Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from London to Seattle from £410

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 11/1. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
2 Jan — 9 Jan1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from London to Seattle/Tacoma Intl are usually found in January or February, booked 90 days in advance, depart on a Wednesday or Thursday and return on a Tuesday

Cheap flight deals from London to Seattle

Enter your travel dates to find the best prices.

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 3 December 2025.

Tue 9/1215:00LHR - SEA
2 stops15h 46mAir Canada
Tue 23/1215:40SEA - LHR
2 stops33h 40mAir Canada
Deal found 1/12£480
Wed 17/1213:20LHR - SEA
1 stop16h 53mDelta
Wed 18/206:05SEA - LHR
1 stop16h 20mDelta
Deal found 1/12£482
Tue 9/1220:45LHR - SEA
1 stop29h 35mBritish Airways
Sun 21/1220:05SEA - LHR
1 stop15h 45mBritish Airways
Deal found 1/12£482
Tue 16/1211:20LHR - SEA
1 stop17h 30mDelta
Wed 14/116:45SEA - LHR
Nonstop9h 45mDelta
Deal found 2/12£483
Mon 8/1214:30LHR - SEA
1 stop12h 46mAir Canada
Fri 26/1205:50SEA - LHR
1 stop22h 00mAir Canada
Deal found 1/12£484
Sat 27/1215:05LHR - SEA
Nonstop10h 05mVirgin Atlantic
Sat 10/118:25SEA - LHR
Nonstop9h 30mVirgin Atlantic
Deal found 2/12£485
Wed 17/1213:20LHR - SEA
1 stop16h 53mDelta
Mon 16/218:25SEA - LHR
Nonstop9h 30mDelta
Deal found 1/12£485
Thu 11/1214:30LHR - SEA
2 stops18h 20mMultiple Airlines
Thu 25/1205:50SEA - LHR
2 stops17h 20mMultiple Airlines
Deal found 1/12£486
Tue 16/1216:20LHR - SEA
2 stops38h 08mAustrian Airlines
Mon 5/110:52SEA - LHR
1 stop35h 03mAustrian Airlines
Deal found 1/12£487
Wed 17/1215:20LHR - SEA
2 stops17h 30mUnited Airlines
Wed 18/207:00SEA - LHR
2 stops17h 25mUnited Airlines
Deal found 1/12£488
Wed 17/1213:20LHR - SEA
1 stop16h 53mDelta
Tue 17/211:20SEA - LHR
1 stop14h 40mDelta
Deal found 1/12£488
Sun 14/1214:30LHR - SEA
1 stop12h 46mUnited Airlines
Sun 28/1205:50SEA - LHR
1 stop22h 00mUnited Airlines
Deal found 2/12£489

Find 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 3 December 2025.

Round-trip from

£478

One-way from

£410

Popular in

July

Cheapest in

January

Average price

£647

Good round-trip deal

£534 or less

Good one-way deal

£449 or less
British Airways
  • British Airways
  • 11/3-18/3
  • 3 total stops
  • 34h 15m total
  • London to Seattle
Search Deals
Air Canada
  • Air Canada
  • 11/1
  • 1 total stop
  • 19h 06m total
  • London to Seattle
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£58 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£10 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from London (LON) to Seattle/Tacoma Intl.
Search Deals
Price to beat on a one-way flight from London (LON) to Seattle/Tacoma Intl.
Search Deals

Cheapflights Fare Finder

 
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 3 December 2025.
Use the filters below to find and compare flights from London to Seattle that are best for you.

Fly from

London

Fly to

Seattle

Route

Depart

Return

Price

LondonSeattle

LCY - SEA

LCYSEA

London City

Fri 6/3

18:15-12:10

1 stop25h 55m

Seattle/Tacoma Intl

Tue 10/3

15:00-17:35

1 stop19h 35m

£482

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 19/5

10:00-14:18

2 stops36h 18m

Seattle/Tacoma Intl

Fri 5/6

08:20-10:00

1 stop17h 40m

£485

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 12/1

06:00-22:43

2 stops24h 43m

Seattle/Tacoma Intl

Mon 26/1

10:58-16:20

2 stops21h 22m

£486

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 19/2

06:30-11:40

1 stop13h 10m

Seattle/Tacoma Intl

Sat 28/2

18:25-11:55

Nonstop9h 30m

£487

LondonSeattle

LCY - SEA

LCYSEA

London City

Thu 15/1

17:05-11:50

1 stop26h 45m

Seattle/Tacoma Intl

Thu 22/1

06:05-08:10

2 stops18h 05m

£491

LondonSeattle

LCY - SEA

LCYSEA

London City

Fri 6/3

09:20-11:35

1 stop34h 15m

Seattle/Tacoma Intl

Tue 10/3

07:20-08:10

2 stops41h 50m

£491

LondonSeattle

LCY - SEA

LCYSEA

London City

Tue 10/3

18:55-12:35

1 stop24h 40m

Seattle/Tacoma Intl

Sun 15/3

16:00-17:20

1 stop18h 20m

£491

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 12/4

06:30-18:40

2 stops20h 10m

Seattle/Tacoma Intl

Sun 19/4

21:55-08:50

1 stop26h 55m

£491

LondonSeattle

LCY - SEA

LCYSEA

London City

Thu 15/1

20:05-11:50

1 stop23h 45m

Seattle/Tacoma Intl

Tue 27/1

07:10-07:15

2 stops16h 05m

£491

LondonSeattle

LCY - SEA

LCYSEA

London City

Thu 29/1

10:00-11:50

1 stop33h 50m

Seattle/Tacoma Intl

Sun 1/2

23:10-09:30

2 stops26h 20m

£491

Flights are sorted by cheapest return flights first.

