Flights from Seattle to London available from USD 535*

Our best rates from Seattle to London

Mar 2025
FromUSD 703*
Fare: Round trip/Economy
Displaying fares for March-2025
21

Fr

MAR

22

Sa

23

Su

24

Mo

25

Tu

26

We

27

Th

28

Fr

29

Sa

30

Su

31

Mo

01

Tu

APR

02

We

03

Th

04

Fr

05

Sa

06

Su

07

Mo

08

Tu

09

We

10

Th

11

Fr

12

Sa

13

Su

14

Mo

15

Tu

16

We

17

Th

18

Fr

19

Sa

20

Su

*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)
May 05 2025 - May 29 2025
From
USD 582*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
May 05 2025 - May 30 2025
From
USD 582*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
May 05 2025 - Jun 02 2025
From
USD 582*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
May 05 2025 - Jun 03 2025
From
USD 582*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
May 05 2025 - Jun 04 2025
From
USD 582*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
May 06 2025 - May 27 2025
From
USD 582*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
May 06 2025 - Jun 05 2025
From
USD 582*
Round trip
/
Economy

Seattle (SEA)to

London (LON)
May 07 2025 - May 29 2025
From
USD 582*
Round trip
/
Economy

Seattle (SEA)to

London (LHR)
May 01 2025 - May 20 2025
From
USD 681*
Round trip
/
Economy

Seattle (SEA)to

London (LHR)
May 10 2025 - May 22 2025
From
USD 695*
Round trip
/
Economy

Seattle (SEA)to

London (LHR)
May 06 2025 - May 27 2025
From
USD 759*
Round trip
/
Economy

Seattle (SEA)to

London (LHR)
Jun 02 2025 - Jun 11 2025
From
USD 768*
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.

 

Blue image with a map of Iceland and text that reads: Include a little more of Iceland in your journey. Add a Stopover

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		Nov 20 2025 - Dec 01 2025

From

USD 569

Viewed 1 day ago

Seattle (SEA)London (LON)Round trip
/
Economy		Nov 22 2025 - Nov 30 2025

From

USD 569

Viewed 17 hrs ago

Seattle (SEA)London (LON)Round trip
/
Economy		Nov 22 2025 - Dec 01 2025

From

USD 569

Viewed 17 hrs ago

Seattle (SEA)London (LON)Round trip
/
Economy		Nov 21 2025 - Dec 02 2025

From

USD 569

Viewed 17 hrs ago

Seattle (SEA)London (LON)Round trip
/
Economy		Nov 20 2025 - Nov 30 2025

From

USD 569

Viewed 1 day ago

Seattle (SEA)London (LON)Round trip
/
Economy		Nov 20 2025 - Dec 02 2025

From

USD 569

Viewed 1 day ago

Seattle (SEA)London (LON)Round trip
/
Economy		Nov 22 2025 - Dec 02 2025

From

USD 569

Viewed 17 hrs ago

Seattle (SEA)London (LON)Round trip
/
Economy		Nov 21 2025 - Nov 30 2025

From

USD 569

Viewed 17 hrs ago

Seattle (SEA)London (LON)Round trip
/
Economy		Nov 21 2025 - Dec 01 2025

From

USD 569

Viewed 17 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.

Other people also looked at