S$619 Cheap Flights from Seattle to London

View S$619 flight on Thu, 1 Oct, 2026Opens in a new window

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

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Cheap Flights from Seattle to London (SEA-LHR)

Prices were available within the past 7 days and start at S$619 for one-way flights and S$1,088 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Scandinavian Airlines
Wed, 30 Sept - Thu, 29 Oct
SEA
Seattle
LHR
London
S$1,088 Return, found 10 hours ago
S$1,088
Return
found 10 hours ago
Select Scandinavian Airlines flight, departing Wed, 30 Sept from Seattle to London, returning Thu, 29 Oct, priced at S$1,088 found 10 hours ago
Turkish Airlines
Wed, 30 Sept - Thu, 29 Oct
SEA
Seattle
LHR
London
S$1,097 Return, found 10 hours ago
S$1,097
Return
found 10 hours ago
Select Turkish Airlines flight, departing Wed, 30 Sept from Seattle to London, returning Thu, 29 Oct, priced at S$1,097 found 10 hours ago
Scandinavian Airlines
Wed, 30 Sept - Thu, 29 Oct
SEA
Seattle
LHR
London
S$1,126 Return, found 10 hours ago
S$1,126
Return
found 10 hours ago
Select Scandinavian Airlines flight, departing Wed, 30 Sept from Seattle to London, returning Thu, 29 Oct, priced at S$1,126 found 10 hours ago
Scandinavian Airlines
Wed, 30 Sept - Thu, 29 Oct
SEA
Seattle
LHR
London
S$1,165 Return, found 10 hours ago
S$1,165
Return
found 10 hours ago
Select Scandinavian Airlines flight, departing Wed, 30 Sept from Seattle to London, returning Thu, 29 Oct, priced at S$1,165 found 10 hours ago
Finnair
Wed, 30 Sept - Thu, 29 Oct
SEA
Seattle
LHR
London
S$1,191 Return, found 10 hours ago
S$1,191
Return
found 10 hours ago
Select Finnair flight, departing Wed, 30 Sept from Seattle to London, returning Thu, 29 Oct, priced at S$1,191 found 10 hours ago
British Airways
Wed, 30 Sept - Thu, 29 Oct
SEA
Seattle
LHR
London
S$1,227 Return, found 10 hours ago
S$1,227
Return
found 10 hours ago
Select British Airways flight, departing Wed, 30 Sept from Seattle to London, returning Thu, 29 Oct, priced at S$1,227 found 10 hours ago
Virgin Atlantic
Wed, 30 Sept - Thu, 29 Oct
SEA
Seattle
LHR
London
S$1,229 Return, found 10 hours ago
S$1,229
Return
found 10 hours ago
Select Virgin Atlantic flight, departing Wed, 30 Sept from Seattle to London, returning Thu, 29 Oct, priced at S$1,229 found 10 hours ago
Delta
Wed, 30 Sept - Thu, 29 Oct
SEA
Seattle
LHR
London
S$1,229 Return, found 10 hours ago
S$1,229
Return
found 10 hours ago
Select Delta flight, departing Wed, 30 Sept from Seattle to London, returning Thu, 29 Oct, priced at S$1,229 found 10 hours ago
United
Wed, 30 Sept - Thu, 29 Oct
SEA
Seattle
LHR
London
S$1,233 Return, found 10 hours ago
S$1,233
Return
found 10 hours ago
Select United flight, departing Wed, 30 Sept from Seattle to London, returning Thu, 29 Oct, priced at S$1,233 found 10 hours ago
Scandinavian Airlines
Wed, 30 Sept - Thu, 29 Oct
SEA
Seattle
LHR
London
S$1,242 Return, found 10 hours ago
S$1,242
Return
found 10 hours ago
Select Scandinavian Airlines flight, departing Wed, 30 Sept from Seattle to London, returning Thu, 29 Oct, priced at S$1,242 found 10 hours ago

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

April is typically the cheapest month to fly

From S$762 - S$1,430 per traveller.

Frequently asked questions

How much is a flight from Sea-Tac Airport to Heathrow Airport (LHR)?
If you're travelling between SEA and London Heathrow, round-trip journeys start from S$1,088. This price is based on fares listed within the last 7 days on Expedia for flights departing within the next year, so don't delay. Book today and save yourself money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from SEA to Heathrow Airport?
The majority of flights can be cancelled online, but whether you are charged a fee all comes down to your airline. If you do need to cancel your trip, follow the instructions in the Customer Service Portal.
How do I find cheap flights from Seattle - Tacoma Intl. Airport (SEA) to LHR 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 Seattle - Tacoma Intl. Airport (SEA) to London Heathrow flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport?
With a flight distance of 7,700 kilometres between Sea-Tac Airport and Heathrow Airport (LHR), this is a long trip. Be sure to drink plenty of water and go for a short walk down the aisle every now and then.
Which airlines fly direct from SEA to Heathrow Airport (LHR)?
It's easy to fly directly from Sea-Tac Airport to Heathrow Airport. Below are the most sought-after carriers that offer nonstop services on this route:

  • 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 SEA to LHR flight tickets cheaper when they're purchased at the last minute?
Flight prices are constantly going up and down, so there are no guarantees. While last-minute deals between Seattle - Tacoma Intl. Airport (SEA) and Heathrow Airport are of course possible, it's also a good idea to keep track of prices well before you fly. In fact, some airlines announce their prices up to a year prior to the departure date. Expedia is constantly updating the best bargains around, so keep checking back and be ready to lock in your seat when the price dips.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Heathrow
Airlines serving
Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, KLM, Lufthansa, Scandinavian Airlines, Singapore Airlines, Turkish Airlines, United, Virgin Atlantic, WestJet
Return price
S$1,087
Distance
7657 km
Average flight time
17 hours 35 mins

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