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$265+ Cheap flights from Seattle (SEA) to Heathrow (LHR)

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 7/13. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
Apr 21 — Apr 281
Mon 4/21
Mon 4/28
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to London Heathrow are usually found in March or November, booked 32 days in advance, depart on a Tuesday or Monday and return on a Wednesday

Cheap flight deals from Seattle to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated April 16, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$530
(Gotogate)

One-way from

$265
(Mytrip)

Popular in

June

Cheapest in

March

Average price

$703

Good round-trip deal

$722 or less

Good one-way deal

$489 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-London Heathrow flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-London Heathrow flights.
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From Seattle/Tacoma Intl to London Heathrow
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One-way flight from Seattle/Tacoma Intl to London Heathrow
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Highest demand for flights based on searches. 20% potential increase in price ($212 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($34 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to London Heathrow.
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Price to beat on a one-way flight from Seattle/Tacoma Intl to London Heathrow.
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Find flight deals from Seattle to Heathrow

Cheapest flights from Seattle to Heathrow
Explore the most affordable flight options available from Seattle to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 16, 2025.

This CrystalTravel deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/43:45 pmSEA - LHR
1 stop12h 10mIcelandair
Sun 10/121:05 pmLHR - SEA
1 stop12h 45mIcelandair
Deal found 4/15$517
This Cheapflightsfares deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/298:20 pmSEA - LHR
Nonstop9h 20mIberia
Tue 5/209:25 amLHR - SEA
Nonstop9h 45mIberia
Deal found 4/15$592
This Flysmarter deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/286:00 amSEA - LHR
2 stops20h 00mMultiple Airlines
Tue 5/138:45 amLHR - SEA
2 stops17h 48mMultiple Airlines
Deal found 4/15$594
This Air Canada deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/215:45 amSEA - LHR
2 stops16h 45mAir Canada
Tue 10/78:45 amLHR - SEA
2 stops18h 46mAir Canada
Deal found 4/15$602
This United deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/197:05 amSEA - LHR
2 stops17h 15mUnited Airlines
Wed 9/39:00 amLHR - SEA
1 stop15h 59mUnited Airlines
Deal found 4/14$612
This Delta deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/45:35 pmSEA - LHR
Nonstop9h 45mDelta
Tue 5/139:00 amLHR - SEA
1 stop16h 25mDelta
Deal found 4/14$614
This Air France deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/308:20 pmSEA - LHR
Nonstop9h 55mAir France
Thu 5/86:15 amLHR - SEA
1 stop13h 00mAir France
Deal found 4/15$617
This KLM deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/51:30 pmSEA - LHR
1 stop12h 20mKLM
Fri 5/169:55 amLHR - SEA
1 stop14h 02mKLM
Deal found 4/16$623
This EaseMyTrip deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure EaseMyTrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/18:20 pmSEA - LHR
Nonstop9h 55mVirgin Atlantic
Mon 5/128:55 pmLHR - SEA
1 stop22h 45mVirgin Atlantic
Deal found 4/15$626
This SWISS deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/293:24 pmSEA - LHR
2 stops19h 56mSWISS
Mon 5/125:10 pmLHR - SEA
2 stops33h 23mSWISS
Deal found 4/15$630
This FlightHub deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/56:45 pmSEA - LHR
1 stop16h 10mAer Lingus
Thu 6/512:00 pmLHR - SEA
1 stop12h 59mAer Lingus
Deal found 4/15$635
This Cheapflightsfares deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/208:20 pmSEA - LHR
Nonstop9h 20mBritish Airways
Sun 10/263:00 pmLHR - SEA
Nonstop9h 55mBritish Airways
Deal found 4/15$647

Cheapflights Fare Finder

Customize your flight search to find flights from Seattle to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 16, 2025.
Use the filters below to find and compare flights from Seattle to London Heathrow Airport that are best for you.

Fly from

Seattle

Fly to

Heathrow

Route

Depart

Return

Price

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sat 10/4

3:45 pm-11:55 am

1 stop12h 10m

London Heathrow

Sun 10/12

1:05 pm-5:50 pm

1 stop12h 45m

$517

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 4/29

8:20 pm-1:40 pm

Nonstop9h 20m

London Heathrow

Tue 5/20

9:25 am-11:10 am

Nonstop9h 45m

$592

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 4/28

5:35 pm-11:20 am

Nonstop9h 45m

London Heathrow

Tue 5/13

6:15 am-11:15 am

1 stop13h 00m

$594

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 9/21

5:45 am-6:30 am

2 stops16h 45m

London Heathrow

Tue 10/7

8:45 am-7:31 pm

2 stops18h 46m

$602

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 10/8

1:45 pm-1:20 pm

1 stop15h 35m

London Heathrow

Wed 10/15

8:40 am-6:36 pm

2 stops17h 56m

$606

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 8/19

7:05 am-8:20 am

2 stops17h 15m

London Heathrow

Wed 9/3

9:00 am-4:59 pm

1 stop15h 59m

$612

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 5/4

5:35 pm-11:20 am

Nonstop9h 45m

London Heathrow

Tue 5/13

9:00 am-5:25 pm

1 stop16h 25m

$614

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 4/30

8:20 pm-2:15 pm

Nonstop9h 55m

London Heathrow

Thu 5/8

6:15 am-11:15 am

1 stop13h 00m

$617

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 5/5

1:30 pm-9:50 am

1 stop12h 20m

London Heathrow

Fri 5/16

9:55 am-3:57 pm

1 stop14h 02m

$623

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 4/29

3:24 pm-7:20 pm

2 stops19h 56m

London Heathrow

Mon 5/12

5:10 pm-6:33 pm

2 stops33h 23m

$630

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/14

Showing 1-10 of 27 results
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Compare providers for flights from Seattle to Heathrow

