$420 Cheap Flights from London (LHR) to Seattle (SEA)

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Cheap Flights from London to Seattle (LHR-SEA)

Prices were available within the past 7 days and start at $420 for one-way flights and $556 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Icelandair
Mon, Nov 11 - Fri, Nov 15
LHR
London
SEA
Seattle
$556 Roundtrip, found 4 hours ago
$556
Roundtrip
found 4 hours ago
Select Icelandair flight, departing Mon, Nov 11 from London to Seattle, returning Fri, Nov 15, priced at $556 found 4 hours ago
Virgin Atlantic
Wed, Nov 20 - Wed, Dec 4
LHR
London
SEA
Seattle
$619 Roundtrip, found 4 days ago
$619
Roundtrip
found 4 days ago
Select Virgin Atlantic flight, departing Wed, Nov 20 from London to Seattle, returning Wed, Dec 4, priced at $619 found 4 days ago
Delta
Wed, Mar 5 - Tue, Mar 18
LHR
London
SEA
Seattle
$620 Roundtrip, found 1 day ago
$620
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Mar 5 from London to Seattle, returning Tue, Mar 18, priced at $620 found 1 day ago
British Airways
Wed, Nov 6 - Thu, Nov 14
LHR
London
SEA
Seattle
$622 Roundtrip, found 2 days ago
$622
Roundtrip
found 2 days ago
Select British Airways flight, departing Wed, Nov 6 from London to Seattle, returning Thu, Nov 14, priced at $622 found 2 days ago
Iberia
Wed, Nov 27 - Mon, Dec 30
LHR
London
SEA
Seattle
$624 Roundtrip, found 6 hours ago
$624
Roundtrip
found 6 hours ago
Select Iberia flight, departing Wed, Nov 27 from London to Seattle, returning Mon, Dec 30, priced at $624 found 6 hours ago
Lufthansa
Tue, Nov 5 - Wed, Nov 27
LHR
London
SEA
Seattle
$628 Roundtrip, found 1 day ago
$628
Roundtrip
found 1 day ago
Select Lufthansa flight, departing Tue, Nov 5 from London to Seattle, returning Wed, Nov 27, priced at $628 found 1 day ago
United
Wed, Dec 4 - Mon, Dec 9
LHR
London
SEA
Seattle
$629 Roundtrip, found 3 days ago
$629
Roundtrip
found 3 days ago
Select United flight, departing Wed, Dec 4 from London to Seattle, returning Mon, Dec 9, priced at $629 found 3 days ago
Air Canada
Mon, Oct 28 - Tue, Nov 26
LHR
London
SEA
Seattle
$637 Roundtrip, found 2 days ago
$637
Roundtrip
found 2 days ago
Select Air Canada flight, departing Mon, Oct 28 from London to Seattle, returning Tue, Nov 26, priced at $637 found 2 days ago
American Airlines
Wed, Mar 5 - Tue, Mar 18
LHR
London
SEA
Seattle
$638 Roundtrip, found 1 day ago
$638
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Mar 5 from London to Seattle, returning Tue, Mar 18, priced at $638 found 1 day ago
Austrian Airlines
Wed, Sep 25 - Mon, Sep 30
LHR
London
SEA
Seattle
$651 Roundtrip, found 2 days ago
$651
Roundtrip
found 2 days ago
Select Austrian Airlines flight, departing Wed, Sep 25 from London to Seattle, returning Mon, Sep 30, priced at $651 found 2 days ago
Flights from London (LHR) to Seattle (SEA)
Origin airport
Heathrow
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, JetBlue Airways, KLM, Lufthansa, Swiss International Air Lines, Turkish Airlines, United, Virgin Atlantic, WestJet
Roundtrip price
$556
Distance
4786 mi
Average flight time
1 hour 58 mins

London to Seattle Flights

Whether you’re looking for a grand adventure or just want to get away for a last-minute break, flights from London to Seattle offer the perfect respite. Not only does exploring Seattle provide the chance to make some magical memories, dip into delectable dishes, and tour the local landmarks, but the cheap airfare means you won’t bust your budget. So no matter whether your ideal itinerary involves flying one way, non-stop, or round trip, you’re bound to find flights that match your schedule on Expedia, and at prices that won’t shock your wallet.

Bagging a cheap flight from London to Seattle may mean more dollars to spend on for one-of-a-kind souvenirs when you arrive, but it doesn’t mean you have to skimp on your travel experience, as Expedia offers a sizzling selection of cheap airlines that’ll put you in your happy place on their planes, whether that’s getting lost in a hair-raising airport thriller, dreaming on the passing landscape over a glass of bubbly, or jotting down your vacation bucket list at 38,000 feet. There’s also bound to be plenty of opportunities to snap a few photos of the high life that will make your friends green with envy. After all, enjoying the journey is part of the fun.

With so many affordable flights and so many wonderful adventures awaiting you, there’s no reason to put off booking a fantastic flight from LHR to SEA today. So don’t leave it to the last minute to make your dream trip a reality: pack your bags with your go-to travel accessories, put together your list of must-see attractions and can’t-miss activities, and get ready to broaden your horizons – with Expedia, the wonders of Seattle are only a plane trip away. Book your travel arrangements with us today!

