Flights from Seattle to London available from USD 436*

Promo code

Our best rates from Seattle to London

*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)
Oct 27 2025 - Nov 24 2025
From
USD 520
Round trip
Economy

Seattle (SEA)to

London (LHR)
Oct 20 2025 - Nov 05 2025
From
USD 521
Round trip
Economy

Seattle (SEA)to

London (LHR)
Aug 22 2025 - Sep 12 2025
From
USD 630
Round trip
Economy

Seattle (SEA)to

London (LHR)
Sep 17 2025 - Oct 03 2025
From
USD 649
Round trip
Economy

Seattle (SEA)to

London (LHR)
Aug 22 2025 - Sep 05 2025
From
USD 680
Round trip
Economy

Seattle (SEA)to

London (LHR)
Oct 10 2025 - Oct 17 2025
From
USD 684
Round trip
Economy

Seattle (SEA)to

London (LHR)
Sep 02 2025 - Sep 30 2025
From
USD 692
Round trip
Economy

Seattle (SEA)to

London (LHR)
Aug 21 2025 - Sep 12 2025
From
USD 759
Round trip
Economy

Seattle (SEA)to

London (LON)
Oct 26 2025 - Nov 08 2025
From
USD 517
Round trip
Economy

Seattle (SEA)to

London (LON)
Oct 26 2025 - Nov 10 2025
From
USD 517
Round trip
Economy

Seattle (SEA)to

London (LON)
Oct 26 2025 - Nov 20 2025
From
USD 517
Round trip
Economy

Seattle (SEA)to

London (LON)
Oct 26 2025 - Nov 21 2025
From
USD 517
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
Seattle (SEA)London (LHR)Round trip
/
Economy		Feb 10 2026 - Mar 06 2026

From

USD 436

Viewed 3 hrs ago

Seattle (SEA)London (LHR)Round trip
/
Economy		Mar 14 2026 - Mar 21 2026

From

USD 521

Viewed 16 hrs ago

Seattle (SEA)London (LHR)Round trip
/
Economy		Apr 08 2026 - Apr 18 2026

From

USD 669

Viewed 5 hrs ago

Seattle (SEA)London (LHR)Round trip
/
Economy		Feb 24 2026 - Mar 10 2026

From

USD 679

Viewed 1 day ago

Seattle (SEA)London (LHR)Round trip
/
Economy		Feb 17 2026 - Mar 03 2026

From

USD 679

Viewed 1 day ago

Seattle (SEA)London (LHR)Round trip
/
Economy		Feb 19 2026 - Mar 05 2026

From

USD 743

Viewed 1 day ago

Seattle (SEA)London (LHR)Round trip
/
Economy		Jun 02 2026 - Jun 26 2026

From

USD 935

Viewed 15 hrs ago

Seattle (SEA)London (LHR)Round trip
/
Economy		Jun 05 2026 - Jun 19 2026

From

USD 935

Viewed 9 hrs ago

Seattle (SEA)London (LHR)Round trip
/
Economy		Jul 03 2026 - Jul 13 2026

From

USD 1,212

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.