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

For as low as $626, United Airlines can have you in Seattle from London Heathrow Airport in 13h 15m. Airlines will cover a distance of 4783 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

Currently priced at $449, Icelandair will fly you from London Heathrow Airport to Seattle and back. In addition to Icelandair, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from British Airways and Virgin Atlantic - these airlines can fly you to your destination from $560 and $594, respectively. Users have found that Icelandair is 41% cheaper than the other options available to this destination.

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 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

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 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

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

The cheapest flight price from London Heathrow Airport to Seattle is $627. On average you can expect to pay $2,157. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for $513.

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

The top 3 most reliable airlines when flying from London Heathrow Airport to Seattle are Scandinavian Airlines (95%), KLM (93%) and Air France (93%).

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

American Airlines, British Airways and Delta are the most popular airlines when flying from London Heathrow Airport to Seattle.

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

Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Seattle from London Heathrow. Booking flights from London Heathrow to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 18 daily inbound flights from London Heathrow from 5 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 vacation 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.

$499+ Flights from London Heathrow Airport to Seattle

Q: How much does it cost to fly round-trip 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 $623 and $757 in October. The cheapest round-trip price found within the last 3 days was $603 on Scandinavian Airlines (Oct 17-Oct 24).

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Find cheap flights from Heathrow to Seattle with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 Monday and return on a Tuesday

Cheap flight deals from Heathrow to Seattle

Round-trip from	$603 (The Travel House)
One-way from	$499 (Ovago)
Popular in	July
Cheapest in	February
Average price	$685
Good round-trip deal	$688 or less
Good one-way deal	$736 or less

From London Heathrow to Seattle/Tacoma Intl

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One-way flight from London Heathrow to Seattle/Tacoma Intl

Search Deals

Highest demand for flights based on searches. 12% potential increase in price ($108 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).

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Average for round-trip flights in September 2025

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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.

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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 September 16, 2025.

Mon 9/227:45 pmLHR - SEA

1 stop23h 30mVirgin Atlantic

Mon 10/65:35 pmSEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 9/14

$603

Wed 10/86:30 amLHR - SEA

2 stops15h 46mMultiple Airlines

Tue 10/1410:00 amSEA - LHR

2 stops15h 35mMultiple Airlines

Deal found 9/14

$605

Wed 11/512:15 pmLHR - SEA

1 stop12h 45mIcelandair

Sun 3/153:35 pmSEA - LHR

1 stop12h 15mIcelandair

Deal found 9/15

$606

Wed 10/18:20 amLHR - SEA

1 stop16h 33mFinnair

Sun 11/1612:59 amSEA - LHR

1 stop23h 16mFinnair

Deal found 9/14

$607

Sun 11/166:00 amLHR - SEA

2 stops25h 15mSWISS

Sat 11/2910:05 amSEA - LHR

2 stops16h 05mSWISS

Deal found 9/15

$608

Sun 9/286:00 amLHR - SEA

2 stops23h 15mSWISS

Wed 10/151:00 pmSEA - LHR

2 stops20h 50mSWISS

Deal found 9/16

$609

Mon 9/291:25 pmLHR - SEA

Nonstop10h 05mVirgin Atlantic

Mon 10/135:25 amSEA - LHR

1 stop20h 25mVirgin Atlantic

Deal found 9/16

$610

Fri 9/2610:50 amLHR - SEA

1 stop14h 09mLufthansa

Mon 10/131:12 pmSEA - LHR

1 stop13h 28mLufthansa

Deal found 9/16

$611

Mon 10/136:30 amLHR - SEA

1 stop13h 25mMultiple Airlines

Mon 10/202:55 pmSEA - LHR

1 stop14h 25mMultiple Airlines

Deal found 9/15

$612

Wed 10/158:40 amLHR - SEA

2 stops17h 56mAir Canada

Wed 10/222:55 pmSEA - LHR

1 stop14h 25mAir Canada

Deal found 9/15

$613

Fri 10/178:40 amLHR - SEA

2 stops17h 56mAir Canada

Mon 10/2010:00 amSEA - LHR

2 stops15h 35mAir Canada

Deal found 9/15

$614

Thu 10/168:40 amLHR - SEA

2 stops17h 56mAir Canada

Thu 10/2310:00 amSEA - LHR

2 stops15h 35mAir Canada

Deal found 9/16

$615

Best flights from Heathrow to Seattle
Discover carefully curated flight deals from Heathrow to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 16, 2025.

