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

Zurich (ZRH) is the most affordable one-stop option, with an average return flight price of £428.

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

Reykjavik (KEF) – chosen by Cheapflights users on 66% of one-stop itineraries from London Heathrow Airport to Seattle on Cheapflights.

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

Flights via Dublin (DUB) have the shortest average one-way travel time for one-stop routes: 13h 11m.

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

Flights via Helsinki (HEL) offer the fastest connection on this route, with an average stopover time of 1h 20m.

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

Departing from London Heathrow Airport to Seattle will take you 13h 15m. The distance from London Heathrow Airport to Seattle is about 4783 mi. This flight may include one or multiple stops.

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

According to our current data, Icelandair (£349), Air France (£379), and Lufthansa (£389) offers the cheapest pricing from London Heathrow Airport to Seattle. Icelandair is priced at 37% lower than the current average price of a flight leaving 3 months from now.

Weekly flight availability from London Heathrow Airport to Seattle

The most flights from LHR to SEA are scheduled on a Monday (21 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (10 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 £436. On average you can expect to pay £1,561. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for £376.

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

Consider Scandinavian Airlines (95%), KLM (93%) or Air France (93%) 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 American Airlines, Air Canada or Air France 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 18 flights from London Heathrow to Seattle/Tacoma Intl per day from 14 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.

£366+ Flights from London Heathrow Airport to Seattle

Q: 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 £457 and £555 in October. The cheapest return flight price found within the last 3 days was £442 on Scandinavian Airlines (17 Oct-24 Oct).

Cheapflights Tip: The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in February or September, booked 76 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap flight deals from Heathrow to Seattle

Round-trip from	£442
One-way from	£366
Popular in	July
Cheapest in	February
Average price	£502
Good round-trip deal	£511 or less
Good one-way deal	£575 or less

Scandinavian Airlines
17/10-24/10
3 total stops
54h 35m total
London to Seattle

Search Deals

Aer Lingus
7/10
1 total stop
28h 40m total
London to Seattle

Search Deals

Highest demand for flights based on searches. 12% potential increase in price (£58 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£10 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2025

Search Deals

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

Search Deals

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

Search Deals

Find flight deals from Heathrow to Seattle

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 17 September 2025.

Mon 22/908:30LHR - SEA

2 stops18h 06mAir Canada

Mon 6/1010:00SEA - LHR

2 stops15h 35mAir Canada

Deal found 15/9£442

Wed 8/1006:30LHR - SEA

2 stops15h 46mMultiple Airlines

Tue 14/1005:30SEA - LHR

2 stops17h 00mMultiple Airlines

Deal found 15/9£444

Wed 5/1112:15LHR - SEA

1 stop12h 45mIcelandair

Sun 15/315:35SEA - LHR

1 stop12h 15mIcelandair

Deal found 15/9£444

Wed 1/1010:30LHR - SEA

1 stop18h 53mFinnair

Sun 5/1000:34SEA - LHR

2 stops21h 46mFinnair

Deal found 15/9£445

Sun 16/1106:00LHR - SEA

2 stops25h 15mSWISS

Sat 29/1110:05SEA - LHR

2 stops16h 05mSWISS

Deal found 15/9£446

Sun 28/906:00LHR - SEA

2 stops23h 15mSWISS

Wed 15/1013:00SEA - LHR

2 stops20h 50mSWISS

Deal found 16/9£447

Mon 29/913:25LHR - SEA

Nonstop10h 05mVirgin Atlantic

Mon 13/1005:25SEA - LHR

1 stop20h 25mVirgin Atlantic

Deal found 16/9£447

Fri 26/910:50LHR - SEA

1 stop14h 09mLufthansa

Sun 12/1013:57SEA - LHR

1 stop13h 48mLufthansa

Deal found 16/9£448

Mon 13/1006:30LHR - SEA

1 stop13h 25mMultiple Airlines

Mon 20/1014:55SEA - LHR

1 stop14h 25mMultiple Airlines

Deal found 15/9£449

Wed 15/1008:40LHR - SEA

2 stops17h 56mAir Canada

Wed 22/1014:55SEA - LHR

1 stop14h 25mAir Canada

Deal found 15/9£449

Fri 17/1008:40LHR - SEA

2 stops17h 56mAir Canada

Mon 20/1010:00SEA - LHR

2 stops15h 35mAir Canada

Deal found 15/9£450

Thu 16/1008:40LHR - SEA

2 stops17h 56mAir Canada

Sat 8/1115:40SEA - LHR

1 stop12h 10mAir Canada

Deal found 16/9£451

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 17 September 2025.

