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

For as low as $642, Virgin Atlantic can have you in Seattle from London Heathrow Airport in 10h 05m. 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 Iberia - these airlines can fly you to your destination from $560 and $575, 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 Wednesday (25 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 $671. On average you can expect to pay $2,349. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for $516.

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 (90%) and Air France (90%).

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 is the cheapest day to fly round-trip from London Heathrow Airport to Seattle?

Flying to your destination on a Thursday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to Seattle. Check prices with Cheapflights to find a great deal for your trip.

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

Find a great deal and save up to 40% by booking at least 45 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from London Heathrow Airport to Seattle within the next two weeks, with the cheapest ticket starting at $741.

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

January can be a great time to fly to Seattle from London Heathrow Airport with a flight ticket averaging about $742. Cheapflights users have found deals in the month of January for as cheap as $437. The most expensive prices can be found in the month of August.

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 6 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.

$525+ Flights from London Heathrow Airport to Seattle

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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.

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Cheapflights Tip: The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in February or November, booked 62 days in advance, depart on a Wednesday or Thursday and return on a Tuesday

Cheap flight deals from Heathrow to Seattle

Round-trip from	$641 (TravelUp)
One-way from	$525 (Kiwi.com)
Popular in	July
Cheapest in	February
Average price	$904
Good round-trip deal	$753 or less
Good one-way deal	$762 or less

From London Heathrow to Seattle/Tacoma Intl

Search Deals

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

Search Deals

Highest demand for flights based on searches. 12% potential increase in price ($112 potential increase over avg. RT price).

Search Deals

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 August 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 August 21, 2025.

Tue 9/91:25 pmLHR - SEA

Nonstop10h 05mVirgin Atlantic

Tue 9/163:15 pmSEA - LHR

1 stop14h 15mVirgin Atlantic

Deal found 8/21

$641

Sun 9/286:30 amLHR - SEA

2 stops15h 46mMultiple Airlines

Mon 10/2010:00 amSEA - LHR

2 stops15h 35mMultiple Airlines

Deal found 8/21

$642

Wed 9/101:05 pmLHR - SEA

1 stop12h 45mIcelandair

Thu 9/183:45 pmSEA - LHR

1 stop12h 10mIcelandair

Deal found 8/19

$643

Sat 8/306:50 amLHR - SEA

2 stops21h 52mUnited Airlines

Sat 9/137:00 amSEA - LHR

1 stop15h 20mUnited Airlines

Deal found 8/20

$644

Fri 9/126:30 amLHR - SEA

2 stops15h 46mMultiple Airlines

Sun 9/217:15 amSEA - LHR

1 stop18h 20mMultiple Airlines

Deal found 8/19

$645

Thu 9/186:30 amLHR - SEA

1 stop13h 25mLufthansa

Sun 9/212:00 pmSEA - LHR

1 stop13h 45mLufthansa

Deal found 8/21

$646

Wed 9/37:30 amLHR - SEA

2 stops18h 21mUnited Airlines

Wed 9/1711:11 amSEA - LHR

2 stops16h 34mUnited Airlines

Deal found 8/20

$647

Thu 10/21:05 pmLHR - SEA

1 stop12h 45mIcelandair

Fri 10/243:45 pmSEA - LHR

1 stop12h 10mIcelandair

Deal found 8/19

$648

Sat 9/204:30 pmLHR - SEA

1 stop27h 25mLufthansa

Fri 10/177:00 amSEA - LHR

1 stop17h 20mLufthansa

Deal found 8/20

$649

Sun 10/59:25 pmLHR - SEA

1 stop28h 25mIcelandair

Sat 10/253:50 pmSEA - LHR

1 stop12h 00mIcelandair

Deal found 8/19

$650

Tue 12/210:35 amLHR - SEA

2 stops32h 15mFinnair

Mon 12/81:23 amSEA - LHR

1 stop21h 32mFinnair

Deal found 8/21

$651

Mon 9/227:05 pmLHR - SEA

2 stops26h 54mFinnair

Mon 10/66:10 amSEA - LHR

2 stops16h 10mFinnair

Deal found 8/20

$652

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 August 21, 2025.