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 Seattle to Heathrow in April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy1 starTrust Score*2 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
oojoPrice Accuracy3 starsTrust Score*3 stars
GotogatePrice Accuracy3 starsTrust Score*2 stars
business-class.comPrice Accuracy3 starsTrust Score*2 stars
CheapOairPrice Accuracy1 starTrust Score*3 stars

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

The best insider tips for Seattle to London Heathrow Airport flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Seattle to London Heathrow Airport trip
Airports
SEA

Use SEA Spot Saver to book a security screening appointment in advance, reducing wait times for non-expedited passengers.

Read more about SEAby Brandon Schultz
LHR

Take the Heathrow Express for the fastest route to central London, reaching Paddington Station quickly.

Read more about LHRby Ramsey Qubein
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on LHR

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz

Brandon Schultz

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

Best time to book a flight from Seattle to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Seattle 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 Seattle to London Heathrow Airport

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

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Heathrow. Price data was last updated on April 11, 2025.

Booking 32 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to London Heathrow Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, November is the cheapest month in which you can book a flight from Seattle to London Heathrow Airport (average of $661). Flying from Seattle to London Heathrow Airport in June is currently the most expensive (average of $1,110). 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 SEA to LHR?

Find hourly flight availability from Seattle to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 16, 2025.

When flying from Seattle to London Heathrow Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 10% versus a flight in the morning.

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

Use this chart to determine the cheapest time to fly round-trip from Seattle to Heathrow. Price data was last updated on December 16, 2024.

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

Weekly flight availability from Seattle to London Heathrow Airport

Explore weekly flight availability from Seattle to Heathrow. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 16, 2025.

The most flights from SEA to LHR are scheduled on a Monday (22 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (16 on average).

Rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.

Temperature in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature totals by month.

If weather is an important factor for your trip to London Heathrow Airport, 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 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated April 16, 2025.
Peruse reviews from past customers who have flown with Delta, KLM and Finnair from Seattle to London to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,917 reviews

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,917 reviews
Delta
8.0
Very good
7,917 reviews

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,326 reviews
Delta
8.0
Very good
7,917 reviews

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Finnair
7.6
Good
1,269 reviews
Delta
8.0
Very good
7,917 reviews

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Austrian Airlines
7.6
Good
775 reviews
Delta
8.0
Very good
7,917 reviews

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air France
7.5
Good
1,435 reviews
Delta
8.0
Very good
7,917 reviews

Crew

8.5

Boarding

8.2

Overall

8.0

Food

7.3

Comfort

7.9

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Heathrow. 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 from for flights from Seattle to London Heathrow?

    Seattle/Tacoma Intl (SEA) is the airport you will fly out of if you book a flight from Seattle to London Heathrow. You should not have trouble finding flights to London Heathrow from Seattle/Tacoma Intl; the airport handles an average of 21 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 14 airlines have flights from the Seattle airport to London Heathrow. It is only a 11.4 mi journey to Seattle/Tacoma Intl (SEA) from Seattle’s city center.

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

    Our cheapest airline available from Seattle to London Heathrow Airport is Icelandair. Our recent data shows that you can find tickets from as low as $530 on this airline. Additional options worth looking into are Iberia and Air Canada, starting at $592 and $605 round-trip. Icelandair is currently priced 35% below the average price you’ll pay for this route.

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

    The cheapest airlines for a one-way flight from Seattle to London Heathrow Airport are Icelandair ($265), Iberia ($380), and Virgin Atlantic ($389).

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

    No one likes to see their flight delayed. When booking a flight from Seattle to London Heathrow Airport consider choosing KLM (83%), Singapore Airlines (81%) or Aeromexico (81%) as they are the most reliable in getting you off to your destination on time.

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

    Looking for the cheapest flight from Seattle to London Heathrow Airport? While on average our users pay $2,432, our data indicates the cheapest price to be $411. The most popular route (Seattle/Tacoma Intl - London Heathrow), is priced around $517.

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

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

  • How can I find direct flights from Seattle to Heathrow?

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

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

    Yes. Cheapflights offers flight deals from Seattle to Heathrow 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 Seattle to London Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from Seattle to London Heathrow Airport (average of $661). Flying from Seattle to London Heathrow Airport in June is currently the most expensive (average of $1,110). 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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Top 10 airlines flying from Seattle to Heathrow

Discover the top 10 airlines that operate flights from Seattle to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$378Average$799FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$504Average$677FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$550Average$881FlexibilityNo cancel feeOn-time69%
IberiaCheapest$581Average$734FlexibilityNo cancel feeOn-time77%
Aer LingusCheapest$583Average$816FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$597Average$762FlexibilityNo cancel feeOn-time76%
KLMCheapest$598Average$851FlexibilityNo cancel feeOn-time75%
Air FranceCheapest$615Average$909FlexibilityNo cancel feeOn-time77%
DeltaCheapest$616Average$878FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$621Average$875FlexibilityNo cancel feeOn-time70%

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