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Cheap flights from London Heathrow Airport to Seattle from C$ 749

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 15/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
21 Jan — 28 Jan1
1 adult

The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in February or April, booked 54 days in advance, depart on a Wednesday or Monday and return on a Monday

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 16 January 2025.

Round-trip from

C$ 769

One-way from

C$ 749

Popular in

July

Cheapest in

February

Average price

C$ 1,015
British Airways
  • British Airways
  • 12/2-6/3
  • Nonstop
  • 19h 20m total
  • London to Seattle
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Aer Lingus
  • Aer Lingus
  • 15/4
  • 1 total stop
  • 15h 09m total
  • London to Seattle
Search Deals
High demand for flights, 15% potential price rise
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Best time to find cheap flights, 2% potential price drop
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Average for round-trip flights in January 2025
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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 16 January 2025.

Wed 12/23:00 p.m.LHR - SEA
Nonstop9h 55mBritish Airways
Thu 6/36:50 p.m.SEA - LHR
Nonstop9h 25mBritish Airways
Deal found 15/1C$ 769
Tue 23/91:25 p.m.LHR - SEA
Nonstop10h 20mDelta
Mon 29/97:55 p.m.SEA - LHR
Nonstop9h 35mDelta
Deal found 16/1C$ 773
Fri 28/27:40 a.m.LHR - SEA
1 stop13h 40mLufthansa
Wed 12/310:35 a.m.SEA - LHR
1 stop16h 35mLufthansa
Deal found 15/1C$ 775
Mon 3/311:35 a.m.LHR - SEA
2 stops31h 37mUnited Airlines
Mon 17/35:15 a.m.SEA - LHR
1 stop21h 25mUnited Airlines
Deal found 16/1C$ 776
Wed 21/59:25 p.m.LHR - SEA
1 stop22h 00mIcelandair
Tue 3/63:45 p.m.SEA - LHR
1 stop20h 35mIcelandair
Deal found 16/1C$ 785
Sat 3/510:20 a.m.LHR - SEA
1 stop13h 40mFinnair
Tue 18/116:50 p.m.SEA - LHR
Nonstop9h 25mFinnair
Deal found 15/1C$ 795
Wed 12/21:15 p.m.LHR - SEA
Nonstop10h 00mVirgin Atlantic
Thu 6/35:45 p.m.SEA - LHR
Nonstop9h 25mVirgin Atlantic
Deal found 15/1C$ 796
Thu 23/16:30 a.m.LHR - SEA
1 stop13h 21mKLM
Wed 26/27:05 p.m.SEA - LHR
Nonstop9h 35mKLM
Deal found 15/1C$ 803
Thu 23/18:55 a.m.LHR - SEA
2 stops21h 58mSWISS
Wed 5/312:37 p.m.SEA - LHR
2 stops21h 13mSWISS
Deal found 16/1C$ 809
Wed 30/410:50 a.m.LHR - SEA
1 stop14h 09mMultiple Airlines
Wed 5/118:00 a.m.SEA - LHR
1 stop14h 40mMultiple Airlines
Deal found 14/1C$ 918

Find flights from Heathrow to Seattle within your budget

Customize 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 629,999 searches. Data last updated 16 January 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 12/2

3:00 p.m.-4:55 p.m.

Nonstop9h 55m

Seattle/Tacoma Intl

Thu 6/3

6:50 p.m.-12:15 p.m.

Nonstop9h 25m

C$ 769

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 28/2

7:40 a.m.-1:20 p.m.

1 stop13h 40m

Seattle/Tacoma Intl

Wed 12/3

10:35 a.m.-10:10 a.m.

1 stop16h 35m

C$ 775

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 3/3

11:35 a.m.-11:12 a.m.

2 stops31h 37m

Seattle/Tacoma Intl

Mon 17/3

5:15 a.m.-9:40 a.m.

1 stop21h 25m

C$ 776

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 5/3

1:15 p.m.-3:15 p.m.

Nonstop10h 00m

Seattle/Tacoma Intl

Thu 27/3

6:45 p.m.-11:10 a.m.

Nonstop9h 25m

C$ 780

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 21/5

9:25 p.m.-11:25 a.m.

1 stop22h 00m

Seattle/Tacoma Intl

Tue 3/6

3:45 p.m.-8:20 p.m.

