How often are flights from London to Seattle delayed?

About 15% of weekly flights between London and Seattle have experienced delays in the past year, with the average delay time being 127 minutes.

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 Wednesday 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 last year, Scandinavian Airlines have had the lowest number of delays on this route, with just 4% of flights being delayed.

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.

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

For as low as $650, Delta can have you in Seattle from London Heathrow Airport in 19h 56m. Airlines will cover a distance of 4783 mi.

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

Currently priced at $497, 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 American Airlines - these airlines can fly you to your destination from $560 and $589, respectively. Users have found that Icelandair is 35% cheaper than the other options available to this destination.

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

For one-way options, check prices for Aer Lingus. According to our data, you can fly for as low as $546. Users have also found prices from $548 and $557 on Lufthansa and United Airlines, respectively.

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 $555. On average you can expect to pay $2,279. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for $540.

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 (87%) and Air France (87%).

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

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

Most accurate provider : When it comes to deals on London Heathrow Airport-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London Heathrow Airport-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London Heathrow Airport-Seattle flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on London Heathrow Airport-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London Heathrow Airport-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 8 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.

$542+ Flights from London Heathrow Airport to Seattle

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

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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 Thursday and return on a Wednesday

Cheap flight deals from Heathrow to Seattle

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$595 (Gotogate)
One-way from	$542 (Cheapflightsfares)
Popular in	December
Cheapest in	February
Average price	$756
Good round-trip deal	$775 or less
Good one-way deal	$656 or less

Provider with most accurate pricing for London Heathrow-Seattle/Tacoma Intl flight deals.

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Provider most trusted by Cheapflights users for London Heathrow-Seattle/Tacoma Intl flights.

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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. 2% potential increase in price ($21 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 October 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 October 23, 2025.

Wed 11/512:15 pmLHR - SEA

1 stop12h 45mIcelandair

Wed 4/297:00 pmSEA - LHR

1 stop32h 55mIcelandair

Deal found 10/22

$595

Sun 12/148:35 pmLHR - SEA

1 stop28h 25mIcelandair

Tue 1/62:35 pmSEA - LHR

1 stop20h 55mIcelandair

Deal found 10/22

$600

Wed 11/1912:15 pmLHR - SEA

1 stop12h 45mIcelandair

Wed 11/262:35 pmSEA - LHR

1 stop12h 15mIcelandair

Deal found 10/22

$601

Wed 12/312:15 pmLHR - SEA

1 stop12h 45mIcelandair

Thu 12/112:35 pmSEA - LHR

1 stop20h 55mIcelandair

Deal found 10/23

$603

Mon 11/38:35 pmLHR - SEA

1 stop28h 25mIcelandair

Mon 11/102:35 pmSEA - LHR

1 stop12h 15mIcelandair

Deal found 10/22

$604

Tue 12/28:35 pmLHR - SEA

1 stop28h 25mIcelandair

Tue 12/92:35 pmSEA - LHR

1 stop12h 15mIcelandair

Deal found 10/23

$606

Wed 11/512:15 pmLHR - SEA

1 stop12h 45mIcelandair

Wed 11/122:35 pmSEA - LHR

1 stop12h 15mIcelandair

Deal found 10/21

$607

Mon 11/108:35 pmLHR - SEA

1 stop28h 25mIcelandair

Mon 11/172:35 pmSEA - LHR

1 stop20h 55mIcelandair

Deal found 10/22

$609

Wed 11/1912:15 pmLHR - SEA

1 stop12h 45mIcelandair

Tue 11/252:35 pmSEA - LHR

1 stop12h 15mIcelandair

Deal found 10/22

$619

Tue 11/2512:15 pmLHR - SEA

1 stop12h 45mIcelandair

Mon 12/12:35 pmSEA - LHR

1 stop12h 15mIcelandair

Deal found 10/20

$620

Tue 11/412:15 pmLHR - SEA

1 stop12h 45mIcelandair

Tue 11/112:35 pmSEA - LHR

1 stop12h 15mIcelandair

Deal found 10/21

$621

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 October 23, 2025.