Sun 10/196:30 amLHR - SEA

1 stop13h 25mUnited Airlines

Sun 11/238:00 pmSEA - LHR

1 stop31h 50mUnited Airlines

Deal found 9/14

$619

Tue 11/186:30 amLHR - SEA

1 stop13h 15mDelta

Tue 12/24:50 pmSEA - LHR

Nonstop9h 40mDelta

Deal found 9/16

$626

Tue 11/2512:35 pmLHR - SEA

1 stop18h 43mBritish Airways

Tue 12/21:25 pmSEA - LHR

Nonstop9h 35mBritish Airways

Deal found 9/16

$638

Mon 10/136:30 amLHR - SEA

1 stop13h 25mUnited Airlines

Mon 10/207:00 amSEA - LHR

2 stops19h 10mUnited Airlines

Deal found 9/15

$620

Mon 11/246:30 amLHR - SEA

1 stop13h 15mDelta

Mon 12/14:50 pmSEA - LHR

Nonstop9h 40mDelta

Deal found 9/16

$626

Wed 10/86:30 amLHR - SEA

1 stop17h 35mDelta

Tue 10/145:35 pmSEA - LHR

Nonstop9h 45mDelta

Deal found 9/14

$626

Sun 9/281:05 pmLHR - SEA

2 stops33h 19mUnited Airlines

Sun 10/125:31 pmSEA - LHR

2 stops32h 04mUnited Airlines

Deal found 9/14

$626

Tue 12/211:45 amLHR - SEA

1 stop32h 05mDelta

Wed 2/184:55 pmSEA - LHR

Nonstop9h 35mDelta

Deal found 9/14

$626

Sat 10/187:30 amLHR - SEA

2 stops18h 23mUnited Airlines

Wed 10/2210:50 amSEA - LHR

2 stops16h 35mUnited Airlines

Deal found 9/14

$641

Mon 9/296:30 amLHR - SEA

2 stops16h 23mDelta

Tue 12/211:35 amSEA - LHR

1 stop14h 40mDelta

Deal found 9/16

$632

Mon 9/295:25 pmLHR - SEA

Nonstop10h 25mDelta

Mon 10/135:35 pmSEA - LHR

Nonstop9h 45mDelta

Deal found 9/16

$645

Last-minute flights from Heathrow to Seattle
Discover last-minute flight deals from Heathrow to Seattle. Data last updated September 16, 2025 and is based on user searches.

Mon 9/227:45 pmLHR - SEA

1 stop23h 30mVirgin Atlantic

Mon 10/65:35 pmSEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 9/14

$603

Mon 9/226:00 amLHR - SEA

2 stops22h 42mAustrian Airlines

Mon 10/68:00 amSEA - LHR

1 stop14h 55mAustrian Airlines

Deal found 9/15

$608

Fri 9/2610:50 amLHR - SEA

1 stop14h 09mLufthansa

Mon 10/131:12 pmSEA - LHR

1 stop13h 28mLufthansa

Deal found 9/16

$611

Sun 9/286:00 amLHR - SEA

2 stops23h 15mSWISS

Wed 10/151:00 pmSEA - LHR

2 stops20h 50mSWISS

Deal found 9/16

$609

Mon 9/292:50 pmLHR - SEA

1 stop16h 39mUnited Airlines

Mon 10/138:00 amSEA - LHR

1 stop14h 55mUnited Airlines

Deal found 9/15

$606

Mon 9/291:25 pmLHR - SEA

Nonstop10h 05mVirgin Atlantic

Mon 10/135:25 amSEA - LHR

1 stop20h 25mVirgin Atlantic

Deal found 9/16

$610

Wed 10/17:05 pmLHR - SEA

2 stops26h 54mFinnair

Sun 11/1612:59 amSEA - LHR

1 stop23h 16mFinnair

Deal found 9/14

$607

Wed 10/86:30 amLHR - SEA

2 stops15h 46mMultiple Airlines

Tue 10/1410:00 amSEA - LHR

2 stops15h 35mMultiple Airlines

Deal found 9/14

$605

Mon 10/136:30 amLHR - SEA

1 stop13h 25mMultiple Airlines

Mon 10/202:55 pmSEA - LHR

1 stop14h 25mMultiple Airlines

Deal found 9/15

$612

Wed 10/158:40 amLHR - SEA

2 stops17h 56mAir Canada

Wed 10/222:55 pmSEA - LHR

1 stop14h 25mAir Canada

Deal found 9/15

$613

Thu 10/168:40 amLHR - SEA

2 stops17h 56mAir Canada

Thu 10/2310:00 amSEA - LHR

2 stops15h 35mAir Canada

Deal found 9/16

$615

Fri 10/178:40 amLHR - SEA

2 stops17h 56mAir Canada

Mon 10/2010:00 amSEA - LHR

2 stops15h 35mAir Canada

Deal found 9/15

$614

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 September 16, 2025.

