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Cheap flights from London Heathrow Airport to Seattle from C$ 757

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 19/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
22 Dec — 29 Dec1
1 adult

The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in April or January, 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 17 December 2024.

Round-trip from

C$ 944

One-way from

C$ 757

Popular in

July

Cheapest in

April

Average price

C$ 1,215
SWISS
  • SWISS
  • 27/1-11/2
  • 4 total stops
  • 40h 23m total
  • London to Seattle
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WestJet
  • WestJet
  • 19/1
  • 1 total stop
  • 31h 31m 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
Search Deals
Average for round-trip flights in December 2024
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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 17 December 2024.

Tue 31/129:10 a.m.LHR - SEA
1 stop33h 35mDelta
Fri 31/17:32 p.m.SEA - LHR
Nonstop9h 38mDelta
Deal found 17/12C$ 1,119
Tue 31/127:30 a.m.LHR - SEA
2 stops34h 23mUnited Airlines
Fri 31/111:05 a.m.SEA - LHR
2 stops16h 00mUnited Airlines
Deal found 16/12C$ 1,288
Tue 24/121:15 p.m.LHR - SEA
Nonstop10h 00mVirgin Atlantic
Tue 7/15:45 p.m.SEA - LHR
Nonstop9h 25mVirgin Atlantic
Deal found 17/12C$ 1,349
Mon 30/124:20 p.m.LHR - SEA
2 stops39h 11mBritish Airways
Mon 6/110:26 a.m.SEA - LHR
1 stop35h 54mBritish Airways
Deal found 16/12C$ 1,375
Mon 30/121:15 p.m.LHR - SEA
Nonstop10h 00mAir France
Sat 15/36:45 p.m.SEA - LHR
Nonstop9h 25mAir France
Deal found 17/12C$ 1,392
Tue 24/127:40 a.m.LHR - SEA
1 stop13h 40mLufthansa
Tue 31/1210:35 a.m.SEA - LHR
1 stop15h 35mLufthansa
Deal found 16/12C$ 1,393
Fri 27/129:25 a.m.LHR - SEA
Nonstop9h 55mFinnair
Tue 31/126:50 p.m.SEA - LHR
Nonstop9h 25mFinnair
Deal found 17/12C$ 1,536
Tue 24/126:00 a.m.LHR - SEA
2 stops23h 15mSWISS
Tue 31/1210:56 a.m.SEA - LHR
2 stops37h 09mSWISS
Deal found 16/12C$ 1,706
Wed 18/127:30 p.m.LHR - SEA
2 stops34h 21mScandinavian Airlines
Wed 15/111:45 a.m.SEA - LHR
2 stops21h 55mScandinavian Airlines
Deal found 16/12C$ 1,864
Wed 25/1212:15 p.m.LHR - SEA
1 stop12h 45mIcelandair
Sat 28/122:35 p.m.SEA - LHR
1 stop20h 55mIcelandair
Deal found 17/12C$ 1,946
Sun 29/123:50 p.m.LHR - SEA
Nonstop10h 40mKLM
Sun 5/17:04 p.m.SEA - LHR
Nonstop9h 36mKLM
Deal found 17/12C$ 2,037
Mon 23/121:00 p.m.LHR - SEA
1 stop13h 25mMultiple Airlines
Tue 31/1210:56 a.m.SEA - LHR
1 stop12h 59mMultiple Airlines
Deal found 17/12C$ 2,163

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 17 December 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 27/1

8:55 a.m.-10:53 p.m.

2 stops21h 58m

Seattle/Tacoma Intl

Tue 11/2

3:25 p.m.-5:50 p.m.

2 stops18h 25m

C$ 944

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 17/2

6:30 a.m.-12:10 p.m.

1 stop13h 40m

Seattle/Tacoma Intl

Tue 4/3

10:52 a.m.-7:55 a.m.

1 stop13h 03m

C$ 945

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 14/1

6:35 a.m.-1:20 p.m.

1 stop14h 45m

Seattle/Tacoma Intl

Tue 21/1

7:00 a.m.-9:10 a.m.

2 stops18h 10m

C$ 946

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 23/4

1:05 p.m.-8:40 p.m.

1 stop15h 35m

Seattle/Tacoma Intl

Thu 15/5

7:00 p.m.-8:20 p.m.

1 stop17h 20m

C$ 948

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 27/1

6:30 a.m.-11:51 a.m.

1 stop13h 21m

Seattle/Tacoma Intl

Tue 11/2

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

Nonstop9h 25m

C$ 961

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 27/1

6:20 a.m.-12:14 p.m.

1 stop13h 54m

Seattle/Tacoma Intl

Tue 11/2

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

Nonstop9h 25m

C$ 966

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 27/1

6:30 a.m.-9:21 p.m.

2 stops22h 51m

Seattle/Tacoma Intl

Thu 6/2

10:33 a.m.-8:15 a.m.

1 stop13h 42m

C$ 974

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 18/2

9:25 a.m.-11:20 a.m.

Nonstop9h 55m

Seattle/Tacoma Intl

Thu 27/2

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

Nonstop9h 25m

C$ 988

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 21/2

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

1 stop13h 40m

Seattle/Tacoma Intl

Thu 27/2

10:52 a.m.-7:55 a.m.

1 stop13h 03m

C$ 998

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 17/1

9:05 a.m.-8:31 p.m.

2 stops43h 26m

Seattle/Tacoma Intl

Sun 26/1

7:00 a.m.-9:40 a.m.

2 stops42h 40m

C$ 1,018

Flights are sorted by cheapest round-trip flights first.

Deals found on 17/12

Showing 1-10 of 27 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 13 December 2024.

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, August is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of C$ 270). Flying from London Heathrow Airport to Seattle in March is currently the most expensive (average of C$ 437). 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 17 December 2024.

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 17 December 2024.

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 17 December 2024.
See what other customers who have flown with Icelandair, Lufthansa and British Airways 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
8,615 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Crew

8.6

Boarding

8.2

Food

7.3

Overall

8.0

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
8,615 reviews
Delta
8.0
Very good
8,615 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Crew

8.6

Boarding

8.2

Food

7.3

Overall

8.0

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
1,351 reviews
Delta
8.0
Very good
8,615 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Crew

8.6

Boarding

8.2

Food

7.3

Overall

8.0

Reviews

1 / 10

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

Finnair
7.7
Good
1,287 reviews
Delta
8.0
Very good
8,615 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Crew

8.6

Boarding

8.2

Food

7.3

Overall

8.0

Reviews

1 / 10

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

SWISS
7.6
Good
1,607 reviews
Delta
8.0
Very good
8,615 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Crew

8.6

Boarding

8.2

Food

7.3

Overall

8.0

Reviews

1 / 10

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

Austrian Airlines
7.6
Good
788 reviews
Delta
8.0
Very good
8,615 reviews
Check prices

Entertainment

7.9

Comfort

7.9

Crew

8.6

Boarding

8.2

Food

7.3

Overall

8.0

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 10 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$ 944, SWISS will fly you from London Heathrow Airport to Seattle and back. In addition to SWISS, 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$ 945 and C$ 946, respectively. These flights start at 14% 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 WestJet (C$ 757), Icelandair (C$ 925), and JetBlue (C$ 1,123).

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

    Consider Air France (73%), Delta (73%) or Virgin Atlantic (73%) 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, August is the cheapest month in which you can book a flight from London Heathrow Airport to Seattle (average of C$ 270). Flying from London Heathrow Airport to Seattle in March is currently the most expensive (average of C$ 437). 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.

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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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