Cheap flight tickets from London to Seattle / Tacoma International

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Flight deals from London to Seattle / Tacoma International

Looking for a cheap last-minute deal or the best return flight from London to Seattle / Tacoma International? 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 April.

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 foundRM2,122
Cheapest month to flyApril
Average flight time10 hrs, 8 mins
Most popular airlineKLM
Average flights per week143

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 RM2,122. 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 8 minutes is the average flight time from London to Seattle / Tacoma International.
KLM, Delta and Virgin Atlantic fly direct from London to Seattle / Tacoma International.
As of March 2025, there are 143 flights per week flying from London to Seattle / Tacoma International.
The cheapest month to fly from London to Seattle / Tacoma International is usually March 2025.
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 Tuesday, 22 April 2025.
Yes – the average flight time is 10 hours and 8 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.

Flying from London to Seattle-Tacoma International Airport (SEA): what you need to know

  • Take your pick of a number of airports when organising your flight from London to Seattle-Tacoma International Airport (SEA). Check out your options for flying out of London Heathrow Airport (LHR), London Gatwick Airport (LGW) or Stansted Airport (STN). London Luton Airport (LTN) and London City Airport (LCY) also service London.

  • The average time for a direct flight from London to Seattle-Tacoma International Airport is 10 hours 3 minutes.

  • Seattle is 7 hours behind London. Seattle-Tacoma International Airport is located in Seattle, which operates on the UTC-7 timezone.

  • London Heathrow Airport (LHR) to Seattle-Tacoma International Airport (SEA) is the most popular route. There are 38 direct departures a week to pick from. If you prefer starting your day later, hop on the last flight with Delta at 16:50. Go for the first LHR to SEA departure with British Airways at 09:25 if you want to get going earlier.

  • Your flight from London to SEA won't wait if you're late, so be at the airport on time. Arrive up to one hour in advance for domestic flights and two hours ahead for international travel.

  • During popular months such as July, it's a good idea to get to the airport earlier than usual. Plan to arrive two hours before domestic departures and four hours ahead of international flights when you travel during high season in general.

Airports in London

London Heathrow Airport (LHR)

  • Take the express route from London Heathrow Airport (LHR). Nonstop flights from London to Seattle-Tacoma International Airport (SEA) operate from here.

  • At LHR, there's a variety of carriers that operate direct flights from London to Seattle-Tacoma International Airport, including:

  • A stopover is the ideal opportunity to take a travel break — and perhaps even tour another city. When searching for flights from London to SEA leaving from London Heathrow Airport (LHR), uncheck the 'Direct flights only' box to see where you can visit along the way. Here are some options to consider:

    • Keflavik International Airport (KEF)

    • Vancouver International Airport (YVR)

    • Charles de Gaulle Airport (CDG)

  • The distance from central London to LHR is approximately 31 kilometres. Check out Google Maps for the quickest route, whether you're driving or taking public transport.

  • Want a relaxed start to your trip? Stay near London Heathrow Airport. Whether you're taking an early flight from London to Seattle-Tacoma International Airport or just don't want to be rushed, these hotels are ideal:

London Gatwick Airport (LGW)

  • London Gatwick Airport (LGW) has direct flights from London to Seattle-Tacoma International Airport (SEA).

  • When departing from LGW, you can pick from a variety of airlines that operate direct flights from London to SEA. Reach cruising altitude with one of these carriers:

  • Visit family or friends or just take a moment to recharge with a stopover. If you'd like to split up your flight from London to Seattle-Tacoma International Airport, here's where you can stop when heading out from London Gatwick Airport:

    • Vancouver International Airport (YVR)

    • Portland International Airport (PDX)

    • Keflavik International Airport (KEF)

  • With public transport, you can travel from central London to LGW in around 1 hour and 26 minutes. The terminal is roughly 80 kilometres away, and getting there by car takes approximately 1 hour and 19 minutes.

  • It's your holiday, so why not book an additional night away? Think about staying at one of these hotels near London Gatwick Airport the day before your flight from London to SEA:

About Seattle-Tacoma International Airport (SEA)

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

  • Seattle-Tacoma International Airport to the centre of Seattle takes around 18 minutes in a car. It's approximately 23 kilometres away. See what options are available, such as car rentals, cabs or ride-sharing services.

  • When travelling on public transport, expect a journey time of about 54 minutes.

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

  • Lock in a one-way ticket from London to Seattle-Tacoma International Airport from RM1,375 or travel return from just RM2,122. Fares listed are subject to change and may differ when you make your booking.

  • It's best to book 8 months before your departure date. Flight price data suggests you're more likely to score cheap tickets from London to SEA around that time.

  • The cheapest month for tickets from London to Seattle-Tacoma International Airport is May. Use the 'Whole month' tool to find the most affordable day to fly if you're flexible with your departure dates.

  • Log into your online account or use the app to create a Price Alert. We'll let you know straight away if there's a deal you can't miss. It's simple to do, and it'll save you from searching for cheap tickets from London to SEA every day.

  • Play around with the filters to find your ideal trip. To see the 'Cheapest,' 'Best' or 'Fastest' flights from London to Seattle-Tacoma International Airport, use the 'Sort by' function. You can also filter results by airline, arrival and departure times, and number of stops.

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

  • July is the most popular month for flights from London to Seattle-Tacoma International Airport. To steer clear of the crowds, head for Seattle in May when it's quieter.

  • Book your flight from London to SEA for August if you're eager to explore the city during its warmest month. Expect temperatures in Seattle to range from 12ºC to 28ºC.

  • If you'd rather travel in cooler conditions, look for a cheap flight from London to Seattle-Tacoma International Airport in February when temperatures average between -1ºC and 11ºC.

More about Seattle

Complete your Seattle trip with a car rental

  • After you've locked in your hotel and cheap flight from London to Seattle-Tacoma International Airport, next up is choosing one of our car rentals in Seattle. Explore the deals and easily compare your options on price, fuel policies, and more.

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