Cheap Flights from London (LHR) to Seattle (SEA) from HK$4,726~

View HK$4,726 flight on Thu, 9 Oct 2025Opens in a new window

Popular airlines from Heathrow Airport (LHR) to Seattle-Tacoma International Airport (SEA)

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

Prices were available within the past 7 days and start at HK$4,726 for one-way flights and HK$5,154 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Scandinavian Airlines
Thu, 9 Oct - Sun, 12 Oct
LHR
London
SEA
Seattle
HK$5,154 Return, found 3 days ago
HK$5,154
Return
found 3 days ago
Select Scandinavian Airlines flight, departing Thu, 9 Oct from London to Seattle, returning Sun, 12 Oct, priced at HK$5,154 found 3 days ago
Air Canada
Sun, 7 Dec - Sat, 13 Dec
LHR
London
SEA
Seattle
HK$5,183 Return, found 1 day ago
HK$5,183
Return
found 1 day ago
Select Air Canada flight, departing Sun, 7 Dec from London to Seattle, returning Sat, 13 Dec, priced at HK$5,183 found 1 day ago
United
Thu, 9 Oct - Sun, 12 Oct
LHR
London
SEA
Seattle
HK$5,197 Return, found 3 days ago
HK$5,197
Return
found 3 days ago
Select United flight, departing Thu, 9 Oct from London to Seattle, returning Sun, 12 Oct, priced at HK$5,197 found 3 days ago
Air Canada
Sun, 7 Dec - Sat, 13 Dec
LHR
London
SEA
Seattle
HK$5,233 Return, found 1 day ago
HK$5,233
Return
found 1 day ago
Select Air Canada flight, departing Sun, 7 Dec from London to Seattle, returning Sat, 13 Dec, priced at HK$5,233 found 1 day ago
Air Canada
Sun, 7 Dec - Sat, 13 Dec
LHR
London
SEA
Seattle
HK$5,235 Return, found 1 day ago
HK$5,235
Return
found 1 day ago
Select Air Canada flight, departing Sun, 7 Dec from London to Seattle, returning Sat, 13 Dec, priced at HK$5,235 found 1 day ago
Air Canada
Thu, 9 Oct - Sun, 12 Oct
LHR
London
SEA
Seattle
HK$5,250 Return, found 3 days ago
HK$5,250
Return
found 3 days ago
Select Air Canada flight, departing Thu, 9 Oct from London to Seattle, returning Sun, 12 Oct, priced at HK$5,250 found 3 days ago
Lufthansa
Sun, 7 Dec - Sat, 13 Dec
LHR
London
SEA
Seattle
HK$5,265 Return, found 1 day ago
HK$5,265
Return
found 1 day ago
Select Lufthansa flight, departing Sun, 7 Dec from London to Seattle, returning Sat, 13 Dec, priced at HK$5,265 found 1 day ago
American Airlines
Wed, 1 Oct - Mon, 13 Oct
LHR
London
SEA
Seattle
HK$5,436 Return, found 6 days ago
HK$5,436
Return
found 6 days ago
Select American Airlines flight, departing Wed, 1 Oct from London to Seattle, returning Mon, 13 Oct, priced at HK$5,436 found 6 days ago
American Airlines
Wed, 1 Oct - Mon, 13 Oct
LHR
London
SEA
Seattle
HK$5,436 Return, found 6 days ago
HK$5,436
Return
found 6 days ago
Select American Airlines flight, departing Wed, 1 Oct from London to Seattle, returning Mon, 13 Oct, priced at HK$5,436 found 6 days ago
Delta
Wed, 1 Oct - Mon, 13 Oct
LHR
London
SEA
Seattle
HK$5,544 Return, found 6 days ago
HK$5,544
Return
found 6 days ago
Select Delta flight, departing Wed, 1 Oct from London to Seattle, returning Mon, 13 Oct, priced at HK$5,544 found 6 days ago

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

February is typically the cheapest month to fly

From HK$3,811 - HK$7,587 per traveller.

Graph displaying average flight prices per month

0
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, Delta, Finnair, Iberia, Lufthansa, Swiss International Air Lines, Turkish Airlines, United, Virgin Atlantic, WestJet
Return price
HK$5,154
Distance
7657 km

Flights from London to Seattle

Book cheap flights from London (LHR) 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 London (LHR) 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 London (LHR) 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$4,726 now!

 

Frequently asked questions

How much is a flight from Heathrow Airport to Sea-Tac Airport?
Start packing your bags, because round-trip journeys from LHR to Seattle - Tacoma Intl. Airport (SEA) start from HK$5,154. That's based on airfares listed within the last 7 days on Expedia for flights departing within the next year. Prices can change quickly, so book now to secure the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Heathrow Airport (LHR) to Sea-Tac Airport?
Most flights can be canceled online, but whether you incur a fee depends on your airline. If you do have to cancel your trip, follow the instructions in the Customer Service Portal.
How do I find cheap flights from Heathrow Airport to SEA 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 Heathrow to Sea-Tac Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Heathrow Airport (LHR) to Seattle - Tacoma Intl. Airport (SEA)?
With around 7,700 kilometers separating LHR and Seattle - Tacoma Intl. Airport (SEA), your flight will be a long one. Pack wisely to make your time on board more comfortable. Little things like an extra pair of socks and a good neck pillow can make a big difference.
Which airlines fly direct from Heathrow Airport to Sea-Tac Airport?
Getting from London Heathrow to Sea-Tac Airport is easy when you have a good range of airlines to choose from. Here are a few of the best:

  • 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 Heathrow Airport to Sea-Tac Airport flight tickets cheaper when they're purchased at the last minute?
Late planners can sometimes score a bargain, with some of the cheapest airfares from London Heathrow to SEA surfacing a few weeks before the departure date. If you'd rather book ahead, Expedia compares and updates all the best flight deals continuously — as early as a year in advance in some cases. It depends on the carrier though, as not all airlines advertise prices that far in advance.

Explore a world of travel with Expedia

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