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

View AU$629 flight on Wed, 4 Nov 2026Opens in a new window

Flight 1

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 for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, 29 Sept - Wed, 30 Sept
LHR
London
SEA
Seattle
AU$888 Return, found 1 day ago
AU$888
Return
found 1 day ago
Select United flight, departing Tue, 29 Sept from London to Seattle, returning Wed, 30 Sept, priced at AU$888 found 1 day ago
United
Tue, 29 Sept - Wed, 30 Sept
LHR
London
SEA
Seattle
AU$947 Return, found 1 day ago
AU$947
Return
found 1 day ago
Select United flight, departing Tue, 29 Sept from London to Seattle, returning Wed, 30 Sept, priced at AU$947 found 1 day ago
Icelandair
Wed, 4 Nov - Wed, 11 Nov
LHR
London
SEA
Seattle
AU$960 Return, found 10 hours ago
AU$960
Return
found 10 hours ago
Select Icelandair flight, departing Wed, 4 Nov from London to Seattle, returning Wed, 11 Nov, priced at AU$960 found 10 hours ago
Delta
Thu, 8 Oct - Wed, 21 Oct
LHR
London
SEA
Seattle
AU$1,028 Return, found 6 days ago
AU$1,028
Return
found 6 days ago
Select Delta flight, departing Thu, 8 Oct from London to Seattle, returning Wed, 21 Oct, priced at AU$1,028 found 6 days ago
Alaska Airlines
Thu, 8 Oct - Wed, 21 Oct
LHR
London
SEA
Seattle
AU$1,035 Return, found 6 days ago
AU$1,035
Return
found 6 days ago
Select Alaska Airlines flight, departing Thu, 8 Oct from London to Seattle, returning Wed, 21 Oct, priced at AU$1,035 found 6 days ago
Virgin Atlantic
Sat, 24 Oct - Fri, 6 Nov
LHR
London
SEA
Seattle
AU$1,053 Return, found 1 day ago
AU$1,053
Return
found 1 day ago
Select Virgin Atlantic flight, departing Sat, 24 Oct from London to Seattle, returning Fri, 6 Nov, priced at AU$1,053 found 1 day ago
Air Canada
Mon, 28 Sept - Mon, 5 Oct
LHR
London
SEA
Seattle
AU$1,060 Return, found 5 days ago
AU$1,060
Return
found 5 days ago
Select Air Canada flight, departing Mon, 28 Sept from London to Seattle, returning Mon, 5 Oct, priced at AU$1,060 found 5 days ago
Lufthansa
Wed, 4 Nov - Wed, 11 Nov
LHR
London
SEA
Seattle
AU$1,075 Return, found 10 hours ago
AU$1,075
Return
found 10 hours ago
Select Lufthansa flight, departing Wed, 4 Nov from London to Seattle, returning Wed, 11 Nov, priced at AU$1,075 found 10 hours ago
American Airlines
Wed, 4 Nov - Wed, 11 Nov
LHR
London
SEA
Seattle
AU$1,089 Return, found 10 hours ago
AU$1,089
Return
found 10 hours ago
Select American Airlines flight, departing Wed, 4 Nov from London to Seattle, returning Wed, 11 Nov, priced at AU$1,089 found 10 hours ago
Austrian Airlines
Wed, 4 Nov - Wed, 11 Nov
LHR
London
SEA
Seattle
AU$1,129 Return, found 10 hours ago
AU$1,129
Return
found 10 hours ago
Select Austrian Airlines flight, departing Wed, 4 Nov from London to Seattle, returning Wed, 11 Nov, priced at AU$1,129 found 10 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 AU$1,191
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city centre20 min
Flights from AU$1,191

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

February is typically the cheapest month to fly

From AU$881 - AU$1,063 per traveller.

