How often are flights from London to Seattle delayed?

About 12% of weekly flights between London and Seattle have experienced delays in the past year, with the average delay time being 134 minutes.

Which airline has the best punctuality record on London to Seattle flights?

Over the past year, Delta have had the lowest number of delays on this route, with just 5% of flights being delayed.

Which airport typically offers the quickest stopover for flights from London Heathrow Airport to Seattle?

Flights via Dallas (DFW) offer the fastest connection on this route, with an average stopover time of 1h 49m.

What is the most punctual flight time for London to Seattle flights?

Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.

What’s the cheapest stopover airport for flights from London Heathrow Airport to Seattle?

Dallas (DFW) is the most affordable one-stop option, with an average return flight price of £501.

What day of the week experiences the fewest flight delays on this route?

Sunday tends to have the lowest number of delays on this route, whereas Friday has historically faced a higher average of delays compared to other days of the week.

What’s the fastest stopover option from London Heathrow Airport to Seattle?

Flights via Vancouver (YVR) have the shortest average one-way travel time for one-stop routes: 12h 46m.

What’s the top stopover airport for flights from London Heathrow Airport to Seattle?

Reykjavik (KEF) – chosen by Cheapflights users on 75% of one-stop itineraries from London Heathrow Airport to Seattle on Cheapflights.

How long is the flight from London Heathrow Airport to Seattle?

Departing from London Heathrow Airport to Seattle will take you 10h 15m. The distance from London Heathrow Airport to Seattle is about 4783 mi. All flights are typically direct.

What are the cheapest airlines flying from London Heathrow Airport to Seattle round-trip?

According to our current data, Icelandair (£333), Lufthansa (£339), and United Airlines (£375) offers the cheapest pricing from London Heathrow Airport to Seattle. Icelandair is priced at 44% lower than the current average price of a flight leaving 3 months from now.

What are the cheapest airlines to fly from London Heathrow Airport to Seattle one-way?

The cheapest airline one-way is British Airways, with whom users have recently found tickets for as low as £340. However, be on the lookout for offers from Icelandair and Alaska Airlines, as they are both options that can get you from London Heathrow Airport to Seattle for a low price.

Weekly flight availability from London Heathrow Airport to Seattle

The most flights from LHR to SEA are scheduled on a Monday (24 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (24 on average).

In terms of precipitation, rainfall in Seattle ranges from 18.0 - 168.0 inches per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit Seattle when rainfall is around 18.0 mm.

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

What are the cheapest flights from London Heathrow Airport to Seattle?

The cheapest flight price from London Heathrow Airport to Seattle is £350. On average you can expect to pay £1,757. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for £348.

What are the most reliable airlines from London Heathrow Airport to Seattle?

Consider Scandinavian Airlines (83%), KLM (83%) or SAUDIA (83%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Seattle.

What are the most popular airlines that fly from London Heathrow Airport to Seattle?

When booking a flight from London Heathrow Airport to Seattle, you may want to consider flying on Virgin Atlantic, British Airways or Alaska Airlines as they are the most popular for this route.

What airport do you fly into for flights to Seattle from London Heathrow?

If you book a flight to Seattle from London Heathrow, you will be flying to Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 24 flights from London Heathrow to Seattle/Tacoma Intl per day from 12 different airlines.

Can I find deals for flights from Heathrow to Seattle that include hotel bookings?

Yes. In addition to deals on Heathrow to Seattle flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Heathrow to Seattle?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Seattle.

Can I find deals for business class flights from Heathrow to Seattle?

Yes. Cheapflights offers flight deals from Heathrow to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£391+ Cheap Flights from London Heathrow Airport to Seattle

Cheapflights Tip: The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in January or February, booked 57 days in advance, depart on a Thursday or Friday and return on a Wednesday

Cheap flight deals from Heathrow to Seattle

Enter your travel dates to find the best prices.

Cheapest

Best

Direct

Last-minute

One-way

Cheapest flights from Heathrow to Seattle
Explore the most affordable flight options available from Heathrow to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 October 2026.

