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

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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 $770. Find the lowest prices on one-way and return tickets right here.

London.$770 per passenger.Departing Sun, 16 Aug, returning Sun, 23 Aug.Return flight with Air Canada and Ryanair.Outbound indirect flight with Air Canada, departs from Seattle / Tacoma International on Sun, 16 Aug, arriving in London Stansted.Inbound indirect flight with Ryanair, departs from London Stansted on Sun, 23 Aug, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $770, select.

London.$894 per passenger.Departing Thu, 3 Sep, returning Mon, 14 Sep.Return flight with Icelandair and Wizz Air UK.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Thu, 3 Sep, arriving in London Stansted.Inbound indirect flight with Wizz Air UK, departs from London Luton on Mon, 14 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $894, select.

London.$942 per passenger.Departing Wed, 14 Oct, returning Tue, 20 Oct.Return flight with Condor.Outbound indirect flight with Condor, departs from Seattle / Tacoma International on Wed, 14 Oct, arriving in London Gatwick.Inbound indirect flight with Condor, departs from London Gatwick on Tue, 20 Oct, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $942, select.

London.$976 per passenger.Departing Thu, 19 Nov, returning Sun, 6 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Thu, 19 Nov, arriving in London Gatwick.Inbound indirect flight with Icelandair, departs from London Gatwick on Sun, 6 Dec, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $976, select.

London.$983 per passenger.Departing Thu, 19 Nov, returning Thu, 26 Nov.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Thu, 19 Nov, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Thu, 26 Nov, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $983, select.

London.$997 per passenger.Departing Tue, 29 Sep, returning Tue, 13 Oct.Return flight with Condor.Outbound indirect flight with Condor, departs from Seattle / Tacoma International on Tue, 29 Sep, arriving in London Gatwick.Inbound indirect flight with Condor, departs from London Gatwick on Tue, 13 Oct, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $997, select.

London.$1,048 per passenger.Departing Fri, 25 Dec, returning Wed, 30 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Fri, 25 Dec, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Gatwick on Wed, 30 Dec, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $1,048, select.

London.$1,051 per passenger.Departing Wed, 16 Dec, returning Wed, 6 Jan.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Wed, 16 Dec, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Wed, 6 Jan, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $1,051, select.

London.$1,052 per passenger.Departing Mon, 13 Jul, returning Tue, 1 Sep.Return flight with Condor.Outbound indirect flight with Condor, departs from Seattle / Tacoma International on Mon, 13 Jul, arriving in London Gatwick.Inbound indirect flight with Condor, departs from London Gatwick on Tue, 1 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $1,052, select.

London.$1,052 per passenger.Departing Mon, 13 Jul, returning Mon, 31 Aug.Return flight with Condor.Outbound indirect flight with Condor, departs from Seattle / Tacoma International on Mon, 13 Jul, arriving in London Gatwick.Inbound indirect flight with Condor, departs from London Gatwick on Mon, 31 Aug, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $1,052, select.

London.$1,055 per passenger.Departing Tue, 20 Oct, returning Tue, 3 Nov.Return flight with Condor.Outbound indirect flight with Condor, departs from Seattle / Tacoma International on Tue, 20 Oct, arriving in London Gatwick.Inbound indirect flight with Condor, departs from London Gatwick on Tue, 3 Nov, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $1,055, select.

London.$1,059 per passenger.Departing Sat, 2 Jan, returning Sat, 9 Jan.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Sat, 2 Jan, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Sat, 9 Jan, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $1,059, select.

London.$1,062 per passenger.Departing Wed, 3 Feb, returning Wed, 10 Feb.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Wed, 3 Feb, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Wed, 10 Feb, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $1,062, select.

London.$1,062 per passenger.Departing Thu, 15 Oct, returning Thu, 10 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Thu, 15 Oct, arriving in London Gatwick.Inbound indirect flight with Icelandair, departs from London Heathrow on Thu, 10 Dec, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $1,062, select.

London.$1,063 per passenger.Departing Tue, 9 Mar, returning Tue, 16 Mar.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Tue, 9 Mar, arriving in London Gatwick.Inbound indirect flight with Icelandair, departs from London Gatwick on Tue, 16 Mar, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $1,063, select.

London.$1,064 per passenger.Departing Tue, 1 Dec, returning Tue, 9 Mar.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Tue, 1 Dec, arriving in London Gatwick.Inbound indirect flight with Icelandair, departs from London Heathrow on Tue, 9 Mar, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $1,064, 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 August.

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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	$770
Cheapest month to fly	August
Average flight time	9 hrs, 36 mins
Most popular airline	Alaska Airlines
Average flights per week	148

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 $770. 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 36 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 July 2026, there are 148 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 August.

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 48.7 km away from the centre of London. We've found flights into this airport from $770.

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 Sunday, 16 August 2026.

Can I get a direct flight from Seattle to London?

Yes – the average flight time is 9 hours and 36 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 July, the average temperature is usually around 17°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 Air Canada. And the cheapest airline that flies to London Heathrow Airport is Alaska Airlines.

Travelling from Seattle to London: what you need to know

There are a couple of main airports you can start your journey from in Seattle. Check out your options departing from Seattle / Tacoma International Airport (SEA) or Seattle Lake Union SPB Airport (LKE) when planning your flight from Seattle to London.
London has a range of airports you can fly into. Land at London Heathrow Airport (LHR), London Gatwick Airport (LGW) or London Stansted Airport (STN). Alternatively, arrive at London Luton Airport (LTN) or London City Airport (LCY).
Around 9 hours 30 minutes is how long you can expect to be travelling on a direct Seattle to London flight.
London's timezone is UTC+0, which makes London eight hours ahead of Seattle.
Seattle / Tacoma International Airport (SEA) to London Heathrow Airport (LHR) is the most popular route. When looking for your flight from Seattle to London, you can pick from 31 services a week between SEA and LHR.
For a smooth journey, turn up at the airport two hours ahead of international flights and an hour before domestic departures. That way, you won't have to rush to board your Seattle to London flight.
Travelling during a peak month such as July? School holidays and other popular periods can lead to longer lines at check-in and security. Play it safe and get there up to four hours ahead of international flights and two hours before domestic departures.

