar 22 2027

    From

    USD 739

    Viewed 1 hour ago

    Seattle (SEA)London (LON)Round trip
    /
    Economy    		Mar 16 2027 - Mar 28 2027

    From

    USD 739

    Viewed 1 hour ago

    Seattle (SEA)London (LON)Round trip
    /
    Economy    		Feb 06 2027 - Feb 17 2027

    From

    USD 739

    Viewed 1 hour ago

    Seattle (SEA)London (LON)Round trip
    /
    Economy    		Feb 06 2027 - Feb 19 2027

    From

    USD 739

    Viewed 1 hour ago

    Seattle (SEA)London (LON)Round trip
    /
    Economy    		Feb 06 2027 - Feb 26 2027

    From

    USD 739

    Viewed 1 hour ago

    Seattle (SEA)London (LON)Round trip
    /
    Economy    		Feb 06 2027 - Mar 08 2027

    From

    USD 739

    Viewed 1 hour ago

    Seattle (SEA)London (LON)Round trip
    /
    Economy    		Feb 07 2027 - Feb 17 2027

    From

    USD 739

    Viewed 1 hour ago

    Seattle (SEA)London (LON)Round trip
    /
    Economy    		Feb 07 2027 - Feb 24 2027

    From

    USD 739

    Viewed 1 hour ago

    Seattle (SEA)London (LON)Round trip
    /
    Economy    		Feb 07 2027 - Feb 26 2027

    From

    USD 739

    Viewed 1 hour ago

    *Fares displayed have been collected within the last 72hrs and may no longer be available at the time of booking. We display fares for Economy Light as standard but it is possible to change your class of service during the booking process. You can also add baggage, meals and extra legroom to your trip during booking.

    Flights to London from Seattle

    Get ready to embark on an exhilarating journey through the heart of London town, where iconic landmarks, upbeat culture, and unforgettable experiences are found around every corner. For an unrivaled in-flight experience and competitive airfares, choose Icelandair to fly from Seattle to London Heathrow (LHR) or Gatwick Airport (LGW).

     

    FAQs about travel from Seattle to London

    Helpful information for passengers traveling to London from Seattle

    What is the flight duration from Seattle to London, England?

    The average flight duration from Seattle to London Gatwick or Heathrow Airport is approximately 9 hours and 30 minutes non-stop, though this estimate does not include any planned stopovers.

    When you book flights to London from Seattle with Icelandair, passengers have the option to extend their stay in Iceland for up to seven days.

    When is the best time to fly from Seattle to London?

    The optimal time to fly to London from Seattle largely depends on your personal preferences and travel needs.

    While summer is characterized by long, bright days – perfect for outdoor events and sightseeing, spring (April to June) and early fall (September) tend to offer lower airfares, and the weather is still pleasant.

    Which airport in London will I land at?

    Passengers booking plane tickets from Seattle to London can fly into London Heathrow Airport (LHR) or Gatwick Airport (LGW).

    You can use the flight finder tool above to select flights to your desired airport.

    Does Icelandair offer direct flights to London from Seattle?

    Passengers flying from Seattle to London with Icelandair will transfer at Keflavík International Airport. From there, you will fly directly to London Heathrow or Gatwick airport.

    The flight time from KEF to LHR/LGW is around 3 hours.

    How can I find cheap flights from Seattle to London?

    Being flexible about which season you fly during, as well as which London airport you depart from can help you find a good deal on your tickets. Flying on a weekday may also help you secure a lower airfare, too.

    We also recommend checking our flight deals page regularly and booking in advance.