Cheap Flights from London Heathrow to Seattle

Compare London Heathrow to Seattle flight deals

Find the cheapest month or even day of the year to fly to Seattle

Book the best Seattle fare with no extra fees

Flight deals from London Heathrow to Seattle

Looking for a cheap last-minute deal or the best return flight from London Heathrow to Seattle? Find the lowest prices on one-way and return tickets right here.

Seattle.SAR 1,102 per passenger.Departing Wed, 30 Apr.One-way flight with British Airways.Outbound indirect flight with British Airways, departs from London Heathrow on Wed, 30 Apr, arriving in Seattle / Tacoma International.Price includes taxes and charges.From SAR 1,102, select.

Seattle.SAR 1,171 per passenger.Departing Sat, 3 May.One-way flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from London Heathrow on Sat, 3 May, arriving in Seattle / Tacoma International.Price includes taxes and charges.From SAR 1,171, select.

Seattle.SAR 1,588 per passenger.Departing Tue, 18 Mar.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 18 Mar, arriving in Seattle / Tacoma International.Price includes taxes and charges.From SAR 1,588, select.

Seattle.SAR 1,629 per passenger.Departing Tue, 3 Jun.One-way flight with Vueling Airlines.Outbound indirect flight with Vueling Airlines, departs from London Heathrow on Tue, 3 Jun, arriving in Seattle / Tacoma International.Price includes taxes and charges.From SAR 1,629, select.

Seattle.SAR 1,800 per passenger.Departing Tue, 26 Aug.One-way flight with British Airways.Outbound indirect flight with British Airways, departs from London Heathrow on Tue, 26 Aug, arriving in Seattle / Tacoma International.Price includes taxes and charges.From SAR 1,800, select.

Seattle.SAR 1,853 per passenger.Departing Thu, 11 Sep.One-way flight with British Airways.Outbound indirect flight with British Airways, departs from London Heathrow on Thu, 11 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From SAR 1,853, select.

Seattle.SAR 1,962 per passenger.Departing Wed, 1 Oct.One-way flight with British Airways.Outbound indirect flight with British Airways, departs from London Heathrow on Wed, 1 Oct, arriving in Seattle / Tacoma International.Price includes taxes and charges.From SAR 1,962, select.

Seattle.SAR 2,254 per passenger.Departing Sun, 30 Nov.One-way flight with British Airways.Outbound indirect flight with British Airways, departs from London Heathrow on Sun, 30 Nov, arriving in Seattle / Tacoma International.Price includes taxes and charges.From SAR 2,254, select.

Find the cheapest month to fly from London Heathrow to Seattle

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like London Heathrow to Seattle flights are currently cheapest in April.

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Direct flights from London Heathrow to Seattle

Alternative London Heathrow to Seattle routes

Looking for the cheapest, fastest or easiest route from London Heathrow to Seattle? You could fly into the following airports instead.

London to Seattle: Flight information

The things to know before you go.

Cheapest flight found	SAR 1,102
Cheapest month to fly	April
Average flight time	10 hrs, 8 mins
Most popular airline	KLM
Average flights per week	209

Finding cheap flights from London Heathrow to Seattle: Frequently asked questions

How many airports are there in Seattle?

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.

How much are return flights from London Heathrow to Seattle?

The best price we found for a return flight from London Heathrow to Seattle is SAR 1,357. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from London Heathrow to Seattle?

10 hours and 8 minutes is the average flight time from London Heathrow to Seattle.

Which airlines fly direct from London Heathrow to Seattle?

KLM, Alaska Airlines and Aer Lingus fly direct from London Heathrow to Seattle.

How many flights are there a week from London Heathrow to Seattle?

As of March 2025, there are 209 flights per week flying from London Heathrow to Seattle.

When is the cheapest time to fly from London Heathrow to Seattle?

The cheapest month to fly from London Heathrow to Seattle is usually March 2025.

Which is the cheapest airport to fly into in Seattle?

If you're flying from London Heathrow Airport, the cheapest airport near Seattle is Seattle / Tacoma International – which is 19.5 km away from the centre of Seattle. We've found flights into this airport from SAR 1,357.

Which upcoming date is cheapest to fly from London Heathrow Airport to Seattle on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from London Heathrow Airport to Seattle on Friday, 18 April 2025.

Can I get a direct flight from London Heathrow Airport to Seattle?

Yes – the average flight time is 10 hours and 8 minutes.

How can I get the best flight deal from London Heathrow Airport to Seattle?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Seattle?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.

What’s the weather like in Seattle?

In March, the average temperature is usually around 6°C. August is typically the warmest month in Seattle, when it usually averages around 23°C. You can expect the least rain in July. The coldest month is December, with temperatures averaging 0°C. The rainiest month is November.

Which is the cheapest airline to fly from London Heathrow Airport to Seattle with?

Currently, Austrian Airlines and Air France offer the cheapest flight tickets to Seattle.

How to find cheap flights to Seattle from London Heathrow

Looking for cheap tickets from London Heathrow to Seattle? Here are a few tips on how to secure the best flight price and make your journey as smooth as possible.

Simply hit 'search'. From British Airways to international carriers like Emirates, we compare all major airlines along with the most popular online travel agents to find the cheapest plane tickets from London Heathrow to Seattle. And with us there are no hidden fees - what you see is what you pay.
Compare flight deals to Seattle from London Heathrow from over 1,000 providers. Then choose the cheapest or fastest plane tickets.
Flex your dates to find the best London Heathrow-Seattle ticket prices. If you are flexible when it comes to your travel dates, use Skyscanner's 'Whole month' tool to find the cheapest month, and even day to fly to Seattle from London Heathrow.
Set up a Price Alert. You can easily track the fare of your cheap London Heathrow-Seattle flights by creating an alert. Whenever prices go down or up, you'll get an email or push notification to help make sure you get the best possible flight deal.
Fly without stops. Only interested in direct flights between London Heathrow and Seattle? Make sure to tick 'Direct flights only' when performing a search. If there are direct flights available on the route, these will appear in the results.
Find the cheapest Business class flights from London Heathrow and Seattle. We scour the internet for the best Business, Premium Economy and First Class flight fares to Seattle, too. Check the difference in price as you search – you might just chance upon a last-minute low fare. Note that not all cabin classes are available for every destination or airline.
Include nearby airports in your search. Widen your search for London Heathrow to Seattle flight deals by selecting the "add nearby airports" option. This will allow you to see flight prices for all the nearest airports at your departure point and your destination and could help you save next time you travel.

Combine your flight to Seattle from London Heathrow with hotels and car hire

Once you've secured your cheap flight ticket from London Heathrow to Seattle, discover the best prices and exclusive rates for hotels in Seattle or nearby. You can also compare hundreds of car hire companies in one go so that you get the best car hire price for your trip.