Cheap Flights from London (LOND) to Seattle / Tacoma International (SEA)

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

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Compare flight deals from London to Seattle \u002F Tacoma International from £295

Looking for a cheap last-minute deal or the best return flight from London to Seattle / Tacoma International Airport? If you want to travel next month, return fares start from £457. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from London to Seattle / Tacoma International

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

Direct flights from London to Seattle / Tacoma International

London to Seattle / Tacoma International: Alternative routes

Compare routes from London to Seattle below. You may find an airport to fly into that's cheaper, faster, or easier than Seattle / Tacoma International.

London to Seattle: Flight information

The things to know before you go.
Cheapest flight found£295
Cheapest month to flyMay
Average flight time10 hrs, 14 mins
Most popular airlineKLM
Average flights per week174

Finding cheap flights from London to Seattle / Tacoma International: Frequently asked questions

The best price we found for a return flight from London to Seattle / Tacoma International is £445. 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.
10 hours and 14 minutes is the average flight time from London to Seattle / Tacoma International.
KLM, Alaska Airlines and Virgin Atlantic fly direct from London to Seattle / Tacoma International.
As of April 2026, there are 179 flights per week flying from London to Seattle / Tacoma International.
The cheapest month to fly from London to Seattle / Tacoma International is usually January.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from London to Seattle / Tacoma International Airport on Thursday, 14 January 2027.
Yes – the average flight time is 10 hours and 14 minutes.
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 / Tacoma International 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.

Travelling from London to Seattle-Tacoma International Airport (SEA): What you need to know

  • Planning your getaway begins with figuring out where you'll fly out of in London. London Heathrow Airport (LHR) is the city's main airport, so explore your options for reserving a flight from London to Seattle-Tacoma International Airport (SEA) leaving from here.

  • 10 hours 5 minutes is the average duration of a direct London to Seattle-Tacoma International Airport flight.

  • Seattle-Tacoma International Airport is located in Seattle. The city runs on the UTC-8 timezone and is eight hours behind London.

  • The busiest route is from London Heathrow Airport (LHR) to Seattle-Tacoma International Airport (SEA), with 25 direct services every week. If you're ready to head out sooner, the earliest flight from LHR to SEA is the 9:25am British Airways service. If you prefer travelling later, the last departure is at 6:30pm with Delta Air Lines.

  • To ensure you get on your flight from London to SEA, allow plenty of time to navigate the airport and find your gate. Turning up two hours before international departures and an hour before domestic flights is the general rule.

  • Travelling during a peak month like July? Public holidays and other popular periods can lead to longer lines and delays at security. Play it safe and get there up to four hours before an international flight and two hours before domestic departures.

Airports in London

London Heathrow Airport (LHR)

  • You can find a direct flight from London to Seattle-Tacoma International Airport (SEA) leaving from London Heathrow Airport (LHR).

  • Pick from a variety of airlines operating direct flights from London to Seattle-Tacoma International Airport leaving from LHR. Head off on your trip with any of these:

  • Most passengers prefer to book seats with British Airways between LHR and SEA.

  • The carrier with the top on-time arrival performance on this route is Delta.

  • Consider adding a stopover to find cheap flights from London to SEA. Simply deselect 'Direct flights only' when browsing departures from London Heathrow Airport (LHR). Break up the journey at one of these popular options:

    • Paris Charles de Gaulle Airport (CDG)

    • Vancouver International Airport (YVR)

    • Keflavik Airport (KEF)

  • Travelling from central London to LHR takes around 25 minutes on public transport. If you drive, ride-share or grab a taxi, you'll cover the 24 kms (15 miles) in 45 minutes or so, depending on traffic.

  • Want an easy start to your travels? Stay near London Heathrow Airport. Whether you have an early flight from London to Seattle-Tacoma International Airport or want to avoid feeling rushed, these hotels offer the perfect solution:

  • Of the flights that depart from London Heathrow Airport, 78% arrive on time at their destination.