Thu 6/1107:30LHR - SEA

2 stops18h 40mUnited Airlines

Thu 13/1119:13SEA - LHR

2 stops18h 07mUnited Airlines

Deal found 14/9£448

Tue 6/120:15LHR - SEA

1 stop25h 05mLufthansa

Tue 10/210:05SEA - LHR

2 stops16h 05mLufthansa

Deal found 16/9£449

Tue 18/1106:30LHR - SEA

1 stop13h 15mDelta

Tue 2/1216:50SEA - LHR

Nonstop9h 40mDelta

Deal found 16/9£459

Mon 1/1211:00LHR - SEA

1 stop31h 05mBritish Airways

Mon 19/110:30SEA - LHR

1 stop17h 10mBritish Airways

Deal found 16/9£460

Wed 19/1106:30LHR - SEA

1 stop13h 15mMultiple Airlines

Thu 27/1116:48SEA - LHR

Nonstop9h 42mMultiple Airlines

Deal found 16/9£461

Thu 30/1015:30LHR - SEA

1 stop28h 40mUnited Airlines

Tue 4/1108:36SEA - LHR

2 stops17h 49mUnited Airlines

Deal found 16/9£448

Mon 24/1106:30LHR - SEA

1 stop13h 15mDelta

Mon 1/1216:50SEA - LHR

Nonstop9h 40mDelta

Deal found 16/9£459

Mon 13/1006:30LHR - SEA

1 stop13h 25mUnited Airlines

Mon 20/1007:00SEA - LHR

2 stops19h 10mUnited Airlines

Deal found 15/9£455

Tue 2/1211:45LHR - SEA

1 stop32h 05mDelta

Wed 18/216:55SEA - LHR

Nonstop9h 35mDelta

Deal found 14/9£459

Wed 19/1106:30LHR - SEA

1 stop13h 15mDelta

Wed 26/1116:48SEA - LHR

Nonstop9h 42mDelta

Deal found 16/9£461

Mon 17/1106:30LHR - SEA

1 stop13h 15mDelta

Wed 26/1116:48SEA - LHR

Nonstop9h 42mDelta

Deal found 16/9£461

Mon 17/1106:30LHR - SEA

1 stop13h 15mDelta

Tue 25/1119:20SEA - LHR

Nonstop9h 30mDelta

Deal found 16/9£461

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 17 September 2025.

Wed 8/1013:25LHR - SEA

Nonstop10h 05mVirgin Atlantic

Tue 14/1017:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 15/9£444

Mon 17/1112:20LHR - SEA

Nonstop10h 28mVirgin Atlantic

Wed 26/1116:48SEA - LHR

Nonstop9h 42mVirgin Atlantic

Deal found 16/9£444

Tue 24/214:45LHR - SEA

Nonstop10h 05mVirgin Atlantic

Tue 3/319:20SEA - LHR

Nonstop9h 30mVirgin Atlantic

Deal found 16/9£445

Mon 29/913:25LHR - SEA

Nonstop10h 05mVirgin Atlantic

Mon 13/1017:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 15/9£448

Tue 10/309:25LHR - SEA

Nonstop10h 05mBritish Airways

Tue 17/314:25SEA - LHR

Nonstop9h 35mBritish Airways

Deal found 15/9£450

Tue 2/1214:55LHR - SEA

Nonstop10h 00mBritish Airways

Wed 18/218:50SEA - LHR

Nonstop9h 30mBritish Airways

Deal found 14/9£459

Mon 6/1013:25LHR - SEA

Nonstop10h 05mVirgin Atlantic

Mon 20/1017:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 15/9£460

Tue 14/1013:25LHR - SEA

Nonstop10h 05mVirgin Atlantic

Mon 20/1017:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 14/9£461

Last-minute flights from Heathrow to Seattle
Discover last-minute flight deals from Heathrow to Seattle. Data last updated 17 September 2025 and is based on user searches.

