Cheap Flights from London (LON) to Seattle (SEA)

View AU$882 flight on Tue, 18 Nov. 2025Opens in a new window

Popular airlines from London to Seattle, WA (SEA-Seattle - Tacoma Intl.)

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 35% on select hotels after you book a flight*
  • payments icon

    Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap Flights from London (LON) to Seattle (SEA)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Icelandair
Tue, 18 Nov. - Mon, 8 Dec.
LGW
London
SEA
Seattle
AU$923 Return, found 1 day ago
AU$923
Return
found 1 day ago
Select Icelandair flight, departing Tue, 18 Nov. from London to Seattle, returning Mon, 8 Dec., priced at AU$923 found 1 day ago
Icelandair
Sun, 7 Dec. - Sat, 13 Dec.
LHR
London
SEA
Seattle
AU$928 Return, found 4 days ago
AU$928
Return
found 4 days ago
Select Icelandair flight, departing Sun, 7 Dec. from London to Seattle, returning Sat, 13 Dec., priced at AU$928 found 4 days ago
Lufthansa
Sun, 7 Dec. - Sat, 13 Dec.
LHR
London
SEA
Seattle
AU$1,016 Return, found 4 days ago
AU$1,016
Return
found 4 days ago
Select Lufthansa flight, departing Sun, 7 Dec. from London to Seattle, returning Sat, 13 Dec., priced at AU$1,016 found 4 days ago
Virgin Atlantic
Wed, 4 Feb. - Wed, 11 Feb.
LHR
London
SEA
Seattle
AU$1,045 Return, found 6 days ago
AU$1,045
Return
found 6 days ago
Select Virgin Atlantic flight, departing Wed, 4 Feb. from London to Seattle, returning Wed, 11 Feb., priced at AU$1,045 found 6 days ago
Delta
Wed, 4 Feb. - Wed, 11 Feb.
LHR
London
SEA
Seattle
AU$1,047 Return, found 6 days ago
AU$1,047
Return
found 6 days ago
Select Delta flight, departing Wed, 4 Feb. from London to Seattle, returning Wed, 11 Feb., priced at AU$1,047 found 6 days ago
American Airlines
Wed, 4 Feb. - Wed, 11 Feb.
LGW
London
SEA
Seattle
AU$1,047 Return, found 6 days ago
AU$1,047
Return
found 6 days ago
Select American Airlines flight, departing Wed, 4 Feb. from London to Seattle, returning Wed, 11 Feb., priced at AU$1,047 found 6 days ago
United
Mon, 27 Oct. - Mon, 10 Nov.
LHR
London
SEA
Seattle
AU$1,055 Return, found 18 hours ago
AU$1,055
Return
found 18 hours ago
Select United flight, departing Mon, 27 Oct. from London to Seattle, returning Mon, 10 Nov., priced at AU$1,055 found 18 hours ago
Aer Lingus
Mon, 27 Oct. - Mon, 10 Nov.
LHR
London
SEA
Seattle
AU$1,058 Return, found 18 hours ago
AU$1,058
Return
found 18 hours ago
Select Aer Lingus flight, departing Mon, 27 Oct. from London to Seattle, returning Mon, 10 Nov., priced at AU$1,058 found 18 hours ago
Air Canada
Mon, 27 Oct. - Mon, 10 Nov.
LHR
London
SEA
Seattle
AU$1,066 Return, found 18 hours ago
AU$1,066
Return
found 18 hours ago
Select Air Canada flight, departing Mon, 27 Oct. from London to Seattle, returning Mon, 10 Nov., priced at AU$1,066 found 18 hours ago
Virgin Atlantic
Mon, 17 Nov. - Mon, 8 Dec.
LCY
London
SEA
Seattle
AU$1,096 Return, found 1 day ago
AU$1,096
Return
found 1 day ago
Select Virgin Atlantic flight, departing Mon, 17 Nov. from London to Seattle, returning Mon, 8 Dec., priced at AU$1,096 found 1 day ago

Find the cheapest month to fly from London (LON) to Seattle (SEA)

February is typically the cheapest month to fly

From AU$664 - AU$1,427 per traveller.

Graph displaying average flight prices per month

Flight from London to Seattle route information
Origin airport
Gatwick
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, KLM, Lufthansa, Turkish Airlines, United, Virgin Atlantic
Return price
AU$922
Distance
7697 km

LON to SEA Flights

Ready to get away? Use Expedia.com.au to book cheap flights from England to Seattle AU$923, and have leftover money to spare on adventures and activities while you’re in town. We have the world’s largest selection of flights, not to mention lower airfares than you’ll find anywhere else on the Internet.

Our user-friendly tools make it easier than ever to book LON to SEA flights, even if you’re hoping to hop aboard one of the last-minute flights leaving today. So whether you seek a spontaneous trip to this city’s hottest attractions, or prefer to plan out every detail of your adventure ahead of time, Expedia.com.au is here to help you find exactly what you are interested in.

If you’re on the hunt for cheap flights to Seattle from England, you need not look any further. We make it simple for you to compare different airline carriers or choose the one that appeals to you most. We work with dozens of airlines in order to offer you incredible deals on business and personal travel. Start by searching through our selection of plane tickets today, and you’ll be in the sky before you know it.

Frequently asked questions

How much is a flight from London (LON-All Airports) to Sea-Tac Airport?
Within the past 7 days on Expedia, for flights departing within the next year, the lowest price advertised for a round-trip journey from London (LON-All Airports) to Sea-Tac Airport was AU$923. Cheap tickets don't wait forever, so book yours today. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from London (LON-All Airports) to Seattle - Tacoma Intl. Airport (SEA)?
This can vary between airlines, as each has its own terms and conditions. Visit the Customer Service Portal, where you'll find easy-to-follow instructions on how to cancel your flight online.
How do I find cheap flights from London (LON-All Airports) to Sea-Tac Airport that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for London (LON-All Airports) to SEA flights, you'll see a "no change fees" filter for you to select.
How far is the flight from London (LON-All Airports) to Sea-Tac Airport?
The distance is around 7 700 kilometres, so fill your carry-on bag with all you need to make your journey comfortable. Not sure what to take on board your England to SeaTac flight? A travel pillow, earplugs and a sleep mask are a few essentials.
Which airlines fly direct from London (LON-All Airports) to SEA?
Whether you're after a one-way or return flight, you'll have your choice of airlines that will take you straight from London (LON-All Airports) to Sea-Tac Airport. These are some of the most popular ones:

  • Virgin Atlantic - (VS) with 30 monthly flights
  • American Airlines - (AA) with 30 monthly flights
  • British Airways - (BA) with 30 monthly flights
  • Delta Air Lines - (DL) with 17 monthly flights

Are London (LON-All Airports) to SEA flight tickets cheaper when they're purchased at the last minute?
Flight prices go up and down like a yo-yo, so not always. While last-minute deals between London (LON-All Airports) and Sea-Tac Airport are of course possible, it's also a good idea to keep a close eye on prices well before you fly. In fact, some carriers publish their prices up to a year before the departure date. Expedia is continuously updating the biggest bargains around, so keep checking back and be ready to book when the price is right.

Explore a world of travel with Expedia

Seattle Flight Deals

Seattle Paine Field Intl. Airport

London Airports

London

Heathrow to Seattle
AU$927.80
*Available to Expedia members.