Flights from Seattle to London available from USD 647*

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Our best rates from Seattle to London

Jun 2025
FromUSD 938*
Fare: Round trip/Economy
Displaying fares for June-2025
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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)
Sep 08 2025 - Oct 02 2025
From
USD 653
Round trip
Economy

Seattle (SEA)to

London (LON)
Sep 08 2025 - Oct 08 2025
From
USD 653
Round trip
Economy

Seattle (SEA)to

London (LON)
Sep 09 2025 - Oct 07 2025
From
USD 653
Round trip
Economy

Seattle (SEA)to

London (LON)
Sep 09 2025 - Oct 08 2025
From
USD 653
Round trip
Economy

Seattle (SEA)to

London (LON)
Sep 09 2025 - Oct 09 2025
From
USD 653
Round trip
Economy

Seattle (SEA)to

London (LON)
Sep 10 2025 - Oct 01 2025
From
USD 653
Round trip
Economy

Seattle (SEA)to

London (LON)
Sep 10 2025 - Oct 02 2025
From
USD 653
Round trip
Economy

Seattle (SEA)to

London (LON)
Sep 10 2025 - Oct 07 2025
From
USD 653
Round trip
Economy

Seattle (SEA)to

London (LHR)
Aug 10 2025 - Aug 31 2025
From
USD 714
Round trip
Economy

Seattle (SEA)to

London (LHR)
Aug 24 2025 - Aug 30 2025
From
USD 714
Round trip
Economy

Seattle (SEA)to

London (LHR)
Jul 06 2025 - Jul 22 2025
From
USD 999
Round trip
Economy

Seattle (SEA)to

London (LHR)
Jul 06 2025 - Jul 24 2025
From
USD 999
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 (LON)Round trip
/
Economy		Mar 17 2026 - Mar 24 2026

From

USD 647

Viewed 18 hrs ago

Seattle (SEA)London (LON)Round trip
/
Economy		Mar 16 2026 - Mar 20 2026

From

USD 647

Viewed 18 hrs ago

Seattle (SEA)London (LON)Round trip
/
Economy		Dec 10 2025 - Dec 17 2025

From

USD 647

Viewed 1 hour ago

Seattle (SEA)London (LON)Round trip
/
Economy		Dec 10 2025 - Dec 18 2025

From

USD 647

Viewed 1 hour ago

Seattle (SEA)London (LON)Round trip
/
Economy		Dec 10 2025 - Dec 19 2025

From

USD 647

Viewed 1 hour ago

Seattle (SEA)London (LON)Round trip
/
Economy		Dec 29 2025 - Jan 14 2026

From

USD 647

Viewed 1 hour ago

Seattle (SEA)London (LON)Round trip
/
Economy		Dec 30 2025 - Jan 09 2026

From

USD 647

Viewed 1 hour ago

Seattle (SEA)London (LON)Round trip
/
Economy		Dec 30 2025 - Jan 13 2026

From

USD 647

Viewed 1 hour ago

Seattle (SEA)London (LON)Round trip
/
Economy		Dec 30 2025 - Jan 15 2026

From

USD 647

Viewed 1 hour 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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