Flight tickets from London Heathrow to Seattle

Compare London Heathrow to Seattle flight deals

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

Book the best Seattle fare with no extra fees

Flight deals from London Heathrow to Seattle

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

Find the cheapest month to fly from London Heathrow to Seattle

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

Direct flights from London Heathrow to Seattle

London to Seattle: Flight information

The things to know before you go.
Cheapest flight found₹ 31,870
Cheapest month to flyApril
Average flight time10 hrs, 12 mins
Most popular airlineKLM
Average flights per week166

Finding cheap flights from London Heathrow 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 Heathrow to Seattle is ₹ 53,511. 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 12 minutes is the average flight time from London Heathrow to Seattle.
KLM, Air France and Virgin Atlantic fly direct from London Heathrow to Seattle.
As of February 2026, there are 166 flights per week flying from London Heathrow to Seattle.
The cheapest month to fly from London Heathrow to Seattle is usually March.
If you're flying from London Heathrow 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 ₹ 53,511.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from London Heathrow Airport to Seattle on Wednesday, 11 March 2026.
Yes – the average flight time is 10 hours and 12 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 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 February, the average temperature is usually around 4°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, Icelandair and British Airways offer the cheapest flight tickets to Seattle.

Travelling from London Heathrow Airport (LHR) to Seattle: what you need to know

  • The average duration of a direct flight from London Heathrow Airport to Seattle is 9 hours 35 minutes.

  • Seattle is seven hours behind London, where London Heathrow Airport is located. Seattle follows the UTC-7 timezone.

  • The busiest route is from London Heathrow Airport (LHR) to Seattle-Tacoma International Airport (SEA). Take your pick of 26 services every week between these two airports. If you'd like to head off as soon as possible, the earliest flight from LHR to SEA is the 09:25 British Airways service. If you'd rather fly out later on, the final departure is at 18:30 with Delta Air Lines.

  • To avoid missing your LHR to Seattle flight, allow plenty of time for things like check-in and baggage drop. Arriving two hours ahead of international departures and an hour before domestic flights is the standard rule.

  • Longer lines at check-in and security are likely if you're heading away during high season, so give yourself a little extra breathing room. A good rule for peak times? Get there up to four hours early for international flights and two hours for domestic departures.

  • Direct London Heathrow Airport to Seattle tickets are available for booking. Seattle-Tacoma International Airport (SEA) is where you'll complete your journey.

  • Choose from a variety of airlines that operate direct flights from London Heathrow Airport to Seattle. Book your journey with one of these:

  • Consider adding a stopover to potentially find a cheaper flight ticket from LHR to Seattle. Simply uncheck 'Direct flights only' during your search. Take a detour (and maybe pocket some savings) by stopping at one of these popular options:

    • Charles de Gaulle Airport (CDG)

    • Vancouver International Airport (YVR)

    • Keflavik International Airport (KEF)

  • LHR is about 26 kilometres from central London. If you're catching a cab, ride-sharing or driving from the centre, it'll take 55 minutes or so to get there, depending on traffic. If you're planning to take public transport, expect the travel time to be around 1 hour.

  • Catching an early flight from London Heathrow Airport to Seattle? Avoid the stress of rushing to the airport (and enjoy a little extra shut-eye) by choosing one of these hotels close to LHR:

  • 68.18% of flights taking off from London Heathrow Airport touch down at their destination on time.

How to find the cheapest flights from London Heathrow Airport (LHR) to Seattle

  • The lowest price we've found for a one-way London Heathrow Airport to Seattle flight is ₹ 31,870. The cheapest price for a return flight is ₹ 53,511. Bear in mind fares can change due to demand at the time of booking.

  • Lock in cheap flights from LHR to Seattle by booking one month ahead. Based on our research, that's the sweet spot for bagging a bargain.

  • May is the best month for picking up an amazing deal on London Heathrow Airport to Seattle tickets. If you need to travel during a different time of year, the 'Whole month' tool will give you the lowest prices for every month.

  • Locking in a cheap flight from LHR to Seattle couldn't be easier with Price Alerts. Simply set up one of these automatic notifications and we'll notify you when a deal gets even better.

  • Select your preferred departure and arrival times, number of stops and airlines with our filters. Then, sort the results for your flight from London Heathrow Airport to Seattle by 'Cheapest,' 'Fastest' or 'Best.'

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • Seattle-Tacoma International Airport (SEA) is around 23 kilometres from central Seattle. If you're catching a cab or a ride-share, the drive will take roughly 20 minutes.

  • If you're travelling by public transport, expect a journey time of about 55 minutes.

  • If you have a late flight from London Heathrow Airport to Seattle, few things beat the convenience of staying close to the terminal. Grab your luggage from the carousel and then be showered and resting not long after at one of these accommodation options near SEA:

  • Hit the road running by picking up a Seattle-Tacoma International Airport rental car. Grab your wheels from Thrifty, Europcar or Budget and experience the lesser-explored corners of Seattle and beyond.

  • Reserving your ride from Seattle-Tacoma International Airport around one week before your flight from LHR to Seattle can help you lock in the best possible rate.

Lake Union Sea Plane Base Airport (LKE)

  • Central Seattle is around 3 kilometres from Lake Union Sea Plane Base Airport (LKE). Once your flight from London Heathrow Airport to Seattle has hit the runway and you've made your way out of the airport, the drive should take about 10 minutes.

  • Public transport will get you there in around 25 minutes.

  • You'll find some great places to rest your head close to LKE. Tuck yourself in and get cosy after your LHR to Seattle flight at any of these perfectly located options:

Best time to go to Seattle

  • Plan your trip to Seattle in high season if you prefer a lively atmosphere, but remember that prices tend to be higher. Alternatively, book flights from London Heathrow Airport to Seattle during low season when prices are cheaper and it's less crowded.

  • The warmest month in Seattle is August, with temperatures ranging between 12ºC and 28ºC. Lock in your London Heathrow Airport to Seattle flight ticket then if you enjoy this type of weather.

  • Look for cheap tickets from LHR to Seattle in February if you'd rather travel when it's cooler. Temperatures are at their lowest then, ranging between -1ºC and 11ºC on average.

More about Seattle

  • Start your Seattle trip right by choosing the perfect place to stay. After booking your flight from London Heathrow Airport to Seattle, check out our selection of hotels including:

  • All great holidays should include some sightseeing. LMN Architects, Greyhound: Bus Station and Boeing Radiation Effects Lab are must-do's during your Seattle adventure.

Explore more of United States

  • Portland is just one of the many cities in United States waiting to be discovered after you've seen Seattle. Around 241 kilometres away to the south, top sights here include Pioneer Courthouse Square, Portland Japanese Garden and Pittock Mansion.

  • Around 370 kilometres east of Seattle, Spokane is another essential stop in United States. Experience this destination's highlights firsthand 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.