London Gatwick Airport (LGW)

  • Squeeze in an extra adventure with a stopover on your flight from London to Seattle-Tacoma International Airport. Here's where you can connect between London Gatwick Airport and SEA:

    • Paris Charles de Gaulle Airport (CDG)

    • Vancouver International Airport (YVR)

    • Keflavik Airport (KEF)

  • LGW is around 48 kms (30 miles) from central London. It'll take you 1 hour 5 minutes or so to get to the airport in a car from the city centre. Public transport takes approximately 1 hour 20 minutes.

  • Want to enjoy an extra night away before boarding your London to SEA flight? Unwind in a hotel near London Gatwick Airport before your adventure officially starts. These stays have your key waiting:

  • Flights from London Gatwick Airport have a track record for punctuality, with 82% of them arriving as planned.

London Stansted Airport (STN)

  • You can reserve a plane ticket from London to Seattle-Tacoma International Airport (SEA) with one or more stops departing from London Stansted Airport (STN). Here are some of the most common stopovers between STN and SEA:

    • Amsterdam Schiphol Airport (AMS)

    • Dublin Airport (DUB)

    • Keflavik Airport (KEF)

  • The journey time to STN from the centre of London is around 45 minutes by public transport. If you're planning to travel by car, it'll take you roughly 1 hour 5 minutes to cover the 56 kms (35 miles) or so.

  • Rest a little longer, move a little slower, and still make your London to Seattle-Tacoma International Airport flight with time to spare. These accommodation options near London Stansted Airport make it a breeze to get to the terminal if you're flying out early:

  • STN has an on-time performance rate of 80%. This means most of its flights touch down as expected and your plans go off without a hitch.

About Seattle-Tacoma International Airport (SEA)

Getting from Seattle-Tacoma International Airport (SEA) to central Seattle

  • From Seattle-Tacoma International Airport, central Seattle is around 23 kms (14 miles) away. It takes about 25 minutes to get to the city centre by car.

  • When travelling by public transport, expect a journey time of about 35 minutes.

How to find the cheapest flights from London to Seattle-Tacoma International Airport (SEA)

  • The cheapest price we've found for a one-way ticket from London to Seattle-Tacoma International Airport is £295. For a return flight on this route, the best price is £445. Depending on how early you book and the availability, these fares could change.

  • Booking early is often the key to scoring a cheap flight from London to SEA. Airlines adjust prices based on demand, so the closer your departure date, the more it could cost you.

  • The 'Whole month' search tool shows you the cheapest London to Seattle-Tacoma International Airport tickets throughout the month. It's a great way to find a bargain if your plans aren't set in stone.

  • You don't need to check every day to find out if fares have dropped when you set up a Price Alert. We'll let you know as soon as a better deal is available on plane tickets from London to SEA.

  • Lock in a cheap flight from London to Seattle-Tacoma International Airport by using filters. Select your ideal duration, number of stops and airlines, then sort the results by 'Cheapest' for the best deals.

The best time to fly from London to Seattle-Tacoma International Airport (SEA)

  • December is the quietest month for flights from London to Seattle-Tacoma International Airport (SEA), while July is the busiest. Choose the ideal time to go to Seattle based on whether you want a laid-back vibe or a lively atmosphere.

  • Book a London to SEA plane ticket departing in August if you're eager to visit the city during its warmest month. Expect temperatures in Seattle to range from 12ºC to 28ºC.

  • If you want cooler conditions, search for a cheap ticket from London to Seattle-Tacoma International Airport in February when temperatures are between -1ºC and 11ºC.

More about Seattle

  • When it comes to searching for somewhere to lay your head, you'll find the best places to stay in Seattle right here. Check out these hotels once you've locked in your flight from London to Seattle-Tacoma International Airport:

  • Space Needle and Pike Place Market are just the start of the big attractions to put on your Seattle travel itinerary. Continue your sightseeing adventures at Seattle Skyline.

Explore more of the United States

  • Portland is just one of the many places in the United States waiting to be explored after you've experienced Seattle. Around 209 kms (130 miles) away to the south, check out popular attractions including Portland Japanese Garden, Peninsula Park Rose Garden and Beyond Van Gogh Portland.

  • Around 209 kms (130 miles) south of Seattle, Vancouver is another favourite stop in the United States. No visit is complete without checking out Reconstructed HBC Fort Vancouver, The Marshall House: Victorian Jewel of Officers Row and Clark County Historical Museum.

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