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Cheap Flights from London to Seattle

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Compare London Heathrow to Seattle / Tacoma International flight deals

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

Book the best Seattle / Tacoma International fare with no extra fees

Flight deals from London Heathrow to Seattle / Tacoma International

Looking for a cheap last-minute deal or the best return flight from London Heathrow to Seattle / Tacoma International? Find the lowest prices on one-way and return tickets right here.
Seattle.$755 per passenger.Departing Thu, 24 Apr, returning Mon, 28 Apr.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Thu, 24 Apr, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Mon, 28 Apr, arriving in London Heathrow.Price includes taxes and charges.From $755, select.
Seattle.$778 per passenger.Departing Mon, 5 May, returning Mon, 12 May.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Mon, 5 May, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Mon, 12 May, arriving in London Heathrow.Price includes taxes and charges.From $778, select.
Seattle.$797 per passenger.Departing Wed, 11 Jun, returning Sat, 12 Jul.Return flight with Austrian Airlines.Outbound indirect flight with Austrian Airlines, departs from London Heathrow on Wed, 11 Jun, arriving in Seattle / Tacoma International.Inbound indirect flight with Austrian Airlines, departs from Seattle / Tacoma International on Sat, 12 Jul, arriving in London Heathrow.Price includes taxes and charges.From $797, select.
Seattle.$860 per passenger.Departing Tue, 29 Apr, returning Tue, 6 May.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 29 Apr, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Tue, 6 May, arriving in London Heathrow.Price includes taxes and charges.From $860, select.
Seattle.$877 per passenger.Departing Sat, 11 Oct, returning Sun, 12 Oct.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Sat, 11 Oct, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Sun, 12 Oct, arriving in London Heathrow.Price includes taxes and charges.From $877, select.
Seattle.$877 per passenger.Departing Sat, 1 Nov, returning Fri, 7 Nov.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Sat, 1 Nov, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Fri, 7 Nov, arriving in London Heathrow.Price includes taxes and charges.From $877, select.
Seattle.$877 per passenger.Departing Thu, 27 Nov, returning Tue, 2 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Thu, 27 Nov, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Tue, 2 Dec, arriving in London Heathrow.Price includes taxes and charges.From $877, select.
Seattle.$878 per passenger.Departing Mon, 1 Dec, returning Fri, 5 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Mon, 1 Dec, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Fri, 5 Dec, arriving in London Heathrow.Price includes taxes and charges.From $878, select.

Find the cheapest month to fly from London Heathrow 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 Heathrow to Seattle / Tacoma International flights are currently cheapest in April.
Mar
from $1,014
Apr
from $755
May
from $778
Jun
from $1,001
Jul
from $1,001
Aug
from $1,298
Sep
from $949
Oct
from $877
Nov
from $877
Dec
from $878
Jan
from $982
Feb
from $984

Direct flights from London Heathrow to Seattle / Tacoma International

London Heathrow to Seattle / Tacoma International: Alternative routes

Compare routes from London Heathrow 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$755
Cheapest month to flyApril
Average flight time10 hrs, 7 mins
Most popular airlineKLM
Average flights per week137

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

The best price we found for a return flight from London Heathrow to Seattle / Tacoma International is $755. 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 7 minutes is the average flight time from London Heathrow to Seattle / Tacoma International.
KLM, Delta and Virgin Atlantic fly direct from London Heathrow to Seattle / Tacoma International.
As of March 2025, there are 137 flights per week flying from London Heathrow to Seattle / Tacoma International.
The cheapest month to fly from London Heathrow to Seattle / Tacoma International is usually March 2025.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from London Heathrow Airport to Seattle / Tacoma International Airport on Thursday, 24 April 2025.
Yes – the average flight time is 10 hours and 7 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.
Currently, Icelandair and British Airways offer the cheapest flight tickets to Seattle / Tacoma International.

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

  • A direct flight from London Heathrow Airport to Seattle-Tacoma International Airport takes on average 10 hours 3 minutes. The timezone in Seattle is UTC-7, so it's 7 hours behind London.

  • Each week, there are 38 flights from London Heathrow Airport to Seattle-Tacoma International Airport. If you'd like to jet off as soon as possible, select the 09:25 British Airways flight. If you'd rather make the most of your day before you fly, the last departure from LHR to SEA is 21:20 with Delta Air Lines.

  • Longer lines at check-in and security are more likely if you're travelling during high season, so allow some extra breathing room. A good rule of thumb for peak times? Get there up to four hours early for international flights and at least two hours for domestic departures.

  • If you want to break up your flight from London Heathrow Airport to Seattle-Tacoma International Airport, think about adding a stopover. Just uncheck 'Direct flights only' and find a city that appeals to you. The most popular stopovers on the LHR - SEA route are:

    • Keflavik International Airport

    • Vancouver International Airport

    • Charles de Gaulle Airport

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

  • The best price we've found for a one-way ticket from London Heathrow Airport to Seattle-Tacoma International Airport is $558. The cheapest price for a return flight is $755. Remember that fares can change due to demand at the time of booking.

  • Book 9 months before you want to travel. After crunching the numbers on our calendar, this is how far you should book ahead to secure cheap flight tickets from LHR to SEA.

  • Organise your trip for May. That's the cheapest month for tickets from London Heathrow Airport to Seattle-Tacoma International Airport. If you're flexible with your dates, try out the 'Whole month' tool to find the cheapest airfare across every month.

  • Create a Price Alert for cheap flight tickets from LHR to SEA. There's no need to search every day to find out if fares have fallen. We'll tell you when there's a change in price.

  • Tailor your trip using filters. Select your ideal arrival and departure times, airlines and total journey duration. You can also sort your results by 'Best,' 'Cheapest' or 'Fastest' flights from London Heathrow Airport to Seattle-Tacoma International Airport.

Handy information about London Heathrow Airport (LHR)

  • The journey from central London to London Heathrow Airport takes approximately 1 hour and 1 minute by public transport. If you ride-share, drive or get a cab, you'll cover the 31 kilometres in 57 minutes or so, depending on traffic.

  • Looking for a handy hotel close to LHR? If you're on an early flight from London Heathrow Airport to Seattle-Tacoma International Airport, these accommodation options will have you moments from your departure gate:

Arriving at Seattle-Tacoma International Airport (SEA)

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

  • Seattle-Tacoma International Airport to central Seattle is around 18 minutes by car. It's approximately 23 kilometres away. Find out what options are available, such as car rentals, cabs or ride-sharing.

  • Travelling on public transport will take you around 54 minutes.

When to fly to Seattle-Tacoma International Airport (SEA)

  • The quietest month for a flight from London Heathrow Airport to Seattle-Tacoma International Airport is May, while July is the busiest. Pick the best time to go to Seattle based on whether you prefer a bustling atmosphere or a more laid-back vibe.

  • Before locking in your flight from London Heathrow Airport to Seattle-Tacoma International Airport, think about the kind of weather you enjoy. August is the warmest month in Seattle, with the temperature ranging from 12ºC to 28ºC.

  • If you want to travel in cooler conditions, search for a cheap ticket from LHR to SEA in February. Average temperatures are between -1ºC and 11ºC then.

More about Seattle

Complete your Seattle trip with hotels and a car rental

  • Once you've secured your cheap ticket to Seattle-Tacoma International Airport, discover the lowest prices and exclusive offers on hotels. You can also compare hundreds of car rental companies in one place to get the best car rental price for your Seattle holiday.

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Plan the rest of your trip from London to Seattle

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