Flights from Seattle to London available from USD 537*

Our best rates from Seattle to London

Jan 2025
FromUSD 669*
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)
Mar 11 2025 - Mar 20 2025
From
USD 669*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
Mar 11 2025 - Mar 26 2025
From
USD 669*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
Mar 12 2025 - Mar 18 2025
From
USD 669*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
Mar 16 2025 - Mar 26 2025
From
USD 669*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
Feb 11 2025 - Mar 05 2025
From
USD 669*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
Feb 11 2025 - Mar 13 2025
From
USD 669*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
Feb 24 2025 - Mar 05 2025
From
USD 669*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
Apr 29 2025 - Jun 01 2025
From
USD 641*
Round trip
/
Economy

Seattle (SEA)to

London (LHR)
Apr 13 2025 - Apr 28 2025
From
USD 683*
Round trip
/
Economy

Seattle (SEA)to

London (LHR)
Feb 04 2025 - Feb 11 2025
From
USD 726*
Round trip
/
Economy

Seattle (SEA)to

London (LHR)
Apr 19 2025 - Apr 29 2025
From
USD 751*
Round trip
/
Economy

Seattle (SEA)to

London (LHR)
Apr 14 2025 - Apr 27 2025
From
USD 829*
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 (LON)Round trip
/
Economy		Oct 09 2025 - Oct 25 2025

From

USD 672*

Viewed 10 hrs ago

FromSeattle (SEA)ToLondon (LON)Round trip
/
Economy		Oct 16 2025 - Nov 09 2025

From

USD 672*

Viewed 10 hrs ago

FromSeattle (SEA)ToLondon (LON)Round trip
/
Economy		Oct 08 2025 - Oct 23 2025

From

USD 672*

Viewed 10 hrs ago

FromSeattle (SEA)ToLondon (LON)Round trip
/
Economy		Oct 08 2025 - Oct 28 2025

From

USD 672*

Viewed 10 hrs ago

FromSeattle (SEA)ToLondon (LON)Round trip
/
Economy		Oct 08 2025 - Nov 06 2025

From

USD 672*

Viewed 10 hrs ago

FromSeattle (SEA)ToLondon (LON)Round trip
/
Economy		Oct 12 2025 - Oct 21 2025

From

USD 672*

Viewed 10 hrs ago

FromSeattle (SEA)ToLondon (LON)Round trip
/
Economy		Oct 12 2025 - Nov 06 2025

From

USD 672*

Viewed 10 hrs ago

FromSeattle (SEA)ToLondon (LON)Round trip
/
Economy		Oct 12 2025 - Nov 07 2025

From

USD 672*

Viewed 10 hrs ago

FromSeattle (SEA)ToLondon (LON)Round trip
/
Economy		Oct 12 2025 - Nov 12 2025

From

USD 672*

Viewed 10 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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