Tue 12/22:45 pmLHR - SEA

Nonstop10h 05mVirgin Atlantic

Tue 12/97:20 amSEA - LHR

1 stop15h 30mVirgin Atlantic

Deal found 8/21

$642

Thu 9/46:30 amLHR - SEA

1 stop13h 25mUnited Airlines

Wed 9/107:10 amSEA - LHR

2 stops17h 10mUnited Airlines

Deal found 8/21

$642

Fri 9/266:30 amLHR - SEA

2 stops15h 46mMultiple Airlines

Wed 10/17:00 amSEA - LHR

2 stops15h 30mMultiple Airlines

Deal found 8/20

$643

Mon 2/97:30 amLHR - SEA

2 stops18h 39mUnited Airlines

Fri 2/137:03 amSEA - LHR

1 stop16h 27mUnited Airlines

Deal found 8/20

$642

Thu 9/118:40 amLHR - SEA

2 stops17h 56mMultiple Airlines

Sun 9/2110:00 amSEA - LHR

2 stops17h 50mMultiple Airlines

Deal found 8/20

$644

Sun 9/216:30 amLHR - SEA

1 stop13h 25mUnited Airlines

Mon 9/297:00 amSEA - LHR

2 stops17h 20mUnited Airlines

Deal found 8/20

$643

Fri 9/126:30 amLHR - SEA

2 stops15h 46mMultiple Airlines

Sun 9/147:15 amSEA - LHR

1 stop18h 20mMultiple Airlines

Deal found 8/20

$645

Thu 9/46:50 amLHR - SEA

2 stops19h 59mUnited Airlines

Thu 9/1111:11 amSEA - LHR

1 stop17h 09mUnited Airlines

Deal found 8/21

$643

Tue 9/26:50 amLHR - SEA

2 stops21h 52mUnited Airlines

Fri 9/1210:55 amSEA - LHR

1 stop16h 50mUnited Airlines

Deal found 8/21

$643

Mon 9/16:50 amLHR - SEA

2 stops21h 52mUnited Airlines

Tue 9/912:15 pmSEA - LHR

1 stop13h 55mUnited Airlines

Deal found 8/20

$644

Wed 9/36:50 amLHR - SEA

2 stops19h 59mUnited Airlines

Fri 9/123:19 pmSEA - LHR

1 stop14h 51mUnited Airlines

Deal found 8/20

$644

Last-minute flights from Heathrow to Seattle
Discover last-minute flight deals from Heathrow to Seattle. Data last updated August 21, 2025 and is based on user searches.

Sat 8/306:50 amLHR - SEA

2 stops21h 52mUnited Airlines

Sat 9/137:00 amSEA - LHR

1 stop15h 20mUnited Airlines

Deal found 8/20

$644

Wed 9/37:30 amLHR - SEA

2 stops18h 21mUnited Airlines

Wed 9/1711:11 amSEA - LHR

2 stops16h 34mUnited Airlines

Deal found 8/20

$647

Tue 9/91:25 pmLHR - SEA

Nonstop10h 05mVirgin Atlantic

Tue 9/163:15 pmSEA - LHR

1 stop14h 15mVirgin Atlantic

Deal found 8/21

$641

Wed 9/101:05 pmLHR - SEA

1 stop12h 45mIcelandair

Thu 9/183:45 pmSEA - LHR

1 stop12h 10mIcelandair

Deal found 8/19

$643

Fri 9/126:30 amLHR - SEA

2 stops15h 46mMultiple Airlines

Sun 9/217:15 amSEA - LHR

1 stop18h 20mMultiple Airlines

Deal found 8/19

$645

Thu 9/188:40 amLHR - SEA

2 stops17h 56mMultiple Airlines

Thu 9/2510:00 amSEA - LHR

2 stops17h 50mMultiple Airlines

Deal found 8/19

$646

Fri 9/196:30 amLHR - SEA

2 stops15h 46mMultiple Airlines

Fri 9/2612:00 pmSEA - LHR

1 stop14h 00mMultiple Airlines

Deal found 8/20

$650

Sat 9/204:30 pmLHR - SEA

1 stop27h 25mLufthansa

Fri 10/177:00 amSEA - LHR

1 stop17h 20mLufthansa

Deal found 8/20

$649

Mon 9/227:05 pmLHR - SEA

2 stops26h 54mFinnair

Mon 10/66:10 amSEA - LHR

2 stops16h 10mFinnair

Deal found 8/20

$652

Tue 9/231:25 pmLHR - SEA

Nonstop10h 05mVirgin Atlantic

Mon 10/68:25 pmSEA - LHR

Nonstop9h 50mVirgin Atlantic

Deal found 8/20

$648

Tue 9/237:05 pmLHR - SEA

2 stops26h 54mFinnair

Sun 11/2312:59 amSEA - LHR

1 stop25h 26mFinnair

Deal found 8/21

$651

Sun 9/286:30 amLHR - SEA

2 stops15h 46mMultiple Airlines

Mon 10/2010:00 amSEA - LHR

2 stops15h 35mMultiple Airlines

Deal found 8/21

$642

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 August 21, 2025.