Mon 22/908:30LHR - SEA

2 stops18h 06mAir Canada

Mon 6/1010:00SEA - LHR

2 stops15h 35mAir Canada

Deal found 15/9£442

Mon 22/919:45LHR - SEA

1 stop23h 30mVirgin Atlantic

Mon 6/1021:59SEA - LHR

1 stop14h 01mVirgin Atlantic

Deal found 15/9£445

Mon 22/906:00LHR - SEA

2 stops22h 42mAustrian Airlines

Mon 6/1008:00SEA - LHR

1 stop14h 55mAustrian Airlines

Deal found 15/9£446

Tue 23/914:05LHR - SEA

2 stops27h 17mAir Canada

Sun 12/1007:15SEA - LHR

1 stop15h 15mAir Canada

Deal found 16/9£456

Wed 24/913:05LHR - SEA

1 stop12h 45mIcelandair

Thu 16/1015:45SEA - LHR

1 stop12h 10mIcelandair

Deal found 16/9£455

Thu 25/906:30LHR - SEA

1 stop13h 25mLufthansa

Sun 12/1013:12SEA - LHR

1 stop13h 28mLufthansa

Deal found 16/9£449

Fri 26/910:50LHR - SEA

1 stop14h 09mLufthansa

Mon 13/1013:12SEA - LHR

1 stop13h 28mLufthansa

Deal found 16/9£448

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 17 September 2025.