Tue 15/1212:15 -

1 stop12h 45m

Fri 25/1214:35 -

1 stop12h 15m

Deal found 9/10£413

Mon 23/1120:35 -

1 stop28h 25m

Mon 30/1114:35 -

1 stop12h 15m

Deal found 9/10£416

Fri 20/1112:15 -

1 stop12h 45m

Mon 30/1114:35 -

1 stop20h 55m

Deal found 9/10£417

Tue 15/1212:15 -

1 stop12h 45m

Mon 28/1214:35 -

1 stop12h 15m

Deal found 8/10£419

Mon 9/1120:35 -

1 stop28h 25m

Mon 23/1114:35 -

1 stop12h 15m

Deal found 9/10£420

Thu 19/1120:35 -

1 stop28h 25m

Wed 2/1214:35 -

1 stop20h 55m

Deal found 8/10£421

Sun 8/1114:45 -

Nonstop10h 15m

Sun 15/1118:45 -

Nonstop9h 35m

Deal found 11/10£422

Tue 24/1114:45 -

Nonstop10h 15m

Tue 1/1218:45 -

Nonstop9h 35m

Deal found 10/10£423

Fri 13/1114:45 -

Nonstop10h 15m

Thu 26/1118:45 -

Nonstop9h 35m

Deal found 8/10£423

Wed 25/1114:45 -

Nonstop10h 15m

Tue 1/1218:45 -

Nonstop9h 35m

Deal found 10/10£424

Sat 7/1114:45 -

Nonstop10h 15m

Sat 14/1118:45 -

Nonstop9h 35m

Deal found 10/10£425

Find flight deals from Heathrow to Seattle

Round-trip from	£413
One-way from	£391
Popular in	July
Cheapest in	January
Average price	£543
Good round-trip deal	£430 or less
Good one-way deal	£400 or less

Icelandair
15/12-25/12
2 total stops
25h 00m total
London to Seattle

Search Deals

19/11-31/12
3 total stops
52h 10m total
London to Seattle

Search Deals

Highest demand for flights based on searches. 7% potential increase in price (£38 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (£7 potential savings vs. average return price).

Search Deals

Average for round-trip flights in October 2026

Search Deals

Price to beat on a round-trip flight from London Heathrow to Seattle/Tacoma Intl.

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Price to beat on a one-way flight from London Heathrow to Seattle/Tacoma Intl.

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from London Heathrow Airport to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 16/3

14:45-17:50

Nonstop10h 05m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£393

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 6/4

17:00-19:10

Nonstop10h 10m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£396

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Wed 9/12

07:40-23:44

3 stops24h 04m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£412

Fastest return journey

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sun 6/12

14:55-16:50

Nonstop9h 55m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£421

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Fri 11/12

07:30-21:01

2 stops21h 31m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£423

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sat 13/3

08:40-17:27

2 stops16h 47m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£431

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 9/11

14:45-17:00

Nonstop10h 15m

Seattle/Tacoma Intl

Mon 23/11

18:45-12:20

Nonstop9h 35m

£431

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sat 12/12

14:45-17:00

Nonstop10h 15m

Seattle/Tacoma Intl

Tue 19/1

18:40-12:20

Nonstop9h 40m

£431

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Wed 28/10

14:45-18:05

Nonstop10h 20m

Seattle/Tacoma Intl

Mon 1/2

18:40-12:20

Nonstop9h 40m

£431

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Wed 4/11

14:45-17:00

Nonstop10h 15m

Seattle/Tacoma Intl

Sun 15/11

18:45-12:20

Nonstop9h 35m

£431

Flights are sorted by cheapest return flights first.

Deals found on 12/10

Showing 1-10 of 24 resultsSorted by cheapest first

Best time to book a flight from Heathrow to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Heathrow with our price prediction graph.

LHR-SEA

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to Seattle

Prices

Airlines

Delays

The best time to book flights from London Heathrow Airport to Seattle is 56 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from London Heathrow Airport to Seattle?

Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of £489). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £676). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from LHR to SEA?

When flying from London Heathrow Airport to Seattle, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost for a return flight from London Heathrow Airport to Seattle?

Airfare is below average for this route at the moment.

London Heathrow Airport to Seattle flights typically cost between £438 and £596 in December.
The cheapest return price found within the last 5 days was £413 on Icelandair (15 Dec–25 Dec).

Reviews of airlines servicing Seattle

See what other customers who have flown with Alaska Airlines,KLM, andVirgin Atlantic from London Heathrow Airport to Seattle have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

7.9

Good

13,060 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.

