Flights from Seattle to London available from USD 730*

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Our best rates from Seattle to London

Jun 2026
FromUSD 855*
Fare: Round trip/Economy
Jul 2026
FromUSD 757*
Fare: Round trip/Economy
Aug 2026
FromUSD 748*
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 (LHR)
    Sep 04 2026 - Sep 11 2026
    From
    USD 754
    Round trip
    Economy

    Seattle (SEA)to

    London (LHR)
    Jul 06 2026 - Jul 21 2026
    From
    USD 757
    Round trip
    Economy

    Seattle (SEA)to

    London (LHR)
    Jul 11 2026 - Jul 21 2026
    From
    USD 758
    Round trip
    Economy

    Seattle (SEA)to

    London (LHR)
    Jul 23 2026 - Jul 28 2026
    From
    USD 761
    Round trip
    Economy

    Seattle (SEA)to

    London (LHR)
    Aug 04 2026 - Aug 18 2026
    From
    USD 804
    Round trip
    Economy

    Seattle (SEA)to

    London (LHR)
    Jun 22 2026 - Jul 09 2026
    From
    USD 856
    Round trip
    Economy

    Seattle (SEA)to

    London (LHR)
    Jun 29 2026 - Jul 07 2026
    From
    USD 857
    Round trip
    Economy

    Seattle (SEA)to

    London (LHR)
    Jul 10 2026 - Jul 16 2026
    From
    USD 950
    Round trip
    Economy

    Seattle (SEA)to

    London (LON)
    Aug 31 2026 - Sep 18 2026
    From
    USD 748
    Round trip
    Economy

    Seattle (SEA)to

    London (LON)
    Aug 28 2026 - Sep 07 2026
    From
    USD 751
    Round trip
    Economy

    Seattle (SEA)to

    London (LON)
    Sep 02 2026 - Sep 08 2026
    From
    USD 754
    Round trip
    Economy

    Seattle (SEA)to

    London (LON)
    Sep 08 2026 - Sep 24 2026
    From
    USD 754
    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 (LHR)Round trip
    /
    Economy    		Dec 28 2026 - Jan 03 2027

    From

    USD 914

    Viewed 7 hrs ago

    Seattle (SEA)London (LHR)Round trip
    /
    Economy    		Apr 15 2027 - May 16 2027

    From

    USD 1,026

    Viewed 1 day ago

    Seattle (SEA)London (LON)Round trip
    /
    Economy    		Jan 11 2027 - Jan 16 2027

    From

    USD 790

    Viewed 2 days ago

    Seattle (SEA)London (LON)Round trip
    /
    Economy    		Mar 08 2027 - Mar 15 2027

    From

    USD 916

    Viewed 1 day ago

    Seattle (SEA)London (LON)Round trip
    /
    Economy    		Apr 30 2027 - May 14 2027

    From

    USD 958

    Viewed 2 days ago

    Seattle (SEA)London (LON)Round trip
    /
    Economy    		Mar 24 2027 - Apr 04 2027

    From

    USD 982

    Viewed 1 day ago

    Seattle (SEA)London (LON)Round trip
    /
    Economy    		May 09 2027 - May 29 2027

    From

    USD 1,034

    Viewed 1 day ago

    Seattle (SEA)London (LON)Round trip
    /
    Economy    		May 17 2027 - May 22 2027

    From

    USD 1,085

    Viewed 1 day ago

    Seattle (SEA)London (LON)Round trip
    /
    Economy    		May 21 2027 - May 31 2027

    From

    USD 1,104

    Viewed 2 days 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.