Cheap Flights 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

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Flight deals from London Heathrow Airport to Seattle

Looking for a cheap last-minute deal or the best return flight from London Heathrow Airport to Seattle? If you want to travel next month, return fares start from $1,190. Find the lowest prices on one-way and return tickets right here.

Seattle.$1,166 per passenger.Departing Thu, 18 Feb, returning Sun, 28 Feb.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Thu, 18 Feb, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Sun, 28 Feb, arriving in London Heathrow.Price includes taxes and charges.From $1,166, select.

Seattle.$1,166 per passenger.Departing Tue, 23 Feb, returning Sat, 6 Mar.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 23 Feb, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Sat, 6 Mar, arriving in London Heathrow.Price includes taxes and charges.From $1,166, select.

Seattle.$1,171 per passenger.Departing Thu, 4 Mar, returning Sat, 13 Mar.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Thu, 4 Mar, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Sat, 13 Mar, arriving in London Heathrow.Price includes taxes and charges.From $1,171, select.

Seattle.$1,189 per passenger.Departing Tue, 14 Apr, returning Tue, 28 Apr.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 14 Apr, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Tue, 28 Apr, arriving in London Heathrow.Price includes taxes and charges.From $1,189, select.

Seattle.$1,190 per passenger.Departing Thu, 7 May, returning Wed, 20 May.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Thu, 7 May, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Wed, 20 May, arriving in London Heathrow.Price includes taxes and charges.From $1,190, select.

Seattle.$1,195 per passenger.Departing Thu, 16 Apr, returning Tue, 15 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Thu, 16 Apr, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Tue, 15 Dec, arriving in London Heathrow.Price includes taxes and charges.From $1,195, select.

Seattle.$1,203 per passenger.Departing Thu, 8 Oct, returning Thu, 15 Oct.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Thu, 8 Oct, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Thu, 15 Oct, arriving in London Heathrow.Price includes taxes and charges.From $1,203, select.

Seattle.$1,203 per passenger.Departing Thu, 12 Nov, returning Tue, 17 Nov.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Thu, 12 Nov, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Tue, 17 Nov, arriving in London Heathrow.Price includes taxes and charges.From $1,203, select.

Seattle.$1,204 per passenger.Departing Tue, 8 Dec, returning Fri, 11 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 8 Dec, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Fri, 11 Dec, arriving in London Heathrow.Price includes taxes and charges.From $1,204, select.

Seattle.$1,205 per passenger.Departing Mon, 30 Nov, returning Sun, 6 Dec.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Mon, 30 Nov, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Sun, 6 Dec, arriving in London Heathrow.Price includes taxes and charges.From $1,205, select.

Seattle.$1,205 per passenger.Departing Tue, 19 Jan, returning Thu, 28 Jan.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 19 Jan, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Thu, 28 Jan, arriving in London Heathrow.Price includes taxes and charges.From $1,205, select.

Seattle.$1,207 per passenger.Departing Wed, 30 Sep, returning Wed, 7 Oct.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Wed, 30 Sep, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Wed, 7 Oct, arriving in London Heathrow.Price includes taxes and charges.From $1,207, select.

Seattle.$1,208 per passenger.Departing Wed, 15 Apr, returning Sun, 29 Nov.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Wed, 15 Apr, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Sun, 29 Nov, arriving in London Heathrow.Price includes taxes and charges.From $1,208, select.

Seattle.$1,215 per passenger.Departing Thu, 30 Apr, returning Thu, 7 May.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Thu, 30 Apr, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Thu, 7 May, arriving in London Heathrow.Price includes taxes and charges.From $1,215, select.

Seattle.$1,216 per passenger.Departing Tue, 28 Apr, returning Fri, 25 Sep.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Tue, 28 Apr, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Fri, 25 Sep, arriving in London Heathrow.Price includes taxes and charges.From $1,216, select.