1 stop20h 35m

C$ 785

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 3/2

1:15 p.m.-3:15 p.m.

Nonstop10h 00m

Seattle/Tacoma Intl

Mon 17/2

5:45 p.m.-11:10 a.m.

Nonstop9h 25m

C$ 792

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 3/5

10:20 a.m.-4:00 p.m.

1 stop13h 40m

Seattle/Tacoma Intl

Tue 18/11

6:50 p.m.-12:15 p.m.

Nonstop9h 25m

C$ 795

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 17/2

8:25 p.m.-11:46 a.m.

1 stop23h 21m

Seattle/Tacoma Intl

Fri 7/3

7:25 p.m.-1:10 p.m.

Nonstop9h 45m

C$ 803

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 30/4

10:50 a.m.-4:59 p.m.

1 stop14h 09m

Seattle/Tacoma Intl

Wed 5/11

8:00 a.m.-6:40 a.m.

1 stop14h 40m

C$ 918

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 2/5

8:45 a.m.-10:29 p.m.

2 stops21h 44m

Seattle/Tacoma Intl

Tue 9/12

2:00 p.m.-9:40 p.m.

2 stops23h 40m

C$ 1,023

Flights are sorted by cheapest round-trip flights first.

Deals found on 15/1

Showing 1-10 of 26 results
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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.

Travel insights for flights from Heathrow to Seattle

Get recent, data-driven insights about flights from Heathrow to Seattle including ideal travel times, pricing trends, and more.

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 round-trip flight from Heathrow to Seattle. Price data was last updated on 10 January 2025.

The price you pay for your flight from London Heathrow Airport to Seattle may vary depending on when you book. For the best chance of a lower fare, look to book 54 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 C$ 257). Flying from London Heathrow Airport to Seattle in April is currently the most expensive (average of C$ 421). 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 16 January 2025.

When flying from London Heathrow Airport to Seattle, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 27% versus a flight at noon.

Weekly flight availability from London Heathrow Airport to Seattle

Explore weekly flight availability from Heathrow to Seattle. 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 16 January 2025.

The most flights from LHR to SEA are scheduled on a Tuesday (18 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (6 on average).

Rainfall in Seattle by month

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

In terms of precipitation, rainfall in Seattle ranges from 18.0 - 168.0 mm per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit Seattle when rainfall is around 18.0 mm.

Temperature in Seattle by month

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

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 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

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 16 January 2025.
See what other customers who have flown with SWISS, Finnair and Icelandair from London to Seattle have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
8,511 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.6

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta
8.0
Very good
8,511 reviews
Delta
8.0
Very good
8,511 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.6

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

KLM
7.8
Good
1,339 reviews
Delta
8.0
Very good
8,511 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.6

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Finnair
7.6
Good
1,285 reviews
Delta
8.0
Very good
8,511 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.6

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

SWISS
7.5
Good
1,597 reviews
Delta
8.0
Very good
8,511 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.6

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Virgin Atlantic
7.5
Good
664 reviews
Delta
8.0
Very good
8,511 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Entertainment

7.9

Comfort

8.0

Crew

8.6

Reviews

1 / 10

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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?

    Seattle/Tacoma Intl (SEA), located 18.4 km from the city centre, is the airport you fly into when you book flights from London Heathrow to Seattle. 0 airlines have flights to Seattle/Tacoma Intl from London Heathrow on a regular basis. Booking flights from London Heathrow to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 12 inbound flights from London Heathrow per day.

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

    Currently priced at C$ 769, British Airways will fly you from London Heathrow Airport to Seattle and back. In addition to British Airways, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Lufthansa and United Airlines - these airlines can fly you to your destination from C$ 775 and C$ 776, respectively. These flights start at 31% lower than the current average price 3 months from now.

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

    The cheapest airlines for a one-way flight from London Heathrow Airport to Seattle are Aer Lingus (C$ 749), WestJet (C$ 785), and Finnair (C$ 832).

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

    Consider KLM (74%), Air France (74%) or Delta (74%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to Seattle.

  • 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 C$ 257). Flying from London Heathrow Airport to Seattle in April is currently the most expensive (average of C$ 421). 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 London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
SeaTac
Marysville
Tukwila
Tacoma
Bothell
Olympia
Lynnwood
Leavenworth

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Seattle from Heathrow today and book when prices fit your budget.

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