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

View AU$806 flight on Mon, 6 Oct. 2025Opens in a new window

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

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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.

Aer Lingus
Mon, 8 Sep. - Mon, 22 Sep.
LHR
London
SEA
Seattle
AU$871 Return, found 4 days ago
AU$871
Return
found 4 days ago
Select Aer Lingus flight, departing Mon, 8 Sep. from London to Seattle, returning Mon, 22 Sep., priced at AU$871 found 4 days ago
Icelandair
Mon, 1 Sep. - Sat, 6 Sep.
LGW
London
SEA
Seattle
AU$908 Return, found 6 days ago
AU$908
Return
found 6 days ago
Select Icelandair flight, departing Mon, 1 Sep. from London to Seattle, returning Sat, 6 Sep., priced at AU$908 found 6 days ago
Lufthansa
Sun, 7 Dec. - Sat, 13 Dec.
LHR
London
SEA
Seattle
AU$1,016 Return, found 11 hours ago
AU$1,016
Return
found 11 hours ago
Select Lufthansa flight, departing Sun, 7 Dec. from London to Seattle, returning Sat, 13 Dec., priced at AU$1,016 found 11 hours ago
American Airlines
Tue, 3 Feb. - Tue, 10 Feb.
LGW
London
SEA
Seattle
AU$1,020 Return, found 6 days ago
AU$1,020
Return
found 6 days ago
Select American Airlines flight, departing Tue, 3 Feb. from London to Seattle, returning Tue, 10 Feb., priced at AU$1,020 found 6 days ago
Delta
Tue, 3 Feb. - Tue, 10 Feb.
LHR
London
SEA
Seattle
AU$1,029 Return, found 6 days ago
AU$1,029
Return
found 6 days ago
Select Delta flight, departing Tue, 3 Feb. from London to Seattle, returning Tue, 10 Feb., priced at AU$1,029 found 6 days ago
Virgin Atlantic
Wed, 4 Feb. - Wed, 11 Feb.
LHR
London
SEA
Seattle
AU$1,045 Return, found 2 days ago
AU$1,045
Return
found 2 days ago
Select Virgin Atlantic flight, departing Wed, 4 Feb. from London to Seattle, returning Wed, 11 Feb., priced at AU$1,045 found 2 days ago
Scandinavian Airlines
Thu, 16 Oct. - Thu, 6 Nov.
LHR
London
SEA
Seattle
AU$1,052 Return, found 4 days ago
AU$1,052
Return
found 4 days ago
Select Scandinavian Airlines flight, departing Thu, 16 Oct. from London to Seattle, returning Thu, 6 Nov., priced at AU$1,052 found 4 days ago
American Airlines
Mon, 29 Sep. - Mon, 13 Oct.
LHR
London
SEA
Seattle
AU$1,062 Return, found 5 days ago
AU$1,062
Return
found 5 days ago
Select American Airlines flight, departing Mon, 29 Sep. from London to Seattle, returning Mon, 13 Oct., priced at AU$1,062 found 5 days ago
United
Tue, 5 May - Thu, 28 May
LHR
London
SEA
Seattle
AU$1,092 Return, found 21 hours ago
AU$1,092
Return
found 21 hours ago
Select United flight, departing Tue, 5 May from London to Seattle, returning Thu, 28 May, priced at AU$1,092 found 21 hours ago
Austrian Airlines
Mon, 29 Sep. - Mon, 13 Oct.
LHR
London
SEA
Seattle
AU$1,101 Return, found 5 days ago
AU$1,101
Return
found 5 days ago
Select Austrian Airlines flight, departing Mon, 29 Sep. from London to Seattle, returning Mon, 13 Oct., priced at AU$1,101 found 5 days 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
Heathrow
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, United, Virgin Atlantic, WestJet
Return price
AU$870
Distance
7657 km

LON to SEA Flights

Ready to get away? Use Expedia.com.au to book cheap flights from England to Seattle AU$871, 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$871. 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

London Airports

London

Heathrow to Seattle
AU$870.15
*Available to Expedia members.