Flights from Seattle to London available from USD 597*

Our best rates from Seattle to London

Feb 2025
FromUSD 655*
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)
May 20 2025 - Jun 03 2025
From
USD 961*
Round trip
/
Economy

Seattle (SEA)to

London (LHR)
Feb 28 2025 - Mar 05 2025
From
USD 1,103*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
Mar 30 2025 - Apr 28 2025
From
USD 614*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
Mar 31 2025 - Apr 13 2025
From
USD 614*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
Mar 31 2025 - Apr 18 2025
From
USD 614*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
Mar 31 2025 - Apr 22 2025
From
USD 614*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
Mar 31 2025 - Apr 24 2025
From
USD 614*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
Mar 31 2025 - Apr 28 2025
From
USD 614*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
Apr 23 2025 - Apr 27 2025
From
USD 614*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
Apr 24 2025 - Apr 28 2025
From
USD 614*
Round trip
/
Economy

Seattle (SEA)to

London (LHR)
Mar 06 2025 - Mar 12 2025
From
USD 644*
Round trip
/
Economy

Seattle (SEA)to

London (LHR)
May 07 2025 - May 14 2025
From
USD 744*
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.

 

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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
FromSeattle (SEA)ToLondon (LHR)Round trip
/
Economy		Oct 01 2025 - Nov 06 2025

From

USD 678*

Viewed 6 hrs ago

FromSeattle (SEA)ToLondon (LHR)Round trip
/
Economy		Sep 29 2025 - Oct 15 2025

From

USD 685*

Viewed 1 hour ago

FromSeattle (SEA)ToLondon (LHR)Round trip
/
Economy		Sep 27 2025 - Oct 07 2025

From

USD 735*

Viewed 4 hrs ago

FromSeattle (SEA)ToLondon (LHR)Round trip
/
Economy		Oct 22 2025 - Nov 04 2025

From

USD 597*

Viewed 16 hrs ago

FromSeattle (SEA)ToLondon (LHR)Round trip
/
Economy		Oct 28 2025 - Nov 11 2025

From

USD 693*

Viewed 23 hrs ago

FromSeattle (SEA)ToLondon (LHR)Round trip
/
Economy		Oct 01 2025 - Oct 08 2025

From

USD 807*

Viewed 1 day ago

FromSeattle (SEA)ToLondon (LON)Round trip
/
Economy		Nov 24 2025 - Nov 28 2025

From

USD 675*

Viewed 16 hrs ago

FromSeattle (SEA)ToLondon (LON)Round trip
/
Economy		Nov 24 2025 - Dec 04 2025

From

USD 675*

Viewed 16 hrs ago

FromSeattle (SEA)ToLondon (LON)Round trip
/
Economy		Nov 24 2025 - Dec 05 2025

From

USD 675*

Viewed 16 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.

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.

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