Alaska Airlines

7.9

Good

13,060 reviews

Alaska Airlines

7.9

Good

13,060 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jun 2026

LHR - SEA

KLM

7.8

Good

1,586 reviews

Alaska Airlines

7.9

Good

13,060 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jun 2026

LHR - SEA

Virgin Atlantic

7.5

Good

694 reviews

Alaska Airlines

7.9

Good

13,060 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jun 2026

LHR - SEA

Icelandair

6.9

Okay

758 reviews

Alaska Airlines

7.9

Good

13,060 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jun 2026

LHR - SEA

British Airways

6.7

Okay

8,262 reviews

Alaska Airlines

7.9

Good

13,060 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jun 2026

LHR - SEA

Related info for your journey

What airport do you fly into for flights to Seattle from London Heathrow?
If you book a flight to Seattle from London Heathrow, you will be flying to Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 24 flights from London Heathrow to Seattle/Tacoma Intl per day from 12 different airlines.
How long is the flight from London Heathrow Airport to Seattle?
Departing from London Heathrow Airport to Seattle will take you 10h 15m. The distance from London Heathrow Airport to Seattle is about 4783 mi. All flights are typically direct.
What are the cheapest airlines flying from London Heathrow Airport to Seattle round-trip?
According to our current data, Icelandair (£333), Lufthansa (£339), and United Airlines (£375) offers the cheapest pricing from London Heathrow Airport to Seattle. Icelandair is priced at 44% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from London Heathrow Airport to Seattle one-way?
The cheapest airline one-way is British Airways, with whom users have recently found tickets for as low as £340. However, be on the lookout for offers from Icelandair and Alaska Airlines, as they are both options that can get you from London Heathrow Airport to Seattle for a low price.
What are the most reliable airlines from London Heathrow Airport to Seattle?
Consider Scandinavian Airlines (83%), KLM (83%) or SAUDIA (83%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Seattle.
What are the cheapest flights from London Heathrow Airport to Seattle?
The cheapest flight price from London Heathrow Airport to Seattle is £350. On average you can expect to pay £1,757. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for £348.
Can I find deals for flights from Heathrow to Seattle that include hotel bookings?
Yes. In addition to deals on Heathrow to Seattle flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Heathrow to Seattle?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Seattle.
Can I find deals for business class flights from Heathrow to Seattle?
Yes. Cheapflights offers flight deals from Heathrow to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from London Heathrow Airport to Seattle?
Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of £489). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £676). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Federal Way

SeaTac

Browse thousands of different options on Cheapflights for your next trip

Airlines

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Complete your trip

Direct flights to Washington

Flights by cabin class

Other flight options

Other flights from Heathrow

Popular flights

Seattle flight routes

Fly from Heathrow to Seattle on these airlines

Virgin Atlantic flights from London Heathrow to Seattle/Tacoma Intl

British Airways flights from London Heathrow to Seattle/Tacoma Intl

Finnair flights from London Heathrow to Seattle/Tacoma Intl

Top 10 airlines flying from Heathrow to Seattle

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£333	Average£491	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Lufthansa	Cheapest£339	Average£528	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£375	Average£496	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Aer Lingus	Cheapest£397	Average£656	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Delta	Cheapest£404	Average£647	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Virgin Atlantic	Cheapest£413	Average£605	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Air France	Cheapest£415	Average£615	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Alaska Airlines	Cheapest£432	Average£586	FlexibilityNo cancel fee	On-time75%	Search Alaska Airlines flights
KLM	Cheapest£434	Average£626	FlexibilityNo cancel fee	On-time75%	Search KLM flights
British Airways	Cheapest£444	Average£647	FlexibilityNo cancel fee	On-time70%	Search British Airways flights

Fly with Cheapflights

How does Cheapflights help users find flights from Heathrow to Seattle?

Deals for Heathrow to Seattle flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Heathrow to Seattle?

Cheapflights helps you find that perfect flight to Seattle from Heathrow by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Heathrow to Seattle with no change fees?

Need flexible booking options for your flight to Seattle from Heathrow? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Heathrow to Seattle become cheaper?

Yes! Start tracking prices for Heathrow to Seattle flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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Cheap flights from London Heathrow Airport to Seattle from £391

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 19/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Heathrow to Seattle

Cheapest flights from Heathrow to SeattleExplore the most affordable flight options available from Heathrow to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 October 2026.

Explore the most affordable flight options available from Heathrow to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 October 2026.

Best flights from Heathrow to SeattleDiscover carefully curated flight deals from Heathrow to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 13 October 2026.

Discover carefully curated flight deals from Heathrow to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 13 October 2026.

Direct flights from Heathrow to SeattleExplore direct flight options from Heathrow to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 13 October 2026.

Explore direct flight options from Heathrow to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 13 October 2026.

Last-minute flights from Heathrow to SeattleDiscover last-minute flight deals from Heathrow to Seattle. Data last updated 13 October 2026 and is based on user searches.

Discover last-minute flight deals from Heathrow to Seattle. Data last updated 13 October 2026 and is based on user searches.

One-way flights from Heathrow to SeattleSearch for one-way flight options from Heathrow to Seattle. Find affordable one-way fares based on user searches. Data last updated 13 October 2026.

