Cheap Flights from Seattle to London Heathrow

Compare Seattle to London Heathrow flight deals

Find the cheapest month or even day of the year to fly to London Heathrow

Book the best London Heathrow fare with no extra fees

Flight deals from Seattle to London Heathrow

Looking for a cheap last-minute deal or the best return flight from Seattle to London Heathrow? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Seattle to London Heathrow

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

Direct flights from Seattle to London Heathrow

Seattle to London Heathrow: Alternative routes

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

Seattle to London: Flight information

The things to know before you go.
Cheapest flight foundSAR 807
Cheapest month to flyDecember
Average flight time9 hrs, 28 mins
Most popular airlineAlaska Airlines
Average flights per week191

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

The best price we found for a return flight from Seattle to London Heathrow is SAR 2,033. 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.
9 hours and 28 minutes is the average flight time from Seattle to London Heathrow.
Alaska Airlines, Aer Lingus and Finnair fly direct from Seattle to London Heathrow.
As of October 2024, there are 191 flights per week flying from Seattle to London Heathrow.
The cheapest month to fly from Seattle to London Heathrow is usually October 2024.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle to London Heathrow Airport on Monday, 25 November 2024.
Yes – the average flight time is 9 hours and 28 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 London Heathrow 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 London is around 40 days in advance, so don’t leave your flight to the last minute.

How to find cheap flights to London Heathrow from Seattle

Looking for cheap tickets from Seattle to London Heathrow? Here are a few tips on how to secure the best flight price and make your journey as smooth as possible.

  • Simply hit 'search'. From British Airways to international carriers like Emirates, we compare all major airlines along with the most popular online travel agents to find the cheapest plane tickets from Seattle to London Heathrow. And with us there are no hidden fees - what you see is what you pay.
  • Compare flight deals to London Heathrow from Seattle from over 1,000 providers. Then choose the cheapest or fastest plane tickets.
  • Flex your dates to find the best Seattle-London Heathrow ticket prices. If you are flexible when it comes to your travel dates, use Skyscanner's 'Whole month' tool to find the cheapest month, and even day to fly to London Heathrow from Seattle.
  • Set up a Price Alert. You can easily track the fare of your cheap Seattle-London Heathrow flights by creating an alert. Whenever prices go down or up, you'll get an email or push notification to help make sure you get the best possible flight deal.
  • Fly without stops. Only interested in direct flights between Seattle and London Heathrow? Make sure to tick 'Direct flights only' when performing a search. If there are direct flights available on the route, these will appear in the results.
  • Find the cheapest Business class flights from Seattle and London Heathrow. We scour the internet for the best Business, Premium Economy and First Class flight fares to London Heathrow, too. Check the difference in price as you search – you might just chance upon a last-minute low fare. Note that not all cabin classes are available for every destination or airline.
  • Include nearby airports in your search. Widen your search for Seattle to London Heathrow flight deals by selecting the "add nearby airports" option. This will allow you to see flight prices for all the nearest airports at your departure point and your destination and could help you save next time you travel.
  • Combine your flight to London Heathrow from Seattle with hotels and car hire

    Once you've secured your cheap flight ticket from Seattle to London Heathrow, discover the best prices and exclusive rates for hotels in London Heathrow or nearby. You can also compare hundreds of car hire companies in one go so that you get the best car hire price for your trip.


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