Sat 10/187:20 pmLHR - SEA

2 stops26h 40mMultiple Airlines

Deal found 8/21

$525

Fri 9/199:50 amLHR - SEA

1 stop16h 00mAer Lingus

Deal found 8/21

$527

Sun 9/218:50 pmLHR - SEA

2 stops45h 43mMultiple Airlines

Deal found 8/21

$529

Tue 11/42:50 pmLHR - SEA

1 stop31h 30mWestJet

Deal found 8/21

$532

Sat 10/49:10 pmLHR - SEA

3 stops44h 10mMultiple Airlines

Deal found 8/21

$534

Mon 10/137:50 pmLHR - SEA

2 stops33h 32mMultiple Airlines

Deal found 8/18

$536

Wed 2/42:50 pmLHR - SEA

1 stop12h 53mMultiple Airlines

Deal found 8/20

$538

Mon 9/87:40 amLHR - SEA

2 stops34h 00mMultiple Airlines

Deal found 8/19

$539

Thu 9/181:45 pmLHR - SEA

3 stops34h 00mMultiple Airlines

Deal found 8/19

$541

Mon 9/159:50 amLHR - SEA

1 stop16h 00mAer Lingus

Deal found 8/19

$542

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

Tue 12/2

2:45 pm-4:50 pm

Nonstop10h 05m

Seattle/Tacoma Intl

Tue 12/9

7:20 am-6:50 am

1 stop15h 30m

$642

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 9/4

6:30 am-11:55 am

1 stop13h 25m

Seattle/Tacoma Intl

Wed 9/10

7:10 am-8:20 am

2 stops17h 10m

$642

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 2/9

7:30 am-6:09 pm

2 stops18h 39m

Seattle/Tacoma Intl

Fri 2/13

7:03 am-7:30 am

1 stop16h 27m

$642

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 9/26

6:30 am-2:16 pm

2 stops15h 46m

Seattle/Tacoma Intl

Wed 10/1

7:00 am-6:30 am

2 stops15h 30m

$643

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 9/21

6:30 am-11:55 am

1 stop13h 25m

Seattle/Tacoma Intl

Mon 9/29

7:00 am-8:20 am

2 stops17h 20m

$643

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 9/4

6:50 am-6:49 pm

2 stops19h 59m

Seattle/Tacoma Intl

Thu 9/11

11:11 am-12:20 pm

1 stop17h 09m

$643

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 9/2

6:50 am-8:42 pm

2 stops21h 52m

Seattle/Tacoma Intl

Fri 9/12

10:55 am-11:45 am

1 stop16h 50m

$643

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 9/11

8:40 am-6:36 pm

2 stops17h 56m

Seattle/Tacoma Intl

Sun 9/21

10:00 am-11:50 am

2 stops17h 50m

$644

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 9/1

6:50 am-8:42 pm

2 stops21h 52m

Seattle/Tacoma Intl

Tue 9/9

12:15 pm-10:10 am

1 stop13h 55m

$644

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 9/3

6:50 am-6:49 pm

2 stops19h 59m

Seattle/Tacoma Intl

Fri 9/12

3:19 pm-2:10 pm

1 stop14h 51m

$644

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/21

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 62 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 $388). 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 10% 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.

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

7,981 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

7,981 reviews

Delta

8.0

Very good

7,981 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

658 reviews

Delta

8.0

Very good

7,981 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

7,981 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

529 reviews

Delta

8.0

Very good

7,981 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

7,291 reviews

Delta

8.0

Very good

7,981 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 6 different airlines.
How long is the flight from London Heathrow Airport to Seattle?
For as low as $642, Virgin Atlantic can have you in Seattle from London Heathrow Airport in 10h 05m. 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 Iberia - these airlines can fly you to your destination from $560 and $575, 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 (90%) and Air France (90%).
What are the cheapest flights from London Heathrow Airport to Seattle?
The cheapest flight price from London Heathrow Airport to Seattle is $671. On average you can expect to pay $2,349. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for $516.
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 $388). 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 6 airlines flying from Heathrow to Seattle

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest$449	Average$644	FlexibilityNo cancel fee	On-time76%
British Airways	Cheapest$560	Average$761	FlexibilityNo cancel fee	On-time70%
Iberia	Cheapest$575	Average$728	FlexibilityNo cancel fee	On-time77%
Virgin Atlantic	Cheapest$594	Average$901	FlexibilityNo cancel fee	On-time72%
American Airlines	Cheapest$620	Average$789	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$621	Average$815	FlexibilityNo cancel fee	On-timeN/A

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$525+ 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 10/18. 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 November, booked 62 days in advance, depart on a Wednesday or Thursday 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 August 21, 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 August 21, 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?

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?

Traveling to a place near Seattle?

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Alternative routes for Heathrow to Seattle

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Top 6 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 August 21, 2025.