Frequently asked questions

How much does a flight from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) cost?
You can find cheap one-way flights from AU$629 and cheap return flights from AU$888 LHR to SEA with Expedia. One-way flights typically cost between AU$800 and AU$5,459 and return flights often range between AU$1,091 and AU$6,498. 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 LHR to SEA ticket fares go up or down.
What is the cheapest month to fly from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The cheapest months to fly from LHR to SEA are typically during off-peak season when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you are able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
There are 3 airlines offering direct flights from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.). Here are the carriers:
  • British Airways operates 15 direct flights from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) every week.
  • Virgin Atlantic operates 7 direct flights from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) every week.
  • Delta operates 7 direct flights from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) every week.
What is the cheapest airline that flies from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Delta is one of the cheapest airlines offering nonstop return flights from London Heathrow (LHR) to Seattle - Tacoma Intl. (SEA), with tickets starting from around AU$1225 for flights that can be booked for departure within the next year. WestJet offers one of the cheapest connecting return flights from London Heathrow (LHR) to Seattle - Tacoma Intl. (SEA) starting from around AU$1515. These prices are per adult for economy/coach class. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.
How do I find cheap flights from London (LHR) to Seattle, WA (SEA)?
To find a cheap flight from London (LHR) to Seattle, WA (SEA), 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, British Airways offers early morning flights. If price is the most important factor, Alaska Airlines typically offers the lowest fares. British Airways offers the most daily flights from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.), which is great 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.)?
You'll find approximately 4 nonstop flights per day from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.). For even more choices, look at flights that include layovers; there are around 192 connecting flights per day. Some common connection points include Dublin (DUB), Schiphol (AMS), and John F. Kennedy Intl. (JFK).
What is the earliest flight from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The earliest flight from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) typically departs around 6:00 AM. This service is seasonal, active only in March, and is operated by airlines such as British Airways and Aer Lingus. An early departure like this can help you make the most of 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 Heathrow (LHR) to Seattle - Tacoma Intl. (SEA) on a Monday, with around 111 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include British Airways, United, and American Airlines. Flight options are notably more abundant on Mondays compared to other days of the week, offering you greater flexibility.
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 - Tacoma Intl. (SEA) are between 9am and 12pm. Many major carriers, including British Airways, Virgin Atlantic and United, offer flights during this window. Many travellers prefer these times as they allow for a morning departure, giving you a full day to settle in once you arrive in Seattle.
How long does it take to fly from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
A nonstop flight from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.) typically takes around 10 hours. This route covers a distance of approximately 7,703 kilometres. If you opt for a one-stop flight, your travel time will be longer, usually around 16 hours 30 minutes. Flights with two or more stops will take even longer, averaging about 20 hours 18 minutes. Keep in mind that actual flight times can vary due to factors like wind patterns and air traffic, so it's always a good idea to allow for some extra time when planning your journey.
Can you fly business or first class from London (LHR-Heathrow) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
You can fly business class or first class between LHR and SEA. Airlines that offer business class service on this route include:

  • Lufthansa
  • Air France
  • Icelandair
  • ITA Airways
  • SAS
  • Air Baltic
  • Swiss International Air Lines
  • British Airways
  • Turkish Airlines
  • KLM
  • Singapore Airlines
  • Delta
  • Air Canada
  • Med View Airlines
  • American Airlines
  • Alaska Airlines
  • United
  • Finnair
  • Virgin Atlantic

First class cabins are available on British Airways and American Airlines.
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, WA (SEA) from London (LHR)?
If you're planning to travel to Seattle from Heathrow (LHR), you can fly directly into Seattle - Tacoma Intl. (SEA). Some flights may connect through major hubs like Kastrup (CPH), Frankfurt Intl. (FRA), or 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) to Seattle, WA (SEA)?
If you booked your London (LHR) to Seattle, WA (SEA) 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, Aeromexico, Air Canada, Air France, Alaska Airlines, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, KLM, Lufthansa, Scandinavian Airlines, Turkish Airlines, United, Virgin Atlantic, WestJet
Roundtrip price
AU$888
Distance
7657 km
Average flight time
2 hours 3 mins

Book with confidence

Your quick guide to flights from London to Seattle

Pick up great flights from London to Seattle

With Expedia, you have your pick of flights a day with 20 airlines covering flights from London to Seattle. Whether you’re on a business trip, a family holiday or a luxury break, just enter your travel dates, hit search then check out your choice of flights. Select from return, one way or multi-city flights, and use the advance search tool if you want a direct or refundable flight. You can narrow your search to show you just your preferred cabin class and airline, too. It’s all easy. You can book direct flights from London to Seattle that take around hours.

Find cheap flights from London to Seattle

From the great flight deals with prices currently ranging from AU$888 to AU$1,129, you can choose to see the cheapest flights first. Generally, you can book the cheapest flights from London to Seattle around 4 to 6 weeks in advance. If your travel dates are flexible, try to avoid weekends and peak seasons – when you are more likely to grab the lowest prices. Even last minute, there are some impressive deals. The cheapest time to fly to Seattle is normally in September.

Reasons to book your flight from London to Seattle with Expedia

Expedia makes it easy to find, book, and travel, with everything you need all in one place. When you enter your travel details, find fantastic deals just for you on flight tickets from London to Seattle across all the main airline carriers, so you can save time, dollars, and hassle finding the perfect flight. If you think your plans could change, choose refundable flights so any changes won’t cost you more. Book your flight to Seattle right now and, if you join Expedia Rewards, you earn points this time and every time you travel with Expedia.

Your quick guide to flights from London to Seattle

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