Seattle.$1,217 per passenger.Departing Wed, 23 Sep, returning Wed, 30 Sep.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Wed, 23 Sep, arriving in Seattle / Tacoma International.Inbound indirect flight with Icelandair, departs from Seattle / Tacoma International on Wed, 30 Sep, arriving in London Heathrow.Price includes taxes and charges.From $1,217, select.

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 February.

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Direct flights from London Heathrow to Seattle

Alternative London Heathrow to Seattle routes

Looking for the cheapest, fastest or easiest route from London Heathrow to Seattle? You could fly into the following airports instead.

London to Seattle: Flight information

The things to know before you go.

Cheapest flight found	$814
Cheapest month to fly	April
Average flight time	10 hrs, 13 mins
Most popular airline	KLM
Average flights per week	155

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

How many airports are there in Seattle?

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.

How much are return flights from London Heathrow to Seattle?

The best price we found for a return flight from London Heathrow to Seattle is $1,166. 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.

How long does it take to fly from London Heathrow to Seattle?

10 hours and 13 minutes is the average flight time from London Heathrow to Seattle.

Which airlines fly direct from London Heathrow to Seattle?

KLM, Alaska Airlines and Virgin Atlantic fly direct from London Heathrow to Seattle.

How many flights are there a week from London Heathrow to Seattle?

As of April 2026, there are 310 flights per week flying from London Heathrow to Seattle.

When is the cheapest time to fly from London Heathrow to Seattle?

The cheapest month to fly from London Heathrow to Seattle is usually February.

Which is the cheapest airport to fly into in Seattle?

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 $1,166.

Which upcoming date is cheapest to fly from London Heathrow Airport to Seattle on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from London Heathrow Airport to Seattle on Thursday, 18 February 2027.

Can I get a direct flight from London Heathrow Airport to Seattle?

Yes – the average flight time is 10 hours and 13 minutes.

How can I get the best flight deal from London Heathrow Airport to Seattle?

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.

When is the best time to book flights to Seattle?

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.

What’s the weather like in Seattle?

In April, the average temperature is usually around 8°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.

Which is the cheapest airline to fly from London Heathrow Airport to Seattle with?

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

Jump on a direct flight from London Heathrow Airport to Seattle and you'll be travelling for an average of 9 hours 30 minutes.
London Heathrow Airport is located in London. Following the UTC-8 timezone, Seattle is eight hours behind London.
The busiest route is from London Heathrow Airport (LHR) to Seattle-Tacoma International Airport (SEA). Take your pick of 25 services every week between these two airports. If you'd like to take off as soon as possible, the earliest flight from LHR to SEA is the 09:25 British Airways option. If you'd rather fly out later on, the last departure is at 18:30 with Delta Air Lines.
Give yourself enough time to get on your LHR to Seattle flight. As a rule of thumb, arrive two hours before international departures and an hour ahead for domestic flights.
Travelling over a peak time like July? School holidays and other high seasons can mean longer lines and delays at security. Play things extra safe and arrive up to four hours before an international flight and two hours before a domestic departure.
You can book a direct London Heathrow Airport to Seattle ticket. Begin your trip at LHR and end it at Seattle-Tacoma International Airport (SEA).
You'll have your choice of airlines that offer direct flights from London Heathrow Airport to Seattle. Get up and away with one of these:
A stopover is the ideal opportunity to break up your journey and maybe even tick off a new city. When searching for plane tickets from LHR to Seattle, deselect the 'Direct flights only' box to see where you can stop along the way. Here are some options to consider:
- Paris Charles de Gaulle Airport (CDG)
- Vancouver International Airport (YVR)
- Keflavik Airport (KEF)
The journey from central London to LHR takes about 25 minutes on public transport. If you drive, ride-share or get a taxi, you'll cover the 26 kilometres in 45 minutes or so, depending on traffic.
In search of a hotel near LHR? If you're catching an early flight from London Heathrow Airport to Seattle, these accommodation options put the terminal practically at your doorstep:
Of all flights departing from London Heathrow Airport, 78% arrive as scheduled at their destination.

