£372 Cheap Flights from London (LHR) to Seattle (SEA)

View £372 flight on Wed, 17 Mar 2027Opens in a new window

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

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

Prices were available within the past 7 days and start at £372 for one-way flights and £482 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Icelandair
Wed, 7 Oct - Wed, 21 Oct
LHR
London
SEA
Seattle
£482 Return, found 1 day ago
£482
Return
found 1 day ago
Select Icelandair flight, departing Wed, 7 Oct from London to Seattle, returning Wed, 21 Oct, priced at £482 found 1 day ago
KLM
Tue, 13 Oct - Tue, 27 Oct
LHR
London
SEA
Seattle
£550 Return, found 2 days ago
£550
Return
found 2 days ago
Select KLM flight, departing Tue, 13 Oct from London to Seattle, returning Tue, 27 Oct, priced at £550 found 2 days ago
Delta
Tue, 20 Oct - Tue, 3 Nov
LHR
London
SEA
Seattle
£550 Return, found 2 days ago
£550
Return
found 2 days ago
Select Delta flight, departing Tue, 20 Oct from London to Seattle, returning Tue, 3 Nov, priced at £550 found 2 days ago
Scandinavian Airlines
Sat, 30 May - Sun, 31 May
LHR
London
SEA
Seattle
£558 Return, found 6 days ago
£558
Return
found 6 days ago
Select Scandinavian Airlines flight, departing Sat, 30 May from London to Seattle, returning Sun, 31 May, priced at £558 found 6 days ago
Air France
Wed, 7 Oct - Wed, 21 Oct
LHR
London
SEA
Seattle
£560 Return, found 1 day ago
£560
Return
found 1 day ago
Select Air France flight, departing Wed, 7 Oct from London to Seattle, returning Wed, 21 Oct, priced at £560 found 1 day ago
Alaska Airlines
Thu, 22 Oct - Thu, 5 Nov
LHR
London
SEA
Seattle
£563 Return, found 1 day ago
£563
Return
found 1 day ago
Select Alaska Airlines flight, departing Thu, 22 Oct from London to Seattle, returning Thu, 5 Nov, priced at £563 found 1 day ago
Virgin Atlantic
Tue, 13 Oct - Tue, 27 Oct
LHR
London
SEA
Seattle
£563 Return, found 2 days ago
£563
Return
found 2 days ago
Select Virgin Atlantic flight, departing Tue, 13 Oct from London to Seattle, returning Tue, 27 Oct, priced at £563 found 2 days ago
British Airways
Wed, 7 Oct - Wed, 21 Oct
LHR
London
SEA
Seattle
£569 Return, found 1 day ago
£569
Return
found 1 day ago
Select British Airways flight, departing Wed, 7 Oct from London to Seattle, returning Wed, 21 Oct, priced at £569 found 1 day ago
American Airlines
Wed, 21 Oct - Mon, 26 Oct
LHR
London
SEA
Seattle
£569 Return, found 2 hours ago
£569
Return
found 2 hours ago
Select American Airlines flight, departing Wed, 21 Oct from London to Seattle, returning Mon, 26 Oct, priced at £569 found 2 hours ago
Iberia
Tue, 27 Oct - Thu, 5 Nov
LHR
London
SEA
Seattle
£573 Return, found 3 hours ago
£573
Return
found 3 hours ago
Select Iberia flight, departing Tue, 27 Oct from London to Seattle, returning Thu, 5 Nov, priced at £573 found 3 hours ago

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city centre is 20 minutes. Flights from £709
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city centre20 min
Flights from £709

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

April is typically the cheapest month to fly

From £484 - £865 per traveller.

Frequently asked questions

How much does a flight from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) cost?
One-way flights typically cost between £410 and £2,922 and return flights often range between £535 and £3,420. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Anaa (AAA) to Toronto, ON (YYZ-Pearson Intl.) ticket fares go up or down.
Which airlines fly direct from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Enter LHR to SEA and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
To find a cheap flight from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The best airline to fly with from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) will differ from traveller to traveller. If you like to fly early, BA offers early morning flights. If price is the most important factor, AS typically offers the lowest fares. BA offers the most daily flights from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.), which is brilliant if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
How many flights per day from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
There are approximately 4 nonstop flights per day from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.). For even more choice, look at flights that include layovers. You'll find around 155 connecting flights per day. Some common connection points include Unknown (DUB), Schiphol (AMS), and Frankfurt Intl. (FRA).
What is the earliest flight from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The earliest flight from London Heathrow (LHR) to Seattle - Tacoma Intl. (SEA) typically departs at approximately 6:00 AM local time, operated by British Airways or Aer Lingus. This is a seasonal service active in March. An early departure like this can help maximise your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
You'll typically find the most flights from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) on a Wednesday, with around 105 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include British Airways, United Airlines, and American Airlines.
What are the most popular departure times for flights from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The most popular departure times for flights from London Heathrow (LHR) to Seattle, WA (SEA) are in the morning, from 9am to 12pm. Approximately 35% of passengers prefer this time window. Many major carriers, including British Airways, United Airlines and Virgin Atlantic, offer flights during this window. These times work well because they allow for a comfortable morning departure, getting you to Seattle in the afternoon or early evening.
How long does it take to fly from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
A nonstop flight from LHR to SEA typically takes around 10 hours, covering approximately 4,787 miles. Connecting flights on this route usually add 6 hours 30 minutes to your travel time. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Select the "Business class" and "First class" filters when looking for LHR to SEA flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How much is a business class flight from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
A direct, return business class ticket from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) typically costs between £5,163 - £12,576. A non-stop, one-way business class flight is usually around £9,048 - £10,118. You may also be able to find a cheaper business class journey between London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between Anaa (AAA) (AAA) to Toronto, ON (YYZ-Pearson Intl.) (YYZ) if you opt for a connecting flight.
How do I earn miles on a London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight with Expedia?
It's easy to earn miles on a London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia. *Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Seattle from Heathrow (LHR)?
From Heathrow (LHR), you can fly directly into Seattle - Tacoma Intl. (SEA) to reach Seattle. Some flights may connect through major hubs like Frankfurt Intl. (FRA), Kastrup (CPH), Schiphol (AMS) before reaching Seattle. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) at the last minute?
Typically, booking a last minute flight from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight and hotel package?
Securing a London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
If you booked your London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Heathrow
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Aer Lingus, Air Canada, Air France, Alaska Airlines, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, JetBlue Airways, KLM, Lufthansa, Scandinavian Airlines, Turkish Airlines, United, Virgin Atlantic, WestJet
Return price
£481
Distance
7657 km
Average flight time
2 hours 6 mins

Book with confidence

Compare flights from London to Seattle easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from London to Seattle. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Seattle - Tacoma Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Heathrow to Seattle - Tacoma Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Heathrow (LHR) to Seattle - Tacoma Intl. (SEA)

The easiest way to view the best deals on flights from London to Seattle today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Heathrow to Seattle - Tacoma Intl. start at just £482 and range up to £573.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near London and Seattle
  • booking your flight during October, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your London to Seattle flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Heathrow to Seattle - Tacoma Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from London to Seattle easily and book with confidence

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