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Cheap flights from London Heathrow Airport to Seattle from £255

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 10/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — SEA
20 Nov — 27 Nov1
1 adult

The best prices from London Heathrow to Seattle/Tacoma Intl are usually found in January or April, booked 48 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

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 15 November 2024.

Round-trip from

£438

One-way from

£255

Popular in

July

Cheapest in

January
Icelandair
  • Icelandair
  • 5/2-27/2
  • 2 total stops
  • 49h 15m total
  • London to Seattle
Search Deals
10/2
  • 10/2
  • 2 total stops
  • 55h 06m total
  • London to Seattle
Search Deals
High demand for flights, 23% potential price rise
Search Deals
Best time to find cheap flights, 12% potential price drop
Search Deals

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 15 November 2024.

Thu 5/1220:40LHR - SEA
1 stop28h 20mIcelandair
Mon 9/1214:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 14/11£487
Sat 23/1113:45LHR - SEA
1 stop37h 28mUnited Airlines
Mon 25/1106:05SEA - LHR
1 stop21h 45mUnited Airlines
Deal found 15/11£498
Wed 4/1206:30LHR - SEA
1 stop13h 40mMultiple Airlines
Wed 12/310:55SEA - LHR
1 stop14h 00mMultiple Airlines
Deal found 15/11£529
Mon 9/1211:10LHR - SEA
1 stop34h 10mLufthansa
Tue 24/1210:35SEA - LHR
1 stop15h 35mLufthansa
Deal found 15/11£532
Tue 10/1213:15LHR - SEA
Nonstop10h 00mVirgin Atlantic
Tue 17/1209:30SEA - LHR
1 stop16h 30mVirgin Atlantic
Deal found 14/11£543
Wed 4/1206:20LHR - SEA
1 stop13h 49mDelta
Wed 12/318:45SEA - LHR
Nonstop9h 25mDelta
Deal found 14/11£550
Tue 10/1213:15LHR - SEA
Nonstop10h 00mKLM
Tue 17/1209:30SEA - LHR
1 stop16h 30mKLM
Deal found 15/11£552
Mon 9/1215:00LHR - SEA
Nonstop9h 55mIberia
Tue 24/1213:35SEA - LHR
Nonstop9h 25mIberia
Deal found 15/11£572
Mon 9/1215:00LHR - SEA
Nonstop9h 55mAmerican Airlines
Tue 24/1213:35SEA - LHR
Nonstop9h 25mAmerican Airlines
Deal found 14/11£573
Thu 5/1213:25LHR - SEA
2 stops16h 35mAir Canada
Mon 9/1206:05SEA - LHR
2 stops17h 05mAir Canada
Deal found 14/11£577
Tue 10/1220:45LHR - SEA
1 stop29h 30mAer Lingus
Mon 16/1200:15SEA - LHR
2 stops23h 50mAer Lingus
Deal found 14/11£591
Thu 28/1115:00LHR - SEA
Nonstop9h 55mFinnair
Thu 5/1207:20SEA - LHR
1 stop15h 00mFinnair
Deal found 14/11£603

Find flights from Heathrow to Seattle within your budget

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 943,810 searches. Data last updated 15 November 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 6/2

08:25-14:09

1 stop37h 44m

Seattle/Tacoma Intl

Thu 20/2

23:17-05:55

1 stop22h 38m

£485

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 25/2

13:15-15:15

Nonstop10h 00m

Seattle/Tacoma Intl

Tue 4/3

17:45-11:10

Nonstop9h 25m

£488

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 7/5

10:20-16:00

1 stop13h 40m

Seattle/Tacoma Intl

Sat 17/5

17:40-12:10

1 stop34h 30m

£494

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 7/5

09:30-16:00

1 stop14h 30m

Seattle/Tacoma Intl

Sat 17/5

17:40-15:10

1 stop13h 30m

£508

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 15/1

06:30-11:50

1 stop13h 20m

Seattle/Tacoma Intl

Tue 21/1

17:45-11:10

Nonstop9h 25m

£518

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 13/1

13:00-22:00

1 stop17h 00m

Seattle/Tacoma Intl

Sun 26/1

23:59-05:55

2 stops21h 56m

£519

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 4/12

06:30-12:10

1 stop13h 40m

Seattle/Tacoma Intl

Wed 12/3

10:55-07:55

1 stop14h 00m

£529

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 18/2

06:30-11:45

1 stop13h 15m

Seattle/Tacoma Intl

Mon 24/2

17:45-11:10

Nonstop9h 25m

£532

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 6/5

14:10-18:27

1 stop12h 17m

Seattle/Tacoma Intl

Tue 20/5

09:00-07:25

1 stop14h 25m

£537

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 24/3

15:00-17:55

Nonstop9h 55m

Seattle/Tacoma Intl

Wed 14/5

19:40-13:00

Nonstop9h 20m

£554

Flights are sorted by cheapest first

Deals found on 14/11

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 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.

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 return flight from Heathrow to Seattle. Price data was last updated on 8 November 2024.

The best time to book flights from London Heathrow Airport to Seattle is 48 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 £616). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £841). 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 15 November 2024.

It’s typically best to fly out from London Heathrow Airport to Seattle in the evening. Doing so could potentially save you 12% on the flight price compared to flying in the afternoon, 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 10 November 2024.

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 afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 15 November 2024.

The most flights from LHR to SEA are scheduled on a Friday (22 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (10 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 inches 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 15 November 2024.
Get a feel of what it's like to fly with Icelandair, Virgin Atlantic and Finnair from London to Seattle by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
8,786 reviews
Check prices

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

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
8,786 reviews
Delta
8.0
Very Good
8,786 reviews
Check prices

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

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
1,350 reviews
Delta
8.0
Very Good
8,786 reviews
Check prices

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

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
1,304 reviews
Delta
8.0
Very Good
8,786 reviews
Check prices

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

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
810 reviews
Delta
8.0
Very Good
8,786 reviews
Check prices

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 10

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

Virgin Atlantic
7.6
Good
662 reviews
Delta
8.0
Very Good
8,786 reviews
Check prices

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

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?

    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 14 flights from London Heathrow to Seattle/Tacoma Intl per day from 12 different airlines.

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

    According to our current data, Icelandair (£438), Virgin Atlantic (£488), and Finnair (£494) offers the cheapest pricing from London Heathrow Airport to Seattle. Icelandair is priced at 26% lower than the current average price of a flight leaving 3 months from now.

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

    The cheapest airline one-way is WestJet, with whom users have recently found tickets for as low as £284. However, be on the lookout for offers from Icelandair and Aer Lingus, as they are both options that can get you from London Heathrow Airport to Seattle for a low price.

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

    Consider Air France (69%), Delta (69%) or Virgin Atlantic (69%) 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 £525. On average you can expect to pay £2,000. The most popular route, (London Heathrow - Seattle/Tacoma Intl), can usually be booked for £427.

  • 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 £616). Flying from London Heathrow Airport to Seattle in July is currently the most expensive (average of £841). 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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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 15 November 2024.
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 943,810 searches. Data last updated 15 November 2024.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£8Average£686FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
DeltaCheapest£318Average£592FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
LufthansaCheapest£406Average£571FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£409Average£548FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
United AirlinesCheapest£419Average£639FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest£435Average£558FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
British AirwaysCheapest£438Average£613FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£443Average£613FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
FinnairCheapest£449Average£603FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Air FranceCheapest£471Average£622FlexibilityNo cancel feeOn-time77%
Search Air France 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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