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Cheap flights from London Heathrow Airport to Seattle from £417

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 9/12. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
13 12月 — 20 12月1
1 adult
1 adult, Economy, 0 bags

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

Cheap flight deals from Heathrow to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Seattle (SEA). 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 13 11月 2025.

Round-trip from

£477

One-way from

£417

Popular in

December

Cheapest in

February

Average price

£556

Good round-trip deal

£560 or less

Good one-way deal

£490 or less
Virgin Atlantic
  • Virgin Atlantic
  • 15/1-22/1
  • Nonstop
  • 20h 18m total
  • London to Seattle
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Lufthansa
  • Lufthansa
  • 9/12
  • 2 total stops
  • 19h 36m total
  • London to Seattle
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Highest demand for flights based on searches. 4% potential increase in price (£22 potential increase over avg. return price).
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Cheapest flight prices on average. 2% potential price decrease (£13 potential savings vs. average return price).
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Average for round-trip flights in November 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

Enter your travel dates to find the best prices.

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 13 11月 2025.

週四 4/1220:35LHR - SEA
1 stop28h 25mIcelandair
週二 6/114:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 12/11£481
週六 6/1212:15LHR - SEA
1 stop12h 45mIcelandair
週二 6/114:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 12/11£481
週三 26/1112:15LHR - SEA
1 stop12h 45mIcelandair
週日 30/1114:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 11/11£482
週二 16/1220:35LHR - SEA
1 stop28h 25mIcelandair
週四 15/114:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 11/11£483
週二 16/1220:35LHR - SEA
1 stop28h 25mIcelandair
週一 5/114:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 11/11£485
週日 23/1120:35LHR - SEA
1 stop28h 25mIcelandair
週日 30/1114:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 11/11£487
週二 18/1120:35LHR - SEA
1 stop28h 25mIcelandair
週三 31/1214:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 12/11£497
週二 16/1220:35LHR - SEA
1 stop28h 25mIcelandair
週三 31/1214:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 11/11£498

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to Seattle 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 858,174 searches. Data last updated 13 11月 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Seattle that are best for you.

Fly from

Heathrow

Fly to

Seattle

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

週三 10/12

12:15-17:00

1 stop12h 45m

Seattle/Tacoma Intl

週四 8/1

14:35-10:50

1 stop12h 15m

£481

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

週二 16/12

20:35-17:00

1 stop28h 25m

Seattle/Tacoma Intl

週三 14/1

14:35-10:50

1 stop12h 15m

£482

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

週二 16/12

20:35-17:00

1 stop28h 25m

Seattle/Tacoma Intl

週四 15/1

14:35-19:30

1 stop20h 55m

£484

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

週五 13/2

14:55-16:55

Nonstop10h 00m

Seattle/Tacoma Intl

週四 19/2

13:39-11:35

1 stop13h 56m

£497

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

週五 13/2

14:55-16:55

Nonstop10h 00m

Seattle/Tacoma Intl

週四 19/2

18:50-12:20

Nonstop9h 30m

£503

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

週四 11/12

10:05-00:55

1 stop22h 50m

Seattle/Tacoma Intl

週四 8/1

18:50-12:20

Nonstop9h 30m

£525

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

週一 8/12

12:35-23:25

1 stop18h 50m

Seattle/Tacoma Intl

週四 8/1

18:50-12:20

Nonstop9h 30m

£525

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

週二 3/3

06:30-12:10

1 stop13h 40m

Seattle/Tacoma Intl

週二 10/3

08:30-09:10

2 stops17h 40m

£530

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

週六 7/2

14:55-16:55

Nonstop10h 00m

£421

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

週四 12/2

14:55-16:55

Nonstop10h 00m

£421

Flights are sorted by cheapest return flights first.

Deals found on 11/11

Showing 1-10 of 20 results
1
2

Best time to book a flight from Heathrow to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Heathrow with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

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

Use this chart to determine the optimal time to book a return flight from Heathrow to Seattle. Price data was last updated on 7 November 2025.

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 £385). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £520). 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?

Find hourly flight availability from Heathrow to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 13 11月 2025.

