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Cheap flights from London to Seattle from £411

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 31/1. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
28 Jan — 4 Feb1
1 adult

The best prices from London to Seattle/Tacoma Intl are usually found in February or January, booked 69 days in advance, depart on a Tuesday or Wednesday and return on a Monday

Cheap flight deals from London to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) 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 23 January 2025.

Round-trip from

£429

One-way from

£411

Popular in

August

Cheapest in

February

Average price

£516

Good round-trip deal

£494 or less

Good one-way deal

£568 or less
Delta
  • Delta
  • 18/2-27/2
  • 1 total stop
  • 22h 41m total
  • London to Seattle
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31/1
  • 31/1
  • 3 total stops
  • 27h 00m total
  • London to Seattle
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£93 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£16 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 2025
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Price to beat on a round-trip flight from London (LON) to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from London (LON) to Seattle/Tacoma Intl.
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Find flight deals from London to Seattle

Cheapest flights from London to Seattle
Explore the most affordable flight options available from London to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 23 January 2025.

Tue 18/206:30LHR - SEA
1 stop13h 16mDelta
Thu 27/217:45SEA - LHR
Nonstop9h 25mDelta
Deal found 22/1£429
Mon 3/206:00LHR - SEA
2 stops23h 20mSWISS
Tue 1/415:24SEA - LHR
2 stops19h 56mSWISS
Deal found 22/1£430
Thu 13/306:30LHR - SEA
2 stops18h 55mMultiple Airlines
Mon 24/305:45SEA - LHR
2 stops18h 25mMultiple Airlines
Deal found 22/1£431
Tue 28/115:00LHR - SEA
2 stops31h 30mAir Canada
Tue 4/205:45SEA - LHR
2 stops17h 25mAir Canada
Deal found 22/1£432
Wed 19/215:50LHR - SEA
Nonstop10h 21mKLM
Wed 26/219:05SEA - LHR
Nonstop9h 35mKLM
Deal found 22/1£435
Tue 11/209:15LCY - SEA
2 stops21h 38mSWISS
Thu 27/215:24SEA - LCY
2 stops17h 41mSWISS
Deal found 22/1£439
Thu 6/318:40LGW - SEA
2 stops34h 35mSWISS
Thu 13/314:50SEA - LGW
2 stops20h 00mSWISS
Deal found 21/1£441
Mon 3/311:35LHR - SEA
2 stops31h 37mUnited Airlines
Mon 17/308:50SEA - LHR
1 stop17h 50mUnited Airlines
Deal found 22/1£441
Thu 12/615:40LGW - SEA
1 stop13h 00mIcelandair
Tue 1/723:30SEA - LGW
1 stop31h 10mIcelandair
Deal found 22/1£442
Wed 29/115:00LHR - SEA
Nonstop9h 55mIberia
Sun 2/200:45SEA - LHR
1 stop22h 35mIberia
Deal found 22/1£445
Tue 28/111:15LHR - SEA
1 stop19h 28mAmerican Airlines
Tue 4/213:35SEA - LHR
Nonstop9h 25mAmerican Airlines
Deal found 22/1£448
Tue 1/406:30LHR - SEA
1 stop13h 55mLufthansa
Tue 29/414:18SEA - LHR
1 stop13h 27mLufthansa
Deal found 22/1£451

Find flights from London to Seattle within your budget

Customise your flight search to find flights from London 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 23 January 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 18/2

06:30-11:46

1 stop13h 16m

Seattle/Tacoma Intl

Mon 24/2

17:45-11:10

Nonstop9h 25m

£429

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 3/2

06:00-21:20

2 stops23h 20m

Seattle/Tacoma Intl

Tue 1/4

15:24-19:20

2 stops19h 56m

£430

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 13/3

06:30-18:25

2 stops18h 55m

Seattle/Tacoma Intl

Mon 24/3

05:45-07:10

2 stops18h 25m

£431

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 3/2

13:15-15:15

Nonstop10h 00m

Seattle/Tacoma Intl

Sun 9/2

22:55-06:25

1 stop23h 30m

£432

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 19/2

15:50-18:11

Nonstop10h 21m

Seattle/Tacoma Intl

Wed 26/2

19:05-12:40

Nonstop9h 35m

£435

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 7/2

07:40-13:20

1 stop13h 40m

Seattle/Tacoma Intl

Wed 12/2

10:35-10:10

1 stop15h 35m

£439

LondonSeattle

LCY - SEA

LCYSEA

London City

Tue 11/2

09:15-22:53

2 stops21h 38m

Seattle/Tacoma Intl

Thu 27/2

15:24-17:05

2 stops17h 41m

£439

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Thu 6/3

18:40-21:15

2 stops34h 35m

Seattle/Tacoma Intl

Thu 13/3

14:50-17:50

2 stops20h 00m

£441

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Thu 12/6

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Tue 1/7

23:30-14:40

1 stop31h 10m

£442

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 1/4

06:30-12:25

1 stop13h 55m

Seattle/Tacoma Intl

Tue 29/4

14:18-11:45

1 stop13h 27m

£451

Flights are sorted by cheapest return flights first.

