Cheap Flights from London to Seattle

Compare London to Seattle flight deals

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

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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.

Alternative London to Seattle routes

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

London to Seattle: Flight information

The things to know before you go.
Cheapest flight foundR 2,717
Cheapest month to flyJuly

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 R 5,187. 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 R 5,187.
As of July 2025, there are no flights flying from London to Seattle.
The cheapest month to fly from London to Seattle is usually August.
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 R 5,187.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from London Airport to Seattle on Thursday, 14 August 2025.
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 July, the average temperature is usually around 17°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.

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

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

  • For hassle-free travel, turn up at the airport two hours ahead of international flights and an hour before domestic departures. This leaves you with plenty of time to catch your YXU to Seattle flight.

  • Taking off during a peak time like a bank holiday? Expect longer lines at check-in and security. Play it safe and arrive up to four hours before international flights and two hours ahead of domestic departures.

  • YXU is about 10 kilometres from central London. If you're catching a cab, driving or ride-sharing from the centre, it'll take 20 minutes or so to get there, depending on traffic conditions. If you're planning to take public transport, expect the trip time to be around 55 minutes.

  • Searching for a hotel close to YXU? If you're catching an early flight from London International Airport to Seattle, these accommodation options set you up for a seamless send-off:

  • When it comes to London International Airport's on-time performance, 50.41% of flights arrive within the expected time frame.

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

  • R 2,717 is currently the best price for a one-way London International Airport to Seattle flight. Return flight tickets start from R 5,187. 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 central Seattle. If you're getting a cab or a ride-share, the drive will take roughly 20 minutes.

  • It typically takes 55 minutes when travelling by public transport.

  • Book a hotel near SEA if you're coming in on a late flight from London International Airport to Seattle. Check in to one of these options and make arrival day easier:

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

  • Booking your ride from Seattle-Tacoma International Airport about one week before your flight from YXU to Seattle can help you get the lowest rate.

Lake Union Sea Plane Base Airport (LKE)

  • Once your flight from London International Airport to Seattle has touched down, you can make your way to the city centre in about 10 minutes by car. Central Seattle is roughly 3 kilometres from Lake Union Sea Plane Base Airport (LKE).

  • The journey will take roughly 25 minutes on public transport.

  • You'll find some great places to rest your head close to LKE. Unwind and get cosy after your YXU to Seattle flight at any 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 flight 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

  • Start your Seattle trip right by choosing the ideal place to stay. After booking your flight from London International Airport to Seattle, explore our range of hotels including:

  • All great adventures should include some sightseeing. LMN Architects, Greyhound: Bus Station and Boeing Radiation Effects Lab are essential stops on your Seattle itinerary.

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.