Tue 10/79:10 pmLHR - SEA

1 stop28h 40mAer Lingus

Deal found 9/15

$499

Mon 12/159:55 amLHR - SEA

2 stops32h 33mMultiple Airlines

Deal found 9/15

$502

Sat 11/298:55 amLHR - SEA

2 stops37h 25mMultiple Airlines

Deal found 9/13

$505

Wed 11/267:35 amLHR - SEA

2 stops21h 43mAmerican Airlines

Deal found 9/14

$506

Tue 10/148:50 pmLHR - SEA

3 stops31h 45mMultiple Airlines

Deal found 9/15

$508

Mon 11/108:25 amLHR - SEA

2 stops20h 53mAmerican Airlines

Deal found 9/14

$509

Tue 11/49:25 amLHR - SEA

Nonstop10h 05mFinnair

Deal found 9/14

$510

Wed 10/296:30 pmLHR - SEA

2 stops33h 07mMultiple Airlines

Deal found 9/15

$512

Wed 10/158:50 pmLHR - SEA

2 stops45h 59mMultiple Airlines

Deal found 9/16

$514

Mon 10/133:05 pmLHR - SEA

3 stops51h 32mMultiple Airlines

Deal found 9/14

$517

Thu 10/306:00 amLHR - SEA

2 stops21h 37mMultiple Airlines

Deal found 9/15

$519

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

Sun 10/19

6:30 am-11:55 am

1 stop13h 25m

Seattle/Tacoma Intl

Sun 11/23

8:00 pm-11:50 am

1 stop31h 50m

$619

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 10/13

6:30 am-11:55 am

1 stop13h 25m

Seattle/Tacoma Intl

Mon 10/20

7:00 am-10:10 am

2 stops19h 10m

$620

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 11/18

6:30 am-11:45 am

1 stop13h 15m

Seattle/Tacoma Intl

Tue 12/2

4:50 pm-10:30 am

Nonstop9h 40m

$626

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 11/24

6:30 am-11:45 am

1 stop13h 15m

Seattle/Tacoma Intl

Mon 12/1

4:50 pm-10:30 am

Nonstop9h 40m

$626

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 10/8

6:30 am-4:05 pm

1 stop17h 35m

Seattle/Tacoma Intl

Tue 10/14

5:35 pm-11:20 am

Nonstop9h 45m

$626

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 9/28

1:05 pm-2:24 pm

2 stops33h 19m

Seattle/Tacoma Intl

Sun 10/12

5:31 pm-9:35 am

2 stops32h 04m

$626

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 12/2

11:45 am-11:50 am

1 stop32h 05m

Seattle/Tacoma Intl

Wed 2/18

4:55 pm-10:30 am

Nonstop9h 35m

$626

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 9/29

6:30 am-2:53 pm

2 stops16h 23m

Seattle/Tacoma Intl

Tue 12/2

11:35 am-10:15 am

1 stop14h 40m

$632

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 11/25

12:35 pm-11:18 pm

1 stop18h 43m

Seattle/Tacoma Intl

Tue 12/2

1:25 pm-7:00 am

Nonstop9h 35m

$638

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 10/18

7:30 am-5:53 pm

2 stops18h 23m

Seattle/Tacoma Intl

Wed 10/22

10:50 am-11:25 am

2 stops16h 35m

$641

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 21 results

The best insider tips for London Heathrow Airport to Seattle flights

Cheapflights partnered with top experts to bring you the best recommendations for your London Heathrow Airport to Seattle trip

Airports

LHR

Expect long security lines at Heathrow. Ensure all liquids are in one small bag to avoid delays during manual screening.

SEA

Use the Link light rail from SEA to downtown Seattle. It's inexpensive, runs every 10 minutes, and takes less than 40 minutes.

