Cheap Flights from London (LON) to Seattle (SEA) from HK$4,089~

View HK$4,089 flight on Mon, 24 Nov 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at HK$4,089 for one-way flights and HK$4,986 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sat, 2 May - Mon, 4 May
LHR
London
SEA
Seattle
HK$4,986 Return, found 3 hours ago
HK$4,986
Return
found 3 hours ago
Select United flight, departing Sat, 2 May from London to Seattle, returning Mon, 4 May, priced at HK$4,986 found 3 hours ago
United
Fri, 1 May - Tue, 5 May
LHR
London
SEA
Seattle
HK$5,289 Return, found 3 hours ago
HK$5,289
Return
found 3 hours ago
Select United flight, departing Fri, 1 May from London to Seattle, returning Tue, 5 May, priced at HK$5,289 found 3 hours ago
Air Canada
Fri, 1 May - Tue, 5 May
LHR
London
SEA
Seattle
HK$5,332 Return, found 3 hours ago
HK$5,332
Return
found 3 hours ago
Select Air Canada flight, departing Fri, 1 May from London to Seattle, returning Tue, 5 May, priced at HK$5,332 found 3 hours ago
United
Fri, 1 May - Tue, 5 May
LHR
London
SEA
Seattle
HK$5,339 Return, found 3 hours ago
HK$5,339
Return
found 3 hours ago
Select United flight, departing Fri, 1 May from London to Seattle, returning Tue, 5 May, priced at HK$5,339 found 3 hours ago
United
Fri, 1 May - Tue, 5 May
LHR
London
SEA
Seattle
HK$5,341 Return, found 3 hours ago
HK$5,341
Return
found 3 hours ago
Select United flight, departing Fri, 1 May from London to Seattle, returning Tue, 5 May, priced at HK$5,341 found 3 hours ago
United
Fri, 1 May - Tue, 5 May
LHR
London
SEA
Seattle
HK$5,364 Return, found 3 hours ago
HK$5,364
Return
found 3 hours ago
Select United flight, departing Fri, 1 May from London to Seattle, returning Tue, 5 May, priced at HK$5,364 found 3 hours ago
Lufthansa
Fri, 1 May - Tue, 5 May
LHR
London
SEA
Seattle
HK$5,442 Return, found 3 hours ago
HK$5,442
Return
found 3 hours ago
Select Lufthansa flight, departing Fri, 1 May from London to Seattle, returning Tue, 5 May, priced at HK$5,442 found 3 hours ago
American Airlines
Sat, 27 Sep - Sat, 11 Oct
LGW
London
SEA
Seattle
HK$5,448 Return, found 4 days ago
HK$5,448
Return
found 4 days ago
Select American Airlines flight, departing Sat, 27 Sep from London to Seattle, returning Sat, 11 Oct, priced at HK$5,448 found 4 days ago
Delta
Fri, 1 May - Tue, 5 May
LHR
London
SEA
Seattle
HK$5,691 Return, found 3 hours ago
HK$5,691
Return
found 3 hours ago
Select Delta flight, departing Fri, 1 May from London to Seattle, returning Tue, 5 May, priced at HK$5,691 found 3 hours ago
Austrian Airlines
Fri, 1 May - Tue, 5 May
LHR
London
SEA
Seattle
HK$5,709 Return, found 3 hours ago
HK$5,709
Return
found 3 hours ago
Select Austrian Airlines flight, departing Fri, 1 May from London to Seattle, returning Tue, 5 May, priced at HK$5,709 found 3 hours ago

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

February is typically the cheapest month to fly

From HK$3,365 - HK$7,231 per traveller.

Graph displaying average flight prices per month

London to Seattle route information
Origin airport
Heathrow
Destination airport
Seattle - Tacoma Intl.
Return price
HK$4,986
Distance
7657 km

Flights from England to Seattle

Book cheap flights from England (LON) to Seattle (SEA) on Expedia.com.hk. Find the best flight deals to destinations around the world for your next leisure or business travel on Expedia.com.hk.

Search for flights from England (LON) to Seattle (SEA) to find great flight deals suitable to your travel date and time. Expedia.com.hk flight booking search engine is simple to use and looking for cheap flights is as easy as a click of a mouse or on your mobile devices.

Be assured that you’re seeing the best price guaranteed! Our friendly customer service representatives are here to serve you 24 hours day to provide assistance and answer any questions that you may have about booking your England (LON) to Seattle (SEA) trip. Call us at 3077-4857 (direct number - 24 hours day for English).

Save more when combine your Seattle flight with a hotel for a package deal! Discover additional savings by booking in advance. Now you can find activities in Seattle and things to do in Seattle for your perfect vacation with Expedia Thing to Do.

If you would like to book flights to Seattle more flexibly, many prefer to purchase one-way tickets with options to take different airlines. A one way ticket to Seattle is HK$4,089 now!

 

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 HK$4,986. 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 kilometers, 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.

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