340 € Cheap Flights from London to Seattle

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Flight deals from London Airport to Seattle

Looking for a cheap last-minute deal or the best return flight from London Airport to Seattle? If you want to travel next month, return fares start from 405 €. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from London to Seattle

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

London to Seattle: Flight information

The things to know before you go.
Cheapest flight found138 €
Cheapest month to flyApril

Finding cheap flights from London to Seattle: Frequently asked questions

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.
The best price we found for a return flight from London to Seattle is 340 €. 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.
Currently, there are no airlines that fly direct from London to Seattle. But we found flights with one or more stops from 340 €.
As of April 2026, there are no flights flying from London to Seattle.
The cheapest month to fly from London to Seattle is usually July.
If you're flying from London 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 340 €.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from London Airport to Seattle on Thursday, 16 July 2026.
No airlines currently offer direct flights between London Airport and Seattle. Most routes have one or more stops.
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.
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.
In April, the average temperature is usually around 8°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.
Currently, WestJet offers the cheapest flight tickets to Seattle.

Travelling from London International Airport (YXU) to Seattle: what you need to know

  • Seattle is three hours behind London, where London International Airport is located. Seattle observes the UTC-7 timezone.

  • For a stress-free journey, turn up at the airport two hours ahead of international flights and an hour before domestic departures. That way, you can comfortably catch your YXU to Seattle flight.

  • Be prepared for longer queues during popular months like August. Arriving up to four hours ahead of an international flight and two hours for domestic departures is a good idea.

  • Located around 10 kilometres from the centre of London, YXU can be reached in about 20 minutes by car. Travelling on public transport takes roughly 55 minutes.

  • In search of a hotel near YXU? If you've booked an early flight from London International Airport to Seattle, these accommodation options will put you moments from your departure lounge:

  • When it comes to London International Airport's on-time performance, data shows 50.41% of flights meet their scheduled arrival time.

How to find the cheapest flights from London International Airport (YXU) to Seattle

  • 138 € is currently the best price for a one-way London International Airport to Seattle flight. Return plane tickets start from 340 €. These prices may change based on demand.

  • Booking early is often the key to locking in a cheap flight from YXU to Seattle. Fares tend to rise as seats fill up, so the nearer your departure date, the more expensive your ticket may be.

  • The 'Whole month' search tool will show you the cheapest tickets from London International Airport to Seattle across the month. It's a great way to find a bargain if your travel dates are flexible.

  • Locking in a cheap flight from YXU to Seattle is a breeze with Price Alerts. Simply set up one of these automatic notifications and we'll let you know as soon as there's a better deal.

  • Pick your ideal arrival and departure times, number of stops and airlines with our filters. Then, sort the results for your flight from London International Airport to Seattle by 'Best,' 'Cheapest' or 'Fastest.'

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • Seattle-Tacoma International Airport (SEA) is around 23 kilometres from the centre of Seattle. If you're grabbing a cab or a ride-share, the drive will take roughly 20 minutes.

  • It takes around 55 minutes if you're travelling by public transport.

  • Consider booking a hotel close to SEA if you're coming in on a late flight from London International Airport to Seattle. Select one of these accommodation options and make arrival day easier:

  • Pick up a Seattle-Tacoma International Airport rental car and explore Seattle and beyond with your own wheels. Thrifty, Europcar and Budget are top outlets to choose from here.

  • To lock in the lowest price, book your ride from Seattle-Tacoma International Airport around one week in advance of your flight from YXU to Seattle.

Lake Union Sea Plane Base Airport (LKE)

  • Lake Union Sea Plane Base Airport (LKE) is roughly 3 kilometres from central Seattle. Once you've disembarked your flight from London International Airport to Seattle, it'll take you around 10 minutes to reach the heart of the city in a cab or ride-share.

  • Public transport will get you there in about 25 minutes.

  • There are some great places ready to welcome you near LKE. Kick back and get cosy after your YXU to Seattle flight at one of these perfectly located options:

Best time to go to Seattle

  • Carefully consider your dates before booking your flight from London International Airport to Seattle. The city buzzes during peak season, but rates are generally higher and major attractions can get crowded. Visit Seattle in low season if you prefer a more relaxed vibe.

  • Lock in a London International Airport to Seattle plane ticket with a departure in August if you're eager to visit the city during its warmest month. You can expect temperatures to range from 12ºC (54ºF) to 28ºC (82ºF).

  • Look for cheap tickets from YXU to Seattle in February if you'd rather travel when it's cooler. Temperatures are at their lowest then, ranging between -1ºC (30ºF) and 11ºC (52ºF) on average.

More about Seattle

  • When it comes to looking for somewhere to lay your head, you'll find the best places to stay in Seattle right here. Explore these options as soon as you've locked in your flight from London International Airport to Seattle:

  • Every great holiday has to include a little sightseeing. LMN Architects, Greyhound: Bus Station and Boeing Radiation Effects Lab are must-do's during your Seattle adventure.

Explore more of United States

  • Portland is just one of the many places in United States waiting to be discovered once you've taken in the sights of Seattle. Around 241 kilometres away to the south, check out popular attractions including Pioneer Courthouse Square, Portland Japanese Garden and Pittock Mansion.

  • Around 370 kilometres east of Seattle, Spokane is another favourite stop in United States. Start your sightseeing at Manito Park, Northwest Museum of Arts & Culture and Spokane Falls.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.