Our travel experts

Ramsey Qubein

Expert on LHR

Brandon Schultz

Expert on SEA

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 round-trip 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 $238). Flying from London Heathrow Airport to Seattle in June is currently the most expensive (average of $387). 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?

One of the essential ways to save on airfare from London Heathrow Airport to Seattle is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight at noon could potentially save you up to 11% on airfare.

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

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

How much does it cost to fly round-trip from London Heathrow Airport to Seattle?

Reviews of airlines servicing Seattle

Get a feel of what it's like to fly with Delta, Virgin Atlantic, and American Airlines from London Heathrow Airport to Seattle by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,957 reviews

Reviews

1 / 20

6.0

Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others

Delta

8.0

Very good

7,957 reviews

Delta

8.0

Very good

7,957 reviews

Reviews

1 / 20

6.0

Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others

Virgin Atlantic

7.4

Good

664 reviews

Delta

8.0

Very good

7,957 reviews

Reviews

1 / 20

6.0

Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others

American Airlines

7.2

Good

10,000 reviews

Delta

8.0

Very good

7,957 reviews

Reviews

1 / 20

6.0

Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others

Icelandair

7.0

Good

544 reviews

Delta

8.0

Very good

7,957 reviews

Reviews

1 / 20

6.0

Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others

British Airways

6.7

Okay

7,363 reviews

Delta

8.0

Very good

7,957 reviews

Reviews

1 / 20

6.0

Good

Morgan Rae,Aug 2025

BRU - JFK

Typically I choose delta because they do a great job but this time the flight attendant in my zone was very rude and didnt offer the same treatment as she did to others

Related info for your journey

What airport do you fly into for flights to Seattle from London Heathrow?
Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Seattle from London Heathrow. Booking flights from London Heathrow to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 18 daily inbound flights from London Heathrow from 5 different airlines.
How long is the flight from London Heathrow Airport to Seattle?
For as low as $626, United Airlines can have you in Seattle from London Heathrow Airport in 13h 15m. Airlines will cover a distance of 4783 mi. Both multi-stop and nonstop flights can be found to your destination and back.
What are the cheapest airlines flying from London Heathrow Airport to Seattle round-trip?
Currently priced at $449, Icelandair will fly you from London Heathrow Airport to Seattle and back. In addition to Icelandair, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from British Airways and Virgin Atlantic - these airlines can fly you to your destination from $560 and $594, respectively. Users have found that Icelandair is 41% cheaper than the other options available to this destination.
What are the most reliable airlines from London Heathrow Airport to Seattle?
The top 3 most reliable airlines when flying from London Heathrow Airport to Seattle are Scandinavian Airlines (95%), KLM (93%) and Air France (93%).
What are the cheapest flights from London Heathrow Airport to Seattle?
The cheapest flight price from London Heathrow Airport to Seattle is $627. On average you can expect to pay $2,157. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for $513.
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 vacation 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 $238). Flying from London Heathrow Airport to Seattle in June is currently the most expensive (average of $387). 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

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Other flights to Seattle

Top 5 airlines flying from Heathrow to Seattle

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest$449	Average$609	FlexibilityNo cancel fee	On-time76%
British Airways	Cheapest$560	Average$763	FlexibilityNo cancel fee	On-time70%
Virgin Atlantic	Cheapest$594	Average$901	FlexibilityNo cancel fee	On-time72%
American Airlines	Cheapest$620	Average$777	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$621	Average$820	FlexibilityNo cancel fee	On-timeN/A

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$499+ Cheap flights from Heathrow (LHR) to Seattle (SEA)

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 10/7. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Heathrow to Seattle with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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 Monday 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 September 16, 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 September 16, 2025.

Cheapflights Fare Finder

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

The best insider tips for London Heathrow Airport to Seattle flights

Cheapflights partnered with top experts to bring you the best recommendations for your London Heathrow Airport to Seattle trip

Airports

LHR

SEA

Our travel experts

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 to fly round-trip from London Heathrow Airport to Seattle?

Weekly flight availability from London Heathrow Airport to Seattle

Reviews of airlines servicing Seattle

Get a feel of what it's like to fly with Delta, Virgin Atlantic, and American Airlines from London Heathrow Airport to Seattle by reading reviews from past customers. Users have also rated airlines 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.

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 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?

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Top 5 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 September 16, 2025.