Cheap Flights from Seattle (SEAA) to London (LOND)

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Travellers and cabin class, 1 Adult, Economy

Compare Seattle to London flight deals

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

Book the best London fare with no extra fees

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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? If you want to travel next month, return fares start from £323. Find the lowest prices on one-way and return tickets right here.

London.£170 per passenger.Departing Sun, 4 Oct.One-way flight with Scandinavian Airlines.Outbound indirect flight with Scandinavian Airlines, departs from Seattle / Tacoma International on Sun, 4 Oct, arriving in London Stansted.Price includes taxes and charges.From £170, select.

London.£176 per passenger.Departing Sun, 20 Sep.One-way flight with Scandinavian Airlines.Outbound indirect flight with Scandinavian Airlines, departs from Seattle / Tacoma International on Sun, 20 Sep, arriving in London Stansted.Price includes taxes and charges.From £176, select.

London.£197 per passenger.Departing Tue, 20 Apr.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Tue, 20 Apr, arriving in London Heathrow.Price includes taxes and charges.From £197, select.

London.£202 per passenger.Departing Sun, 9 May.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Sun, 9 May, arriving in London Heathrow.Price includes taxes and charges.From £202, select.

London.£203 per passenger.Departing Sun, 8 Nov.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Sun, 8 Nov, arriving in London Gatwick.Price includes taxes and charges.From £203, select.

London.£209 per passenger.Departing Thu, 18 Mar.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Thu, 18 Mar, arriving in London Heathrow.Price includes taxes and charges.From £209, select.

London.£213 per passenger.Departing Sat, 20 Feb.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Sat, 20 Feb, arriving in London Heathrow.Price includes taxes and charges.From £213, select.

London.£215 per passenger.Departing Wed, 30 Dec.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Wed, 30 Dec, arriving in London Gatwick.Price includes taxes and charges.From £215, select.

London.£219 per passenger.Departing Tue, 27 Jul.One-way flight with Air Canada.Outbound indirect flight with Air Canada, departs from Seattle / Tacoma International on Tue, 27 Jul, arriving in London Heathrow.Price includes taxes and charges.From £219, select.

London.£224 per passenger.Departing Wed, 27 Jan.One-way flight with Air Canada.Outbound indirect flight with Air Canada, departs from Seattle / Tacoma International on Wed, 27 Jan, arriving in London Heathrow.Price includes taxes and charges.From £224, select.

London.£225 per passenger.Departing Sat, 14 Aug.One-way flight with Air Canada.Outbound indirect flight with Air Canada, departs from Seattle / Tacoma International on Sat, 14 Aug, arriving in London Heathrow.Price includes taxes and charges.From £225, select.

London.£228 per passenger.Departing Sun, 9 May.One-way flight with Virgin Atlantic.Outbound direct flight with Virgin Atlantic departs from Seattle / Tacoma International on Sun, 9 May, arriving in London Heathrow.Price includes taxes and charges.From £228, select.

London.£230 per passenger.Departing Mon, 19 Jul.One-way flight with British Airways.Outbound direct flight with British Airways departs from Seattle / Tacoma International on Mon, 19 Jul, arriving in London Heathrow.Price includes taxes and charges.From £230, select.

London.£231 per passenger.Departing Wed, 17 Feb.One-way flight with Iberia.Outbound direct flight with Iberia departs from Seattle / Tacoma International on Wed, 17 Feb, arriving in London Heathrow.Price includes taxes and charges.From £231, select.

London.£232 per passenger.Departing Wed, 13 Jan.One-way flight with Iberia.Outbound direct flight with Iberia departs from Seattle / Tacoma International on Wed, 13 Jan, arriving in London Heathrow.Price includes taxes and charges.From £232, select.

London.£232 per passenger.Departing Wed, 7 Apr.One-way flight with British Airways.Outbound direct flight with British Airways departs from Seattle / Tacoma International on Wed, 7 Apr, arriving in London Heathrow.Price includes taxes and charges.From £232, 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	£170
Cheapest month to fly	October
Average flight time	9 hrs, 34 mins
Most popular airline	Alaska Airlines
Average flights per week	310

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 £323. 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 34 minutes is the average flight time from Seattle to London.

Which airlines fly direct from Seattle to London?

Alaska Airlines, Air France and Delta fly direct from Seattle to London.

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

As of September 2026, there are 155 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 October.

Which is the cheapest airport to fly into in London?

If you're flying from Seattle, the cheapest airport near London is London Stansted – which is 30.2 miles away from the centre of London. We've found flights into this airport from £323.

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, 19 October 2026.

Can I get a direct flight from Seattle to London?

Yes – the average flight time is 9 hours and 34 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 September, the average temperature is usually around 16°C. July is typically the warmest month in London, when it usually averages around 23°C. You can expect the least rain in April. The coldest month is January, with temperatures averaging 2°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 Alaska Airlines.

Flight Information

With many routes available several times a day, it’s easy to locate cheap flights from Seattle to London. Direct flights are available on FinnAir, Virgin Atlantic, Delta, British Airways, American Airlines and Aer Lingus.

International travellers flying from Seattle-Tacoma International Airport (SEA) should plan on arriving at the main entrance at least three hours before departure. Be sure to bring a current passport and any other qualifying documents. To get from the main terminal to the South Satellite within the airport, you’ll use the Satellite Transit System (STS), which is one of the oldest people movers in the United States.

If you arrive early enough, you can grab a bite to eat at the Seattle Taproom or stop and get a cup of coffee at Starbucks. For reading material on the flight, look through the best sellers at Hudson Booksellers.

Direct and indirect flights from Seattle to London land at Terminal 5 at London Heathrow Airport (LHR) although flights with one or more stops also land at London Gatwick Airport (LGW). Inside Heathrow, you’ll find free Wi-Fi, the Gordon Ramsay restaurant, and a variety of shops, including Gucci, Fortnum & Mason, and Louis Vuitton.

Upon arrival on flights from Seattle to Heathrow, go to immigration and passport control and proceed through border protection. Travel between the terminals is possible via trains, buses, or a short walk.

Climate and Time Differences

Travellers from Seattle to London both share very similar climates. Summer highs are around 25°C for both cities. Since both cities also experience a lot of rain, travellers should also be sure to pack an umbrella. August is usually the hottest month in London. On the other hand, January is the coolest, with daytime highs around 8°C. In the winter, snow is rare, and temperatures are usually mild enough for sightseeing.

London is eight hours ahead of Seattle. When arriving on cheap flights from Seattle to London, be sure to set your watch to ensure you meet appointments and arrive for dinner reservations on time.

Traveling and Dining in London

London offers a large transportation network for travellers from Seattle to London. Popular double-decker buses are a quick and inexpensive way to move around the city. They also offer sightseeing trips. The London Underground rail network, or The Tube, is one of the most popular methods of travel for locals. This network of trains takes you to and from the city centre quickly and efficiently. If you plan on travelling outside of the city, London’s Overground train network lets you go beyond The Tube. There’s also the option of metered cabs, or you can rent a bike if you prefer to explore the city quickly and get some exercise. There are car rental options available as well.

The cost of a meal in London is approximately 50 percent more expensive, especially if you're staying in central areas. Travel to outside residential neighbourhoods to save money. Choose from local favourites like bangers and mash, a popular sausage and mashed potato dish, or kippers, which is cured herring.