Cheap Flights from Seattle to London

Compare Seattle to London flight deals

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

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Flight deals from Seattle to London

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

London.SAR 829 per passenger.Departing Wed, 15 Oct.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Wed, 15 Oct, arriving in London Gatwick.Price includes taxes and charges.From SAR 829, select.

London.SAR 896 per passenger.Departing Wed, 30 Jul.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Wed, 30 Jul, arriving in London Gatwick.Price includes taxes and charges.From SAR 896, select.

London.SAR 902 per passenger.Departing Mon, 19 May.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Mon, 19 May, arriving in London Heathrow.Price includes taxes and charges.From SAR 902, select.

London.SAR 902 per passenger.Departing Sun, 3 Aug.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Sun, 3 Aug, arriving in London Gatwick.Price includes taxes and charges.From SAR 902, select.

London.SAR 915 per passenger.Departing Sun, 7 Sep.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Sun, 7 Sep, arriving in London Gatwick.Price includes taxes and charges.From SAR 915, select.

London.SAR 962 per passenger.Departing Wed, 11 Jun.One-way flight with WestJet.Outbound indirect flight with WestJet, departs from Seattle / Tacoma International on Wed, 11 Jun, arriving in London Stansted.Price includes taxes and charges.From SAR 962, select.

London.SAR 1,105 per passenger.Departing Sat, 26 Apr.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Sat, 26 Apr, arriving in London Stansted.Price includes taxes and charges.From SAR 1,105, select.

London.SAR 1,331 per passenger.Departing Sun, 16 Nov.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from Seattle / Tacoma International on Sun, 16 Nov, arriving in London Gatwick.Price includes taxes and charges.From SAR 1,331, select.

Find the cheapest month to fly from Seattle to London

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

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Direct flights from Seattle to London

Alternative Seattle to London routes

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

Seattle to London: Flight information

The things to know before you go.

Cheapest flight found	SAR 829
Cheapest month to fly	October
Average flight time	9 hrs, 35 mins
Most popular airline	KLM
Average flights per week	169

Finding cheap flights from Seattle to London: Frequently asked questions

How many airports are there in London?

There are 6 airports in London: London City, London Heathrow, London Gatwick, London Luton, London Stansted, and London Southend.

How much are return flights from Seattle to London?

The best price we found for a return flight from Seattle to London is SAR 2,150. 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 Seattle to London?

9 hours and 35 minutes is the average flight time from Seattle to London.

Which airlines fly direct from Seattle to London?

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

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

As of April 2025, there are 169 flights per week flying from Seattle to London.

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

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

Which is the cheapest airport to fly into in London?

If you're flying from Seattle, the cheapest airport near London is London Gatwick – which is 40.3 km away from the centre of London. We've found flights into this airport from SAR 2,150.

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

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle to London on Monday, 13 October 2025.

Can I get a direct flight from Seattle to London?

Yes – the average flight time is 9 hours and 35 minutes.

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

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 London 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 London?

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

What’s the weather like in London?

In April, the average temperature is usually around 9°C. August is typically the warmest month in London, when it usually averages around 22°C. You can expect the least rain in March. The coldest month is January, with temperatures averaging 1°C. The rainiest month is October.

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

The cheapest airline that flies to London is Icelandair. And the cheapest airline that flies to London Heathrow Airport is Iberia.

How to find cheap flights to London from Seattle

Looking for cheap tickets from Seattle to London? 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 Seattle to London. And with us there are no hidden fees - what you see is what you pay.
Compare flight deals to London from Seattle from over 1,000 providers. Then choose the cheapest or fastest plane tickets.
Flex your dates to find the best Seattle-London 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 London from Seattle.
Set up a Price Alert. You can easily track the fare of your cheap Seattle-London 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 Seattle and London? 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 Seattle and London. We scour the internet for the best Business, Premium Economy and First Class flight fares to London, 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 Seattle to London 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 London from Seattle with hotels and car hire

Once you've secured your cheap flight ticket from Seattle to London, discover the best prices and exclusive rates for hotels in London 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.