Flights from Seattle to London available from USD 518*

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 (LON)
Oct 14 2025 - Oct 15 2025
From
USD 518
Round trip
Economy

Seattle (SEA)to

London (LON)
Oct 14 2025 - Oct 16 2025
From
USD 518
Round trip
Economy

Seattle (SEA)to

London (LON)
Oct 14 2025 - Oct 29 2025
From
USD 518
Round trip
Economy

Seattle (SEA)to

London (LON)
Oct 14 2025 - Oct 31 2025
From
USD 518
Round trip
Economy

Seattle (SEA)to

London (LON)
Oct 14 2025 - Nov 03 2025
From
USD 518
Round trip
Economy

Seattle (SEA)to

London (LON)
Oct 14 2025 - Nov 08 2025
From
USD 518
Round trip
Economy

Seattle (SEA)to

London (LON)
Oct 14 2025 - Nov 09 2025
From
USD 518
Round trip
Economy

Seattle (SEA)to

London (LON)
Oct 14 2025 - Nov 13 2025
From
USD 518
Round trip
Economy

Seattle (SEA)to

London (LHR)
Sep 01 2025 - Sep 03 2025
From
USD 537
Round trip
Economy

Seattle (SEA)to

London (LHR)
Sep 04 2025 - Sep 18 2025
From
USD 537
Round trip
Economy

Seattle (SEA)to

London (LHR)
Sep 12 2025 - Sep 18 2025
From
USD 538
Round trip
Economy

Seattle (SEA)to

London (LHR)
Sep 16 2025 - Sep 24 2025
From
USD 562
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 04 2026 - Feb 11 2026

From

USD 523

Viewed 1 day ago

Seattle (SEA)London (LHR)Round trip
/
Economy		Feb 17 2026 - Feb 26 2026

From

USD 682

Viewed 2 days ago

Seattle (SEA)London (LHR)Round trip
/
Economy		Feb 05 2026 - Feb 14 2026

From

USD 682

Viewed 2 days ago

Seattle (SEA)London (LHR)Round trip
/
Economy		May 27 2026 - Jun 10 2026

From

USD 829

Viewed 2 days ago

Seattle (SEA)London (LHR)Round trip
/
Economy		Jun 16 2026 - Jun 28 2026

From

USD 869

Viewed 4 hrs ago

Seattle (SEA)London (LHR)Round trip
/
Economy		Jun 05 2026 - Jun 17 2026

From

USD 873

Viewed 1 day ago

Seattle (SEA)London (LHR)Round trip
/
Economy		Jun 23 2026 - Jul 10 2026

From

USD 1,108

Viewed 2 days ago

Seattle (SEA)London (LON)Round trip
/
Economy		Feb 17 2026 - Feb 23 2026

From

USD 519

Viewed 2 days ago

Seattle (SEA)London (LON)Round trip
/
Economy		Feb 17 2026 - Feb 24 2026

From

USD 519

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.