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 $420 now!

Frequently asked questions

How much is a one-way flight from London Heathrow to Seattle - Tacoma Intl. Airport (SEA)?
Prepare to snap up a bargain, because one-way London flights to Seattle start from only $487. This info is based on the cheapest fare found on Expedia for this route with a departure date during the next three months. This airfare is for an WestJet flight, departing Heathrow Airport (LHR) on June 4 2024 and landing at Sea-Tac Airport. This price was last updated on May 15 2024 and has not changed since.
How long does it take to fly from Heathrow Airport to Seattle - Tacoma Intl. Airport (SEA)?
With British Airways, a direct flight takes around 9 hours and 45 minutes. Step on board the 9:50AM flight from LHR and arrive at SEA at 11:35AM. Grab an awesome deal on this and other routes when you book your ticket with Expedia.
Is it cheaper to buy a plane ticket from London Heathrow to Seattle - Tacoma Intl. Airport (SEA) last minute?
When it comes to booking your flights, it’s always better to be prepared. While you may be able to find a deal on a Heathrow Airport to Sea-Tac Airport flight at the last minute, prices usually don’t get cheaper as the departure date nears. Based on flight pricing and demand studies in 2022, we have found that the sweet spot to book a domestic flight is between 28 – 35 days in advance. For international journeys it’s between three and four months.
What is the cheapest airline flying from Heathrow Airport to Sea-Tac Airport in the next 90 days?
The cheapest carrier flying from London to Seattle found on Expedia is WestJet, which has fares starting from $487. This price is based on fares found on Expedia with a departure date within the next 90 days. The flight departs Heathrow Airport (LHR) on June 4 2024 and lands at Seattle - Tacoma Intl. Airport (SEA). The pricing information was updated on May 15 2024 and has not changed since.
What's the cheapest price for a flight from LHR to Sea-Tac Airport next month?
The best price for a one-way flight from London to Seattle over the next month is $487. If you want to travel soon, now’s the time to book. This ticket price was found after looking at all available flights on Expedia with a departure date within the next 30 days. This fare is for a one-way WestJet flight leaving Heathrow Airport on June 4 2024 and touching down at Sea-Tac Airport. Pricing info was updated on May 15 2024 and has not changed since.
What airline has the least delays from LHR to Sea-Tac Airport?
Recording an on-time performance of 93%, Delta Air Lines is the carrier that’s likelier to get you from London Heathrow to Sea-Tac Airport without any holdups. Flight delays can be an excuse to linger longer at the airport bar. However, they can also result in a missed connection that upends your entire journey. You can prepare for delays by looking up your flight status through the free Expedia App before heading to the airport. If you’re already there and the delay will significantly affect your plans, visit the customer service desk to find out your next steps.
Can I find cheap nonstop flights from Heathrow Airport (LHR) to Sea-Tac Airport in the next three months?
Get ready to save some money because we’ve come across a roundtrip nonstop flight with Virgin Atlantic within the next 90 days for $690. The price was last updated on May 15 2024 and was found after looking at all available flights on Expedia with a departure date in the next three months. This flight from London to Seattle leaves Heathrow Airport (LHR) on May 29 2024 and arrives at Sea-Tac Airport. The flight’s return date is March 25 2025.It’s a cinch to find nonstop cheap flights from LHR to SEA by making use of our filters. Start by keying in the details of your journey, then press on “Nonstop” under “Filter by” on the left-hand side of the page. Your results will be listed with the lowest-priced fare first. If you don’t need to fly on a certain day, use our “Flexible dates” feature. This lets you compare ticket prices on surrounding days and score the best possible deal.
What airports do you fly into for Seattle from London?
From London, you can travel to Seattle via Seattle - Tacoma Intl. Airport (SEA), Renton Municipal Airport (RNT) and Boeing Field Airport (BFI). Research which hub is the best option for you before making your decision. If you decide to land at Seattle - Tacoma Intl. Airport (SEA), it’s roughly 12 mi south of downtown. Use the money you save when booking your fare with Expedia to explore the city’s well-known attractions, such as Space Needle and Pike Place Market.
What are the most popular departure times for flights from Heathrow Airport (LHR) to Sea-Tac Airport?
Between 12:00 PM - 1:00 PM is when you’ll find lots of Virgin Atlantic flights jetting from London Heathrow to Sea-Tac Airport. Our tip? Fly out early. With air traffic yet to build up around airports, your chances of catching a delay-free flight are higher.
Can I change the date of my flight from LHR to Sea-Tac Airport?
Life can throw a spanner in your plans, so Expedia is here to help make things easy. First, access your Heathrow Airport to Seattle - Tacoma Intl. Airport (SEA) itinerary through the Expedia Trips portal and check the fare conditions regarding changes. If you booked your airfare in the last 24 hours, some carriers will let you cancel at no cost and organize new flights. If you bought your ticket more than 24 hours ago, contact us through our Customer Service portal to find out what your options are.
Seattle nearby Airports

Seattle Paine Field Intl. Airport

London to Seattle Paine Field Intl. Airport
$744.36
London nearby Airports

London

Gatwick to Seattle
$553.40
London City to Seattle
$708.20
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