Deals found on 22/1

Showing 1-10 of 60 results
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Best time to book a flight from London to Seattle

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

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

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

Use this chart to determine the optimal time to book a return flight from London to Seattle. Price data was last updated on 17 January 2025.

Booking 69 days in advance of your planned departure date is, on average, the best time to get cheap flights from London to Seattle. 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 London to Seattle?

Currently, January is the cheapest month in which you can book a flight from London to Seattle (average of £622). Flying from London to Seattle in July is currently the most expensive (average of £946). 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 LON to SEA?

Find hourly flight availability from London 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 23 January 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 21% on flights from London to Seattle by exploring options for tickets in the evening.

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

Use this chart to determine the cheapest time to fly return from London to Seattle. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their London 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.

Weekly flight availability from London to Seattle

Explore weekly flight availability from London 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 23 January 2025.

The most flights from LON to SEA are scheduled on a Tuesday (17 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 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 23 January 2025.
Read through reviews of airlines operating flights from London to Seattle, such as Iberia, SWISS and Virgin Atlantic. 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
8,514 reviews
Check prices

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.6

Comfort

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
8,514 reviews
Delta
8.0
Very Good
8,514 reviews
Check prices

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.6

Comfort

8.0

Reviews

1 / 10

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

Air New Zealand
7.9
Good
482 reviews
Delta
8.0
Very Good
8,514 reviews
Check prices

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.6

Comfort

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
1,338 reviews
Delta
8.0
Very Good
8,514 reviews
Check prices

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.6

Comfort

8.0

Reviews

1 / 10

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

Finnair
7.6
Good
1,286 reviews
Delta
8.0
Very Good
8,514 reviews
Check prices

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.6

Comfort

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
7.5
Good
787 reviews
Delta
8.0
Very Good
8,514 reviews
Check prices

Overall

8.0

Food

7.3

Entertainment

7.9

Boarding

8.2

Crew

8.6

Comfort

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 London 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?

    Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Seattle from London. Booking flights from London to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 12 daily inbound flights from London from 12 different airlines.

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

    Delta, at £429, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include SWISS and Virgin Atlantic. Delta is priced at 30% lower than the current average price of a flight leaving 3 months from now.

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

    £418 is the cheapest one-way deal found within the past few days, from Aer Lingus. You may also be able to find cheap deals on Icelandair and British Airways, with prices starting from £421 and £435, respectively.

  • What are the most popular routes from London to Seattle?

    When deciding which route to take from London to Seattle consider London Heathrow - Seattle/Tacoma Intl, London Gatwick - Seattle/Tacoma Intl or London City - Seattle/Tacoma Intl as they are the most popular.

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

    Consider KLM (75%), Air France (75%) or Delta (75%) when booking your flight. These represent the most reliable airlines when flying from London to Seattle.

  • What are the cheapest flights from London to Seattle?

    On average you can expect to pay £1,272 for a flight from London to Seattle. The cheapest flight overall is £425 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £362.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from London 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 to Seattle?

    Currently, January is the cheapest month in which you can book a flight from London to Seattle (average of £622). Flying from London to Seattle in July is currently the most expensive (average of £946). 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?

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

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Fly from London to Seattle on these airlines

Choose from the following airlines for your flight from London to Seattle. Flights are based on user searches made on Cheapflights and were last updated on 23 January 2025.
Virgin Atlantic flights from London to Seattle/Tacoma Intl
British Airways flights from London to Seattle/Tacoma Intl
Finnair flights from London to Seattle/Tacoma Intl

Top 10 airlines flying from London to Seattle

Discover the top 10 airlines that operate flights from London 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 23 January 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£321Average£669FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
IcelandairCheapest£354Average£566FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£422Average£628FlexibilityNo cancel feeOn-time77%
Search Air France flights
United AirlinesCheapest£434Average£683FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
LufthansaCheapest£434Average£576FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Aer LingusCheapest£449Average£706FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Air CanadaCheapest£454Average£605FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
British AirwaysCheapest£464Average£613FlexibilityNo cancel feeOn-time70%
Search British Airways flights
FinnairCheapest£466Average£633FlexibilityNo cancel feeOn-time76%
Search Finnair flights
KLMCheapest£469Average£660FlexibilityNo cancel feeOn-time75%
Search KLM 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 London to Seattle?

Cheapflights makes it easy to find London to Seattle flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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

Millions of users choose and trust Cheapflights to book the best flight deals from London to Seattle for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Certainly. Search results for flights to Seattle from London shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, Cheapflights offers price alerts on London to Seattle flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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