S$981 Cheap Flights from London to Seattle

View S$981 flight on Mon, 22 Sep, 2025Opens in a new window

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

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Cheap Flights from London to Seattle (LHR-SEA)

Prices were available within the past 7 days and start at S$981 for one-way flights and S$885 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Virgin Atlantic
Mon, 22 Sep - Thu, 25 Sep
LHR
London
SEA
Seattle
S$885 Return, found 2 days ago
S$885
Return
found 2 days ago
Select Virgin Atlantic flight, departing Mon, 22 Sep from London to Seattle, returning Thu, 25 Sep, priced at S$885 found 2 days ago
Swiss International Air Lines
Mon, 18 Aug - Tue, 2 Sep
LHR
London
SEA
Seattle
S$906 Return, found 5 days ago
S$906
Return
found 5 days ago
Select Swiss International Air Lines flight, departing Mon, 18 Aug from London to Seattle, returning Tue, 2 Sep, priced at S$906 found 5 days ago
Virgin Atlantic
Mon, 22 Sep - Thu, 25 Sep
LHR
London
SEA
Seattle
S$912 Return, found 2 days ago
S$912
Return
found 2 days ago
Select Virgin Atlantic flight, departing Mon, 22 Sep from London to Seattle, returning Thu, 25 Sep, priced at S$912 found 2 days ago
Virgin Atlantic
Mon, 22 Sep - Thu, 25 Sep
LHR
London
SEA
Seattle
S$920 Return, found 2 days ago
S$920
Return
found 2 days ago
Select Virgin Atlantic flight, departing Mon, 22 Sep from London to Seattle, returning Thu, 25 Sep, priced at S$920 found 2 days ago
Air France
Mon, 22 Sep - Thu, 25 Sep
LHR
London
SEA
Seattle
S$948 Return, found 2 days ago
S$948
Return
found 2 days ago
Select Air France flight, departing Mon, 22 Sep from London to Seattle, returning Thu, 25 Sep, priced at S$948 found 2 days ago
United
Tue, 9 Sep - Fri, 26 Sep
LHR
London
SEA
Seattle
S$982 Return, found 3 days ago
S$982
Return
found 3 days ago
Select United flight, departing Tue, 9 Sep from London to Seattle, returning Fri, 26 Sep, priced at S$982 found 3 days ago
Air France
Mon, 22 Sep - Thu, 25 Sep
LHR
London
SEA
Seattle
S$983 Return, found 2 days ago
S$983
Return
found 2 days ago
Select Air France flight, departing Mon, 22 Sep from London to Seattle, returning Thu, 25 Sep, priced at S$983 found 2 days ago
Lufthansa
Tue, 9 Sep - Fri, 26 Sep
LHR
London
SEA
Seattle
S$1,015 Return, found 3 days ago
S$1,015
Return
found 3 days ago
Select Lufthansa flight, departing Tue, 9 Sep from London to Seattle, returning Fri, 26 Sep, priced at S$1,015 found 3 days ago
Air Canada
Tue, 9 Sep - Fri, 26 Sep
LHR
London
SEA
Seattle
S$1,029 Return, found 3 days ago
S$1,029
Return
found 3 days ago
Select Air Canada flight, departing Tue, 9 Sep from London to Seattle, returning Fri, 26 Sep, priced at S$1,029 found 3 days ago
Delta
Tue, 9 Sep - Fri, 26 Sep
LHR
London
SEA
Seattle
S$1,030 Return, found 3 days ago
S$1,030
Return
found 3 days ago
Select Delta flight, departing Tue, 9 Sep from London to Seattle, returning Fri, 26 Sep, priced at S$1,030 found 3 days ago

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

February is typically the cheapest month to fly

From S$621 - S$1,237 per traveller.

Graph displaying average flight prices per month

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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, KLM, Lufthansa, Swiss International Air Lines, Turkish Airlines, United, Virgin Atlantic, WestJet
Return price
S$885
Distance
7657 km

Perfect flights from London to Seattle

Your Journey from London to Seattle

Start your unforgettable journey with Expedia. Our broad selection of flights from London to Seattle caters to every travel need. Whether you're yearning for a romantic escape, a solo adventure, or a cultural immersion, we've got you covered.
 

Choosing Your Ideal Flight

With Expedia, you have access to a wide range of airlines, including Virgin Atlantic, Swiss International Air Lines, Air France, WestJet, United, Lufthansa, Air Canada, Delta, American Airlines. Our selection of flights from Heathrow to Seattle - Tacoma Intl. caters to every traveler's requirements, ensuring your journey aligns with your schedule. With options from 20 airlines, you're bound to find the perfect flight.
 

Maximizing Value with London to Seattle Flights

Experience the joy of finding cheap flights from Heathrow to Seattle - Tacoma Intl. that fit your budget. Keep an eye out for our special deals and discounts, and check our flexible one-way fares from S$981 and roundtrip prices from S$885*.
 

Pre-Flight Essentials

Ensure a smooth journey from London to Seattle with Expedia. From information about check-in times and in-flight amenities to guidance on baggage policies, we provide all the essentials to prepare you for your flight.
 

Experience the Vibrant Seattle

Picture yourself stepping off the plane in Seattle and immersing yourself in the unique atmosphere of Seattle. From local markets to cultural festivals, each city offers its distinct charm. Make the most of your trip by exploring local attractions and indulging in the local cuisine. With Expedia, explore all this and more, tailored to your budget.
 

Added Convenience on Your London to Seattle Flight

Traveling with Expedia is more than just a flight. We offer details about in-flight amenities, baggage policies, and more to ensure a smooth and hassle-free journey. Choose from our variety of airlines and embark on a memorable journey from London to Seattle.
 

Beyond the Flight – Exploring Seattle

With Expedia, your adventure extends beyond the flight. Explore Seattle at your own pace by renting a car or booking a hotel. Discover hidden gems off the beaten path and create unforgettable memories.
 

Book Your Flight from London to Seattle with Confidence

Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support make your travel experience seamless and stress-free. Embark on your journey from London to Seattle with confidence. Book your travel arrangements with Expedia today.
 
*Note: Prices may vary based on availability and are subject to change.

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 S$885. 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 cancelled 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 kilometres 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

London Airports

London

Gatwick to Seattle
S$912.90
*Available to Expedia members.