Search for one-way flight options from Heathrow to Seattle. Find affordable one-way fares based on user searches. Data last updated 13 October 2026.

Find flight deals from Heathrow to Seattle

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Cheapflights Fare Finder

Use the filters below to find and compare flights from London Heathrow Airport to Seattle that are best for you.

Best time to book a flight from Heathrow to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Heathrow with our price prediction graph.

Cheapflights Insights

How far ahead should I book a flight from London Heathrow Airport to Seattle?

The best time to book flights from London Heathrow Airport to Seattle is 56 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from London Heathrow Airport to Seattle?

What is the cheapest time of day to fly from LHR to SEA?

When flying from London Heathrow Airport to Seattle, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost for a return flight from London Heathrow Airport to Seattle?

Airfare is below average for this route at the moment.

London Heathrow Airport to Seattle flights typically cost between £438 and £596 in December.The cheapest return price found within the last 5 days was £413 on Icelandair (15 Dec–25 Dec).

Weekly flight availability from London Heathrow Airport to Seattle

The most flights from LHR to SEA are scheduled on a Monday (24 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (24 on average).

How often are flights from London to Seattle delayed?

About 12% of weekly flights between London and Seattle have experienced delays in the past year, with the average delay time being 134 minutes.

What is the most punctual flight time for London to Seattle flights?

Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Sunday tends to have the lowest number of delays on this route, whereas Friday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on London to Seattle flights?

Over the past year, Delta have had the lowest number of delays on this route, with just 5% of flights being delayed.

What’s the top stopover airport for flights from London Heathrow Airport to Seattle?

Reykjavik (KEF) – chosen by Cheapflights users on 75% of one-stop itineraries from London Heathrow Airport to Seattle on Cheapflights.

What’s the cheapest stopover airport for flights from London Heathrow Airport to Seattle?

Dallas (DFW) is the most affordable one-stop option, with an average return flight price of £501.

What’s the fastest stopover option from London Heathrow Airport to Seattle?

Flights via Vancouver (YVR) have the shortest average one-way travel time for one-stop routes: 12h 46m.

Which airport typically offers the quickest stopover for flights from London Heathrow Airport to Seattle?

Flights via Dallas (DFW) offer the fastest connection on this route, with an average stopover time of 1h 49m.

Reviews of airlines servicing Seattle

See what other customers who have flown with Alaska Airlines,KLM, andVirgin Atlantic from London Heathrow Airport to Seattle have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

What airport do you fly into for flights to Seattle from London Heathrow?

How long is the flight from London Heathrow Airport to Seattle?

What are the cheapest airlines flying from London Heathrow Airport to Seattle round-trip?

What are the cheapest airlines to fly from London Heathrow Airport to Seattle one-way?

What are the most reliable airlines from London Heathrow Airport to Seattle?

What are the cheapest flights from London Heathrow Airport to Seattle?

Can I find deals for flights from Heathrow to Seattle that include hotel bookings?

How can I find direct flights from Heathrow to Seattle?

Can I find deals for business class flights from Heathrow to Seattle?

What is the cheapest month to book a flight from London Heathrow Airport to Seattle?

Travelling to a place near Seattle?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Fly from Heathrow to Seattle on these airlines

Choose from the following airlines for your flight from Heathrow to Seattle. Flights are based on user searches made on Cheapflights and were last updated on 13 October 2026.

Alternative routes for Heathrow to Seattle

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Seattle by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to Washington

Book a non-stop flight to one of these other cities located in Washington.

Search flights from Heathrow to Seattle by cabin class

Find flights from Heathrow to Seattle, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Heathrow and Seattle flights

Browse other Heathrow and Seattle flight options. Last updated on 13 October 2026.

Cheapest flights from Heathrow to Seattle
Explore the most affordable flight options available from Heathrow to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 October 2026.

Best flights from Heathrow to Seattle
Discover carefully curated flight deals from Heathrow to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 13 October 2026.

Direct flights from Heathrow to Seattle
Explore direct flight options from Heathrow to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 13 October 2026.

Last-minute flights from Heathrow to Seattle
Discover last-minute flight deals from Heathrow to Seattle. Data last updated 13 October 2026 and is based on user searches.

One-way flights from Heathrow to Seattle
Search for one-way flight options from Heathrow to Seattle. Find affordable one-way fares based on user searches. Data last updated 13 October 2026.

London Heathrow Airport to Seattle flights typically cost between £438 and £596 in December.
The cheapest return price found within the last 5 days was £413 on Icelandair (15 Dec–25 Dec).