Flights from London to Seattle available from GBP 387*

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Our best rates from London to Seattle

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

    GBP

    London (LON)to

    Seattle (SEA)
    30 08 2025 - 30 09 2025
    From
    GBP 392
    Round trip
    Economy

    London (LON)to

    Seattle (SEA)
    06 09 2025 - 05 10 2025
    From
    GBP 392
    Round trip
    Economy

    London (LON)to

    Seattle (SEA)
    12 09 2025 - 05 10 2025
    From
    GBP 392
    Round trip
    Economy

    London (LON)to

    Seattle (SEA)
    12 09 2025 - 06 10 2025
    From
    GBP 392
    Round trip
    Economy

    London (LON)to

    Seattle (SEA)
    12 09 2025 - 08 10 2025
    From
    GBP 392
    Round trip
    Economy

    London (LON)to

    Seattle (SEA)
    12 09 2025 - 09 10 2025
    From
    GBP 392
    Round trip
    Economy

    London (LON)to

    Seattle (SEA)
    13 09 2025 - 01 10 2025
    From
    GBP 392
    Round trip
    Economy

    London (LON)to

    Seattle (SEA)
    13 09 2025 - 02 10 2025
    From
    GBP 392
    Round trip
    Economy

    London (LGW)to

    Seattle (SEA)
    11 09 2025 - 19 09 2025
    From
    GBP 397
    Round trip
    Economy

    London (LGW)to

    Seattle (SEA)
    14 08 2025 - 27 09 2025
    From
    GBP 397
    Round trip
    Economy

    London (LGW)to

    Seattle (SEA)
    05 09 2025 - 20 09 2025
    From
    GBP 397
    Round trip
    Economy

    London (LGW)to

    Seattle (SEA)
    28 08 2025 - 09 09 2025
    From
    GBP 519
    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.

    Blue image with a map of Iceland and text that reads: Include a little more of Iceland in your journey. Add a Stopover

    Plan ahead for your trip from London to Seattle with Icelandair

    GBP
    Plan ahead for your trip from London to Seattle with Icelandair
    From
    To
    Fare type
    Dates
    Price
    London (LON)Seattle (SEA)Round trip
    /
    Economy
    18 01 2026 - 08 02 2026

    From

    GBP 397

    Viewed 2 days ago

    London (LON)Seattle (SEA)Round trip
    /
    Economy
    18 01 2026 - 11 02 2026

    From

    GBP 397

    Viewed 2 days ago

    London (LON)Seattle (SEA)Round trip
    /
    Economy
    18 01 2026 - 16 02 2026

    From

    GBP 397

    Viewed 2 days ago

    London (LON)Seattle (SEA)Round trip
    /
    Economy
    18 01 2026 - 18 02 2026

    From

    GBP 397

    Viewed 2 days ago

    London (LON)Seattle (SEA)Round trip
    /
    Economy
    19 01 2026 - 27 01 2026

    From

    GBP 397

    Viewed 2 days ago

    London (LON)Seattle (SEA)Round trip
    /
    Economy
    19 01 2026 - 29 01 2026

    From

    GBP 397

    Viewed 2 days ago

    London (LON)Seattle (SEA)Round trip
    /
    Economy
    19 01 2026 - 31 01 2026

    From

    GBP 397

    Viewed 2 days ago

    London (LON)Seattle (SEA)Round trip
    /
    Economy
    19 01 2026 - 02 02 2026

    From

    GBP 397

    Viewed 2 days ago

    London (LON)Seattle (SEA)Round trip
    /
    Economy
    19 01 2026 - 03 02 2026

    From

    GBP 397

    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.

    Explore Seattle

    the famous seattle space needle at night

    London to Seattle

    When you take an Icelandair flight to Seattle from London, you can either travel from London Heathrow or London Gatwick. Both offer excellent transport links from the city centre, frequent departures and a wide range of airport services for travellers.

    As a major international hub, flying from Heathrow might give you more flight options and flexibility about when you travel. As the smaller airport of the two, Gatwick is a bit less crowded but there are often fewer flights going to the US, so you’ll have less choice when booking your travel.

    Top attractions in Seattle

    Seattle is a city that balances natural beauty and vibrant city life, offering something for everyone to enjoy.

    Visit Seattle’s iconic Space Needle and head up to the observation deck to see panoramic views of downtown, Seattle’s skyline and Puget Sound – the city’s scenic waterfront. Explore Chihuly Garden and Glass Museum to see some unique glass installations or the Museum of Pop Culture for an interactive experience for all ages. You can also visit Pioneer Square, Seattle’s oldest neighbourhood full of charming cafes and independent bookshops, perfect for sheltering from the rain. streets.

    And don’t forget to stop off for a cup of coffee! We recommend grabbing one to go and exploring Pike Place Market with its fresh produce and artisanal goods.

    a ferris wheel at the seattle waterfront
    the seattle skyline at sunset

    Flights from London to Seattle

    For the best fares and an unparalleled flying experience, choose Icelandair for flights from London (LHR/LGW) to Seattle (SEA). When you fly to the US with Icelandair, our in-flight entertainment will make your journey fly by, and our abundance of charging points means that you can land in Seattle raring to go! You'll also enjoy an easy transit at our Keflavik hub and one of the shortest flying times over the Atlantic.

    Add a stopover in Iceland to your journey

    When you fly from London to Seattle with Icelandair, you can add a stopover in Iceland at no extra airfare. Stay for anywhere from 1 to 7 days to add another destination to your break.

    Immerse yourself in Icelandic culture with a few days in Reykjavik, our friendly capital. Or, for a taste of adventure, discover Iceland’s natural wonders like those on the Golden Circle route. Whether you want to explore on your own or add a tour to your trip, spend a little time in Iceland and enjoy two destinations for the price of one!

    seattle at night

     

    FAQs about travel from London to Seattle

    Helpful information for travellers visiting Seattle

    What is the flight time from London to Seattle?

    The flight duration from London Heathrow (LHR) to Seattle (SEA) is roughly 9-10 hours non-stop, though this does not account for any layovers you have planned. Icelandair also offers a few flights to Seattle from London Gatwick (LGW), which have a similar duration.

    How can I get the cheapest flights to Seattle from London?

    Being flexible on when you book your flights, as well as which airport in London you fly from can help you find cheap flights from London to Seattle. We also advise booking your holiday in advance and checking our flight deals regularly to secure the best price.

    Does Icelandair offer direct flights to Seattle from London?

    Passengers flying to Seattle from London with Icelandair will change at Keflavík International Airport before their onward journey to Seattle. The flight time from Keflavík to Seattle is around 7-8 hours.

    Which London airports offer Icelandair flights to Seattle?

    Passengers travelling from London to Seattle with Icelandair can fly from either London Heathrow Airport or London Gatwick Airport. Use the flight finder tool above to choose flights from your preferred airport.