Wed 12/246:30 amLHR - SEA

2 stops19h 56mDelta

Mon 12/2912:55 amSEA - LHR

1 stop22h 10mDelta

Deal found 10/21

$650

Wed 3/186:30 amLHR - SEA

1 stop13h 05mMultiple Airlines

Wed 3/255:40 pmSEA - LHR

Nonstop9h 50mMultiple Airlines

Deal found 10/21

$654

Thu 11/2712:15 pmLHR - SEA

1 stop12h 45mIcelandair

Mon 12/12:35 pmSEA - LHR

1 stop20h 55mIcelandair

Deal found 10/22

$673

Tue 3/106:30 amLHR - SEA

1 stop13h 40mUnited Airlines

Tue 3/178:30 amSEA - LHR

2 stops17h 40mUnited Airlines

Deal found 10/21

$676

Mon 12/296:30 amLHR - SEA

2 stops22h 14mDelta

Thu 3/197:50 amSEA - LHR

2 stops19h 25mDelta

Deal found 10/20

$659

Wed 3/186:35 amLHR - SEA

2 stops21h 42mUnited Airlines

Wed 3/257:00 amSEA - LHR

2 stops16h 40mUnited Airlines

Deal found 10/21

$680

Mon 12/296:30 amLHR - SEA

2 stops19h 56mDelta

Thu 3/54:45 pmSEA - LHR

Nonstop9h 45mDelta

Deal found 10/21

$659

Fri 12/266:30 amLHR - SEA

1 stop13h 20mDelta

Tue 12/307:20 pmSEA - LHR

Nonstop9h 30mDelta

Deal found 10/21

$661

Fri 12/2612:20 pmLHR - SEA

Nonstop10h 38mDelta

Wed 12/314:48 pmSEA - LHR

Nonstop9h 42mDelta

Deal found 10/21

$677

Mon 12/299:40 amLHR - SEA

1 stop33h 05mDelta

Tue 3/178:20 pmSEA - LHR

Nonstop9h 30mDelta

Deal found 10/20

$677

Mon 12/296:30 amLHR - SEA

2 stops22h 14mDelta

Fri 3/201:30 pmSEA - LHR

1 stop13h 30mDelta

Deal found 10/20

$686

Last-minute flights from Heathrow to Seattle
Discover last-minute flight deals from Heathrow to Seattle. Data last updated October 23, 2025 and is based on user searches.

Mon 11/38:35 pmLHR - SEA

1 stop28h 25mIcelandair

Mon 11/102:35 pmSEA - LHR

1 stop12h 15mIcelandair

Deal found 10/22

$604

Tue 11/412:15 pmLHR - SEA

1 stop12h 45mIcelandair

Tue 11/112:35 pmSEA - LHR

1 stop12h 15mIcelandair

Deal found 10/21

$621

Wed 11/512:15 pmLHR - SEA

1 stop12h 45mIcelandair

Wed 4/297:00 pmSEA - LHR

1 stop32h 55mIcelandair

Deal found 10/22

$595

Wed 11/512:15 pmLHR - SEA

1 stop12h 45mIcelandair

Wed 11/122:35 pmSEA - LHR

1 stop12h 15mIcelandair

Deal found 10/21

$607

Mon 11/108:35 pmLHR - SEA

1 stop28h 25mIcelandair

Mon 11/172:35 pmSEA - LHR

1 stop20h 55mIcelandair

Deal found 10/22

$609

Mon 11/108:35 pmLHR - SEA

1 stop28h 25mIcelandair

Mon 11/242:35 pmSEA - LHR

1 stop12h 15mIcelandair

Deal found 10/22

$624

Wed 11/1212:15 pmLHR - SEA

1 stop12h 45mIcelandair

Thu 11/202:35 pmSEA - LHR

1 stop12h 15mIcelandair

Deal found 10/22

$622

Wed 11/1912:15 pmLHR - SEA

1 stop12h 45mIcelandair

Wed 11/262:35 pmSEA - LHR

1 stop12h 15mIcelandair

Deal found 10/22

$601

Wed 11/1912:15 pmLHR - SEA

1 stop12h 45mIcelandair

Tue 11/252:35 pmSEA - LHR

1 stop12h 15mIcelandair

Deal found 10/22

$619

Tue 11/2512:15 pmLHR - SEA

1 stop12h 45mIcelandair

Mon 12/12:35 pmSEA - LHR

1 stop12h 15mIcelandair

Deal found 10/20

$620

Tue 11/258:35 pmLHR - SEA

1 stop28h 25mIcelandair

Mon 12/292:35 pmSEA - LHR

1 stop20h 55mIcelandair

Deal found 10/23

$631

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 October 23, 2025.