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

$814 is currently the best price for a one-way London Heathrow Airport to Seattle flight. A return plane ticket starts at $1,166. These fares can change based on demand.
Booking ahead of time is often the key to finding a cheap flight from LHR to Seattle. Airlines adjust prices based on demand, so the closer you get to departure, the more it could cost you.
Finding cheap tickets from London Heathrow Airport to Seattle is easier if you're flexible with your travel dates. Use the 'Whole month' tool to get the best prices across the month and score a sweet deal.
You don't need to check back in every day to find out if fares have dropped when you create a Price Alert. We'll update you when there's an extra saving on cheap flights from LHR to Seattle.
Pick your preferred arrival and departure times, airlines and number of stops with our filters. Then, sort the results for your flight from London Heathrow Airport to Seattle by 'Fastest,' 'Cheapest' or 'Best.'

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

Seattle-Tacoma International Airport (SEA) to central Seattle takes around 25 minutes to reach by car. The centre is roughly 23 kilometres away.
If you're travelling on public transport, expect a journey time of around 35 minutes.
Think about booking a hotel near SEA if you're coming in on a late flight from London Heathrow Airport to Seattle. Choose one of these accommodation options and make your first night all about catching up on rest:
To lock in the lowest price, book your ride from Seattle-Tacoma International Airport around one week in advance of your flight from LHR to Seattle.

Seattle Paine Field International Airport (PAE)

Seattle Paine Field International Airport (PAE) is about 40 kilometres from central Seattle. After your flight from London Heathrow Airport to Seattle, it'll take you around 40 minutes to reach the heart of the city in a taxi or ride-share.
You can expect the trip to take about 1 hour 30 minutes on public transport.
Hang the 'Do not disturb' sign on your door and unwind at a hotel near PAE. Here are a few options where you can take a load off after your LHR to Seattle flight:
Get your ideal vehicle, not just whatever's left, by securing your ride from PAE ahead of time. You can also avoid paying more than you need to, especially during peak travel times.

King County International Airport (BFI)

King County International Airport (BFI) is around 11 kilometres from central Seattle. It takes about 20 minutes to get to the city centre by ride-share or taxi once you've stepped off your flight from London Heathrow Airport to Seattle.
If you go by public transport, the journey takes about 35 minutes.
Find a hotel close to BFI and go from landing to lounging in your room in a flash. Whether you have a late LHR to Seattle flight or just want to keep your travel plans simple, these stays offer a quick route to a good night's sleep:
Booking a couple of weeks in advance of your flight from London Heathrow Airport to Seattle is always a good idea. Along with more affordable prices, you'll likely have a better variety of makes and models to choose from at BFI.

Best time to go to Seattle

It's time to plan your dates for your flight from London Heathrow Airport to Seattle. July is the most popular month to visit Seattle. If you like a more relaxed vibe, go in December.
Book a London Heathrow Airport to Seattle plane ticket with a departure in August if you're eager to experience the city during its warmest month. Expect temperatures to range from 12ºC to 28ºC.
February has average temperatures of between -1ºC and 11ºC. Search for a cheap ticket from LHR to Seattle around that time if you like cooler conditions.

More about Seattle

After booking your flight from London Heathrow Airport to Seattle, choose a hotel that combines comfort with a great location. Make one of these options your base for exploring Seattle:
Pike Place Market and Space Needle are just two of the top-rated attractions to add to your Seattle to-do list. Continue your sightseeing adventures at Seattle Skyline.

Explore more of the United States

You've done Seattle, now it's time to explore more of the United States. Journey about 241 kilometres south to Portland to tick off its must-visit sights. From Portland Japanese Garden to Peninsula Park Rose Garden and Beyond Van Gogh Portland, you'll have a full itinerary ahead.
If you're ready to explore another great destination in the United States, head for Spokane, roughly 370 kilometres east of Seattle. Riverside State Park, Spokane Falls (Upper Falls) and Cathedral of Our Lady of Lourdes are key highlights.