How to find the cheapest flights from Seattle to London

Book six months before you want to fly. Pricing trends suggest that this is the ideal window for finding cheap Seattle to London flights.
November is the best month for nabbing a fantastic deal on a plane ticket from Seattle to London. If you'd like to travel at a different time of year, the 'Whole month' tool will give you the lowest prices for every month.
There's no need to check back in every day to find out if prices have dropped when you create a Price Alert. We'll update you as soon as a better deal comes up on cheap flights from Seattle to London.
Find a cheap Seattle to London flight with the help of our filters. Choose your ideal departure time, duration and airlines, then sort the results by 'Cheapest' for the best deals.

Flying from Seattle

Seattle / Tacoma International Airport (SEA)

You can catch a direct flight from Seattle to London jetting off from Seattle / Tacoma International Airport (SEA). Start your journey at SEA and come in for landing at London Heathrow Airport (LHR).
Choose from a variety of airlines offering direct Seattle to London plane tickets with departures from SEA, including:
Stopovers are the perfect opportunity to take a break from travelling — and maybe even visit a new city. When searching for Seattle to London flights departing from Seattle / Tacoma International Airport, deselect the 'Direct flights only' box to see where you can stop along the way. Here are some options to consider:
- Amsterdam Schiphol Airport (AMS)
- Frankfurt am Main Airport (FRA)
- Paris Charles de Gaulle Airport (CDG)
Travelling from central Seattle to SEA takes about 35 minutes by public transport. If you ride-share, drive or take a taxi, you'll cover the 19 kilometres in 25 minutes or so, depending on traffic.
Planning to catch an early flight from Seattle to London? Avoid the last-minute rush to the terminal (and enjoy a little extra shut-eye) by choosing one of these hotels close to Seattle / Tacoma International Airport:
80% of flights departing from Seattle / Tacoma International Airport arrive at their destination on schedule. Given its solid on-time performance, disruptions are unlikely when taking off from SEA.

Arriving in London

London Heathrow Airport (LHR)

London Heathrow Airport (LHR) to central London takes around 45 minutes to reach by car. The centre is roughly 26 kilometres away.
It typically takes 25 minutes to get there on public transport.
The last thing you need is a lengthy journey to your hotel if you're getting in late on a flight from Seattle to London. Check in to one of these accommodation options near LHR instead:
Travel at your own pace with a London Heathrow Airport rental car. Book your wheels from Surprice, U-Save or Green Motion and discover more of London and beyond.
Lock in the best deal by booking your vehicle from London Heathrow Airport around one week ahead of your trip.

London Gatwick Airport (LGW)

London Gatwick Airport (LGW) is about 40 kilometres from the centre of London. Once you've disembarked your flight from Seattle to London, it takes approximately 1 hour 5 minutes to reach the heart of the city in a taxi or ride-share.
If you choose to travel on public transport, the journey will take you 45 minutes or so.
There are some great places ready to welcome you near LGW. Tuck yourself in after your Seattle to London flight at one of these perfectly located options:
Forget about public transport timetables or waiting in a long taxi line. Pick up a London Gatwick Airport rental car and take your journey in whatever direction you like. Compare offers from Green Motion, U-Save and Drivalia.
Avoid paying extra. Booking your ride three weeks ahead of your arrival at LGW can get you a lower rate.

London Stansted Airport (STN)

Head to the city centre after your flight from Seattle to London has arrived. Central London is around 48 kilometres from London Stansted Airport (STN) and takes roughly 1 hour 5 minutes to reach by car.
The journey takes around 45 minutes when travelling on public transport.
If you don't want to travel into the centre, choose a hotel near STN. Make yourself comfortable at one of these options after your Seattle to London flight:
Whether you want a mini for a solo getaway or a roomy SUV to fit the whole crew comfortably, you'll find the right London Stansted Airport rental car for you. Explore wheels available here from providers such as Green Motion, Drivalia and Europcar.
Around four weeks before your flight from Seattle to London is a good time to secure your ride from STN. You're more likely to land a better deal or catch some early booking discounts.

Best time to go to London

July is the busiest month for flights from Seattle to London. To avoid the crowds, go to London in March.
Before locking in your Seattle to London tickets, consider the kind of weather you prefer. July is the warmest month in London, with temperatures ranging from 11ºC (52ºF) to 26ºC (79ºF).
Search for cheap flights from Seattle to London in January if you'd rather travel when it's cooler. Temperatures are at their lowest then, ranging between 0ºC (32ºF) and 9ºC (48ºF) on average.

More about London

Once you've booked your flight from Seattle to London, choose a hotel that puts you where you want to be. Make one of these options your base for exploring London:
All great journeys should include a little sightseeing. The British Museum, Westminster Abbey and Big Ben are essential stops on your London itinerary.

Explore more of the United Kingdom

You've visited London, now it's time to discover other corners of the United Kingdom. Travel about 257 kilometres northwest to Manchester to tick off its must-visit sights. From Manchester United Museum & Stadium Tour to The Homes of Football and Science and Industry Museum, you'll have a packed itinerary ahead.
Birmingham is another favourite destination in the United Kingdom and is around 161 kilometres northwest of London. No trip is complete without dropping by Birmingham Museum & Art Gallery, Birmingham Hippodrome and Bournville Experience.