Wed 11/129:50 amLHR - SEA

2 stops21h 28mAer Lingus

Deal found 10/20

$542

Tue 11/49:50 amLHR - SEA

2 stops21h 28mAer Lingus

Deal found 10/21

$543

Wed 11/198:15 amLHR - SEA

2 stops34h 10mMultiple Airlines

Deal found 10/20

$545

Sun 11/238:15 amLHR - SEA

3 stops34h 10mMultiple Airlines

Deal found 10/20

$548

Thu 11/201:40 pmLHR - SEA

2 stops28h 45mMultiple Airlines

Deal found 10/20

$550

Wed 12/102:55 pmLHR - SEA

Nonstop10h 00mAmerican Airlines

Deal found 10/21

$551

Thu 12/117:30 amLHR - SEA

3 stops23h 45mUnited Airlines

Deal found 10/21

$553

Thu 12/112:55 pmLHR - SEA

Nonstop10h 00mAmerican Airlines

Deal found 10/21

$555

Sun 12/148:30 amLHR - SEA

1 stop35h 40mUnited Airlines

Deal found 10/21

$557

Tue 11/258:35 pmLHR - SEA

1 stop28h 25mIcelandair

Deal found 10/22

$558

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

Wed 12/24

6:30 am-6:26 pm

2 stops19h 56m

Seattle/Tacoma Intl

Mon 12/29

12:55 am-7:05 am

1 stop22h 10m

$650

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 3/18

6:30 am-12:35 pm

1 stop13h 05m

Seattle/Tacoma Intl

Wed 3/25

5:40 pm-10:30 am

Nonstop9h 50m

$654

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 12/29

6:30 am-8:44 pm

2 stops22h 14m

Seattle/Tacoma Intl

Thu 3/19

7:50 am-10:15 am

2 stops19h 25m

$659

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 12/29

6:30 am-6:26 pm

2 stops19h 56m

Seattle/Tacoma Intl

Thu 3/5

4:45 pm-10:30 am

Nonstop9h 45m

$659

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 12/26

6:30 am-11:50 am

1 stop13h 20m

Seattle/Tacoma Intl

Tue 12/30

7:20 pm-12:50 pm

Nonstop9h 30m

$661

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 11/27

12:15 pm-5:00 pm

1 stop12h 45m

Seattle/Tacoma Intl

Mon 12/1

2:35 pm-7:30 pm

1 stop20h 55m

$673

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 3/10

6:30 am-1:10 pm

1 stop13h 40m

Seattle/Tacoma Intl

Tue 3/17

8:30 am-9:10 am

2 stops17h 40m

$676

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 12/26

12:20 pm-2:58 pm

Nonstop10h 38m

Seattle/Tacoma Intl

Wed 12/31

4:48 pm-10:30 am

Nonstop9h 42m

$677

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 12/29

9:40 am-10:45 am

1 stop33h 05m

Seattle/Tacoma Intl

Tue 3/17

8:20 pm-12:50 pm

Nonstop9h 30m

$677

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 3/18

6:35 am-9:17 pm

2 stops21h 42m

Seattle/Tacoma Intl

Wed 3/25

7:00 am-6:40 am

2 stops16h 40m

$680

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/20

Showing 1-10 of 23 results

Compare providers for flights from Heathrow to Seattle

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Heathrow to Seattle in October.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy3 stars	Trust Score*3 stars
Cheapflightsfares	Price Accuracy2 stars	Trust Score*1 star
Priceline	Price Accuracy1 star	Trust Score*3 stars
Jetabroad	Price Accuracy3 stars	Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on London Heathrow Airport-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London Heathrow Airport-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London Heathrow Airport-Seattle flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on London Heathrow Airport-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London Heathrow Airport-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

Delays

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 $474). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of $673). 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 Sunday evenings when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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

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

7.9

Good

7,981 reviews

Reviews

1 / 20

10.0

Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!

Delta

7.9

Good

7,981 reviews

Delta

7.9

Good

7,981 reviews

Reviews

1 / 20

10.0

Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!

Virgin Atlantic

7.5

Good

670 reviews

Delta

7.9

Good

7,981 reviews

Reviews

1 / 20

10.0

Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!

American Airlines

7.2

Good

11,031 reviews

Delta

7.9

Good

7,981 reviews

Reviews

1 / 20

10.0

Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!

Icelandair

7.1

Good

561 reviews

Delta

7.9

Good

7,981 reviews

Reviews

1 / 20

10.0

Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!

British Airways

6.7

Okay

7,468 reviews

Delta

7.9

Good

7,981 reviews

Reviews

1 / 20

10.0

Excellent

Mary,Oct 2025

AMS - PDX

It's specail being able to fly non-stop from Amsterdam all the way home to Portland, Oregon!

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 8 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 $650, Delta can have you in Seattle from London Heathrow Airport in 19h 56m. Airlines will cover a distance of 4783 mi.
What are the cheapest airlines flying from London Heathrow Airport to Seattle round-trip?
Currently priced at $497, 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 American Airlines - these airlines can fly you to your destination from $560 and $589, respectively. Users have found that Icelandair is 35% cheaper than the other options available to this destination.
What are the cheapest airlines to fly from London Heathrow Airport to Seattle one-way?
For one-way options, check prices for Aer Lingus. According to our data, you can fly for as low as $546. Users have also found prices from $548 and $557 on Lufthansa and United Airlines, respectively.
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 (87%) and Air France (87%).
What are the cheapest flights from London Heathrow Airport to Seattle?
The cheapest flight price from London Heathrow Airport to Seattle is $555. On average you can expect to pay $2,279. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for $540.
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 $474). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of $673). 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$497	Average$644	FlexibilityNo cancel fee	On-time76%
British Airways	Cheapest$560	Average$760	FlexibilityNo cancel fee	On-time70%
American Airlines	Cheapest$589	Average$813	FlexibilityNo cancel fee	On-time71%
Virgin Atlantic	Cheapest$594	Average$906	FlexibilityNo cancel fee	On-time72%
Delta	Cheapest$600	Average$825	FlexibilityNo cancel fee	On-timeN/A

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$542+ 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 11/12. 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

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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 Thursday and return on a Wednesday

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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 October 23, 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 October 23, 2025.

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

Compare providers for flights from Heathrow to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Heathrow to Seattle in October.

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 often are flights from London to Seattle delayed?

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

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

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

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

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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 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?

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Alternative routes for Heathrow 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 October 23, 2025.