It’s typically best to fly out from London Heathrow Airport to Seattle in the evening. Doing so could potentially save you 17% on the flight price compared to flying in the morning, which is usually more expensive.

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

Use this chart to determine the cheapest time to fly return from Heathrow to Seattle. Price data was last updated on 2 November 2025.

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

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

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated 13 11月 2025.
See what other customers who have flown with KLM, Virgin Atlantic, andAir France from London Heathrow Airport to Seattle have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,410 reviews
Check prices

Crew

8.4

Boarding

7.8

Overall

7.7

Food

7.3

Entertainment

7.1

Comfort

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
KLM
7.7
Good
1,410 reviews
KLM
7.7
Good
1,410 reviews
Check prices

Crew

8.4

Boarding

7.8

Overall

7.7

Food

7.3

Entertainment

7.1

Comfort

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Virgin Atlantic
7.5
Good
673 reviews
KLM
7.7
Good
1,410 reviews
Check prices

Crew

8.4

Boarding

7.8

Overall

7.7

Food

7.3

Entertainment

7.1

Comfort

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Air France
7.4
Good
1,486 reviews
KLM
7.7
Good
1,410 reviews
Check prices

Crew

8.4

Boarding

7.8

Overall

7.7

Food

7.3

Entertainment

7.1

Comfort

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Icelandair
7.1
Good
578 reviews
KLM
7.7
Good
1,410 reviews
Check prices

Crew

8.4

Boarding

7.8

Overall

7.7

Food

7.3

Entertainment

7.1

Comfort

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
British Airways
6.7
Okay
7,516 reviews
KLM
7.7
Good
1,410 reviews
Check prices

Crew

8.4

Boarding

7.8

Overall

7.7

Food

7.3

Entertainment

7.1

Comfort

7.7

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

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?

    If you book a flight to Seattle from London Heathrow, you will be flying to Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 15 flights from London Heathrow to Seattle/Tacoma Intl per day from 14 different airlines.

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

    Departing from London Heathrow Airport to Seattle will take you 12h 45m. The distance from London Heathrow Airport to Seattle is about 4783 mi.

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

    According to our current data, Icelandair (£364), Air France (£394), and Finnair (£407) offers the cheapest pricing from London Heathrow Airport to Seattle. Icelandair is priced at 38% lower than the current average price of a flight leaving 3 months from now.

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

    Consider Scandinavian Airlines (97%), Air France (89%) or KLM (88%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Seattle.

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

    The cheapest flight price from London Heathrow Airport to Seattle is £422. On average you can expect to pay £1,559. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for £375.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Heathrow to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of £385). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £520). 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

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Leavenworth
Bothell
SeaTac

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Fly from Heathrow to Seattle on these airlines

Choose from the following airlines for your flight from Heathrow to Seattle. Flights are based on user searches made on Cheapflights and were last updated on 13 11月 2025.
Virgin Atlantic flights from London Heathrow to Seattle/Tacoma Intl
British Airways flights from London Heathrow to Seattle/Tacoma Intl
Finnair flights from London Heathrow to Seattle/Tacoma Intl

Top 10 airlines flying from Heathrow to Seattle

Discover the top 10 airlines that operate flights from Heathrow to Seattle. 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 858,174 searches. Data last updated 13 11月 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£364Average£486FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£394Average£612FlexibilityNo cancel feeOn-time77%
Search Air France flights
FinnairCheapest£407Average£577FlexibilityNo cancel feeOn-time76%
Search Finnair flights
LufthansaCheapest£408Average£505FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
KLMCheapest£412Average£582FlexibilityNo cancel feeOn-time75%
Search KLM flights
United AirlinesCheapest£414Average£655FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£450Average£616FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£452Average£599FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapest£455Average£609FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Aer LingusCheapest£467Average£679FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Heathrow to Seattle?

Deals for Heathrow to Seattle flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Heathrow to Seattle?

Cheapflights helps you find that perfect flight to Seattle from Heathrow by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Heathrow to Seattle with no change fees?

Need flexible booking options for your flight to Seattle from Heathrow? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Heathrow to Seattle become cheaper?

Yes! Start tracking prices for Heathrow to Seattle flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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