Deals found on 2/12

Showing 1-10 of 60 results
1
2
3
...
6

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.

Cheapflights Insights

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

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 28 November 2025.

Booking 90 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, March is the cheapest month in which you can book a flight from London to Seattle (average of £309). Flying from London to Seattle in August is currently the most expensive (average of £467). 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 3 December 2025.

Unlike in the evening, 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 morning.

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 Wednesday mornings 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 3 December 2025.

The most flights from LON to SEA are scheduled on a Saturday (26 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (11 on average).

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

What’s the top stopover airport for flights from London to Seattle?

Share of one-stop return flights from London to Seattle chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Reykjavik (KEF) – chosen by Cheapflights users on 76% of one-stop itineraries from London to Seattle on Cheapflights.

What’s the cheapest stopover airport for flights from London to Seattle?

Average return fare for one-stop flights from London to Seattle, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Calgary (YYC) is the most affordable one-stop option, with an average return flight price of £396.

What’s the fastest stopover option from London to Seattle?

Shortest average travel time for one-stop one-way flights from London to Seattle, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Paris (CDG) have the shortest average one-way travel time for one-stop routes: 13h 00m.

Which airport typically offers the quickest stopover for flights from London to Seattle?

Average stopover duration for one-stop one-way flights from London to Seattle, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Salt Lake City (SLC) offer the fastest connection on this route, with an average stopover time of 0h 52m.

How often are flights from London to Seattle delayed?

About 13% of weekly flights between London and Seattle have experienced delays in the past year, with the average delay time being 117 minutes.

What is the most punctual flight time for London to Seattle flights?

Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Tuesday tends to have the lowest number of delays on this route, whereas Wednesday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on London to Seattle flights?

Over the past year, Delta have had the lowest number of delays on this route, with just 6% of flights being delayed.

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 3 December 2025.
Read reviews from past customers who have flown with KLM, Virgin Atlantic, andAir France from London to Seattle. 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.
KLM
7.7
Good
1,426 reviews
Check prices

Food

7.2

Entertainment

7.1

Comfort

7.6

Crew

8.4

Boarding

7.8

Overall

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
1,426 reviews
KLM
7.7
Good
1,426 reviews
Check prices

Food

7.2

Entertainment

7.1

Comfort

7.6

Crew

8.4

Boarding

7.8

Overall

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
675 reviews
KLM
7.7
Good
1,426 reviews
Check prices

Food

7.2

Entertainment

7.1

Comfort

7.6

Crew

8.4

Boarding

7.8

Overall

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
1,500 reviews
KLM
7.7
Good
1,426 reviews
Check prices

Food

7.2

Entertainment

7.1

Comfort

7.6

Crew

8.4

Boarding

7.8

Overall

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
7.0
Good
584 reviews
KLM
7.7
Good
1,426 reviews
Check prices

Food

7.2

Entertainment

7.1

Comfort

7.6

Crew

8.4

Boarding

7.8

Overall

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
7,550 reviews
KLM
7.7
Good
1,426 reviews
Check prices

Food

7.2

Entertainment

7.1

Comfort

7.6

Crew

8.4

Boarding

7.8

Overall

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 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 17 daily inbound flights from London from 14 different airlines.

  • How long is the flight from London to Seattle?

    A quick flight from London to Seattle can take about 24h 43m. Lufthansa provides one of the quickest options available for as low as £486. There are 4783 mi between London and Seattle. This flight may include one or multiple stops.

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

    Icelandair, at £330, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Air France and Finnair. Icelandair is priced at 41% 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?

    £256 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Icelandair and British Airways, with prices starting from £360 and £376, 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 Scandinavian Airlines (95%), Air France (88%) or Delta (85%) 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 £1,695 for a flight from London to Seattle. The cheapest flight overall is £376 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £366.

  • 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, March is the cheapest month in which you can book a flight from London to Seattle (average of £309). Flying from London to Seattle in August is currently the most expensive (average of £467). 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
SeaTac

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 3 December 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 3 December 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£330Average£479FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£391Average£612FlexibilityNo cancel feeOn-time77%
Search Air France flights
FinnairCheapest£403Average£583FlexibilityNo cancel feeOn-time76%
Search Finnair flights
LufthansaCheapest£406Average£495FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
KLMCheapest£407Average£578FlexibilityNo cancel feeOn-time75%
Search KLM flights
United AirlinesCheapest£412Average£644FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£446Average£607FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£449Average£597FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapest£452Average£588FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Aer LingusCheapest£464Average£680FlexibilityNo 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 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.