Tue 7/1021:10LHR - SEA

1 stop28h 40mAer Lingus

Deal found 15/9£366

Mon 15/1209:55LHR - SEA

2 stops32h 33mMultiple Airlines

Deal found 15/9£368

Tue 14/1020:50LHR - SEA

3 stops31h 45mMultiple Airlines

Deal found 15/9£372

Fri 14/1106:00LHR - SEA

2 stops22h 46mMultiple Airlines

Deal found 15/9£373

Tue 4/1109:25LHR - SEA

Nonstop10h 05mFinnair

Deal found 15/9£374

Wed 29/1018:30LHR - SEA

2 stops33h 07mMultiple Airlines

Deal found 15/9£375

Wed 15/1020:50LHR - SEA

2 stops45h 59mMultiple Airlines

Deal found 16/9£377

Sun 14/1209:55LHR - SEA

2 stops34h 40mMultiple Airlines

Deal found 15/9£379

Thu 30/1006:00LHR - SEA

2 stops21h 37mMultiple Airlines

Deal found 15/9£381

Thu 4/1214:50LHR - SEA

1 stop31h 30mWestJet

Deal found 15/9£381

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

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 6/11

07:30-18:10

2 stops18h 40m

Seattle/Tacoma Intl

Thu 13/11

19:13-21:20

2 stops18h 07m

£448

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 30/10

15:30-13:10

1 stop28h 40m

Seattle/Tacoma Intl

Tue 4/11

08:36-10:25

2 stops17h 49m

£448

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 6/1

20:15-13:20

1 stop25h 05m

Seattle/Tacoma Intl

Tue 10/2

10:05-10:10

2 stops16h 05m

£449

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 13/10

06:30-11:55

1 stop13h 25m

Seattle/Tacoma Intl

Mon 20/10

07:00-10:10

2 stops19h 10m

£455

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 18/11

06:30-11:45

1 stop13h 15m

Seattle/Tacoma Intl

Tue 2/12

16:50-10:30

Nonstop9h 40m

£459

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 24/11

06:30-11:45

1 stop13h 15m

Seattle/Tacoma Intl

Mon 1/12

16:50-10:30

Nonstop9h 40m

£459

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 2/12

11:45-11:50

1 stop32h 05m

Seattle/Tacoma Intl

Wed 18/2

16:55-10:30

Nonstop9h 35m

£459

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 1/12

11:00-10:05

1 stop31h 05m

Seattle/Tacoma Intl

Mon 19/1

10:30-11:40

1 stop17h 10m

£460

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 19/11

06:30-11:45

1 stop13h 15m

Seattle/Tacoma Intl

Thu 27/11

16:48-10:30

Nonstop9h 42m

£461

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 19/11

06:30-11:45

1 stop13h 15m

Seattle/Tacoma Intl

Wed 26/11

16:48-10:30

Nonstop9h 42m

£461

Flights are sorted by cheapest return flights first.

Deals found on 15/9

Showing 1-10 of 23 results

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.

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

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 76 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 £622). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £946). 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?

It’s typically best to fly out from London Heathrow Airport to Seattle in the evening. Doing so could potentially save you 18% on the flight price compared to flying in the afternoon, which is usually more expensive.

What is the cheapest day to fly from London Heathrow Airport to Seattle?

Travellers seeking maximum savings on their London Heathrow Airport to Seattle flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday at midday flights should be avoided if possible as fares are typically the most expensive at this time.

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

Reviews of airlines servicing Seattle

See what other customers who have flown with KLM, Air France, 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.

KLM

7.8

Good

1,386 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

KLM

7.8

Good

1,386 reviews

KLM

7.8

Good

1,386 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Air France

7.4

Good

1,468 reviews

KLM

7.8

Good

1,386 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Virgin Atlantic

7.4

Good

664 reviews

KLM

7.8

Good

1,386 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Icelandair

7.0

Good

544 reviews

KLM

7.8

Good

1,386 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

British Airways

6.7

Okay

7,363 reviews

KLM

7.8

Good

1,386 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

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 18 flights from London Heathrow to Seattle/Tacoma Intl per day from 14 different airlines.
How long is the flight from London Heathrow Airport to Seattle?
Departing from London Heathrow Airport to Seattle will take you 13h 15m. The distance from London Heathrow Airport to Seattle is about 4783 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from London Heathrow Airport to Seattle round-trip?
According to our current data, Icelandair (£349), Air France (£379), and Lufthansa (£389) offers the cheapest pricing from London Heathrow Airport to Seattle. Icelandair is priced at 37% lower than the current average price of a flight leaving 3 months from now.
What are the most reliable airlines from London Heathrow Airport to Seattle?
Consider Scandinavian Airlines (95%), KLM (93%) or Air France (93%) 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 £436. On average you can expect to pay £1,561. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for £376.
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 £622). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £946). 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

Tacoma

Leavenworth

Bothell

SeaTac

Browse thousands of different options on Cheapflights for your next trip

Top 10 airlines flying from Heathrow to Seattle

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£349	Average£464	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Air France	Cheapest£379	Average£566	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Lufthansa	Cheapest£389	Average£486	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Finnair	Cheapest£390	Average£535	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
KLM	Cheapest£398	Average£559	FlexibilityNo cancel fee	On-time75%	Search KLM flights
United Airlines	Cheapest£399	Average£636	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Aer Lingus	Cheapest£400	Average£652	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
British Airways	Cheapest£421	Average£587	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Virgin Atlantic	Cheapest£432	Average£567	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Delta	Cheapest£438	Average£586	FlexibilityNo cancel fee	On-timeN/A	Search Delta 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 £366

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in February or September, booked 76 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap 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

Find 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 17 September 2025.

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 17 September 2025.

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

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

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

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?

What is the cheapest day to fly from London Heathrow Airport to Seattle?

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

Weekly flight availability from London Heathrow Airport to Seattle

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

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

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

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

Reviews of airlines servicing Seattle

See what other customers who have flown with KLM, Air France, 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

Find useful and relevant information for your journey from Heathrow to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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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 17 September 2025.

Top 10 airlines flying from Heathrow to Seattle

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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 17 September 2025.