Flights from Seattle to London available from USD 671*
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Our best rates from Seattle to London
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Fly in the next 3 months: flights from Seattle to London (LON)
Icelandair airfare from Seattle to London - starting at USD 671
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USD
Seattle (SEA)to
London (LON)Jan 24 2027 - Feb 10 2027
From
USD 671
Viewed 19 hrs ago
Round trip
Economy
Seattle (SEA)to
London (LON)Jan 24 2027 - Feb 12 2027
From
USD 671
Viewed 19 hrs ago
Round trip
Economy
Seattle (SEA)to
London (LON)Jan 25 2027 - Feb 10 2027
From
USD 671
Viewed 19 hrs ago
Round trip
Economy
Seattle (SEA)to
London (LON)Dec 06 2026 - Dec 23 2026
From
USD 671
Viewed 19 hrs ago
Round trip
Economy
Seattle (SEA)to
London (LON)Dec 06 2026 - Dec 24 2026
From
USD 671
Viewed 19 hrs ago
Round trip
Economy
*Fares displayed have been collected within the last 72 hours 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 from Seattle (SEA) to London (LON) in the next 365 days
Book ahead and find our best prices in 2026 and beyond
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USD
From | To | Fare type | Dates | Price | |
|---|---|---|---|---|---|
| Seattle (SEA) | London (LON) | Round trip / Economy | Jan 27 2027 - Feb 12 2027 | From USD 671 Viewed 19 hrs ago | |
| Seattle (SEA) | London (LON) | Round trip / Economy | Jan 27 2027 - Feb 16 2027 | From USD 671 Viewed 19 hrs ago | |
| Seattle (SEA) | London (LON) | Round trip / Economy | Jan 24 2027 - Feb 10 2027 | From USD 671 Viewed 19 hrs 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.
Make the most of your trip
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.
Flying with Icelandair: more than just a journey
Generous baggage allowances
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Entertainment for all ages
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Delicious food and drink
Learn moreSee other popular destination cities with Icelandair