How long is the flight from London to Seattle?

A quick flight from London to Seattle can take about 10h. United Airlines provides one of the quickest options available for as low as £446. 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?

Lufthansa, at £332, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Icelandair and United Airlines. Lufthansa is priced at 40% 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?

£333 is the cheapest one-way deal found within the past few days, from British Airways. You may also be able to find cheap deals on Icelandair and Virgin Atlantic, with prices starting from £336 and £364, respectively.

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.

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).

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 Stansted - Seattle/Tacoma Intl as they are the most popular.

What are the cheapest flights from London to Seattle?

On average you can expect to pay £1,816 for a flight from London to Seattle. The cheapest flight overall is £314 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £319.

What are the most reliable airlines from London to Seattle?

Consider SAUDIA (79%), Scandinavian Airlines (78%) or KLM (75%) when booking your flight. These represent the most reliable airlines when flying from London to Seattle.

What are the most popular airlines that fly from London to Seattle?

Before booking your flight from London to Seattle check out the most popular airlines for this route: Virgin Atlantic, British Airways or Alaska Airlines.

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 23 daily inbound flights from London from 12 different airlines.

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.

£378+ Cheap Flights from London to Seattle

Cheapflights Tip: The best prices from London to Seattle/Tacoma Intl are usually found in February or January, booked 84 days in advance, depart on a Thursday or Wednesday and return on a Tuesday

Cheap flight deals from London to Seattle

Enter your travel dates to find the best prices.

Cheapest

Best

Direct

Last-minute

One-way

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 14 September 2026.

Thu 24/910:25 -

1 stop15h 23m

Sun 4/1013:30 -

1 stop11h 55m

Deal found 12/9£432

Sat 26/914:05 -

2 stops16h 42m

Thu 22/1010:50 -

1 stop18h 30m

Deal found 12/9£432

Sat 12/1210:45 -

1 stop14h 14m

Sat 9/116:55 -

Nonstop9h 45m

Deal found 13/9£432

Sat 12/1210:45 -

1 stop16h 08m

Wed 13/116:55 -

Nonstop9h 45m

Deal found 12/9£433

Sat 12/1209:50 -

1 stop18h 59m

Sat 6/216:55 -

Nonstop9h 45m

Deal found 14/9£434

Tue 29/914:05 -

2 stops16h 42m

Wed 7/1005:50 -

2 stops16h 40m

Deal found 11/9£435

Tue 15/1214:45 -

Nonstop10h 05m

Sun 20/1218:55 -

Nonstop9h 25m

Deal found 13/9£436

Sat 12/1210:00 -

2 stops32h 05m

Wed 13/107:15 -

2 stops24h 30m

Deal found 12/9£438

Wed 28/1014:45 -

Nonstop10h 20m

Thu 19/1118:55 -

Nonstop9h 25m

Deal found 12/9£438

Sat 12/1213:00 -

2 stops33h 37m

Sat 6/208:40 -

2 stops18h 40m

Deal found 14/9£438

Tue 6/1008:25 -

1 stop16h 10m

Wed 14/1017:45 -

1 stop16h 45m

Deal found 11/9£439

Sat 19/910:55 -

1 stop15h 59m

Fri 2/1021:50 -

Nonstop9h 45m

Deal found 10/9£439

Best flights from London to Seattle
Discover carefully curated flight deals from London to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 14 September 2026.

Thu 14/111:35 -

2 stops19h 56m

Mon 18/115:15 -

1 stop12h 35m

Deal found 13/9£441

Thu 24/910:00 -

1 stop14h 35m

Sat 3/1013:45 -

1 stop15h 30m

Deal found 11/9£446

Sat 3/1017:00 -

Nonstop10h 00m

Sat 19/1218:55 -

Nonstop9h 25m

Deal found 14/9£446

Thu 14/112:35 -

1 stop20h 09m

Mon 18/118:45 -

Nonstop9h 25m

Deal found 13/9£458

Fri 30/1008:20 -

1 stop20h 37m

Wed 11/1118:45 -

Nonstop9h 25m

Deal found 10/9£478

Thu 24/1206:20 -

1 stop15h 35m

Fri 1/116:55 -

Nonstop9h 45m

Deal found 13/9£490

Mon 12/1008:00 -

2 stops18h 32m

Mon 19/1007:00 -

2 stops17h 40m

Deal found 12/9£513

Tue 22/1211:55 -

1 stop13h 05m

Sun 10/114:35 -

1 stop12h 20m

Deal found 10/9£529

Sat 21/1107:35 -

2 stops17h 25m

Sun 29/1114:35 -

2 stops16h 35m

Deal found 10/9£566

Wed 30/908:25 -

1 stop16h 10m

Mon 5/1013:45 -

1 stop11h 45m

Deal found 9/9£692

Thu 18/217:20 -

2 stops38h 54m

Wed 3/319:05 -

1 stop30h 50m

Deal found 12/9£733

Thu 24/910:20 -

2 stops61h 51m

Sun 4/1017:40 -

1 stop13h 00m

Deal found 11/9£856

Wed 30/917:00 -

Nonstop10h 00m

Sun 20/1218:55 -

Nonstop9h 25m

Deal found 14/9£446

Sun 20/1213:35 -

2 stops28h 14m

Sun 27/1223:03 -

1 stop27h 47m

Deal found 10/9£495

Mon 21/1210:00 -

1 stop13h 13m

Sat 9/116:05 -

1 stop15h 40m

Deal found 10/9£501

Wed 28/1009:15 -

2 stops21h 03m

Wed 25/1110:50 -

2 stops42h 00m

Deal found 12/9£517

Sat 24/1006:50 -

2 stops20h 02m

Sat 31/1014:50 -

2 stops19h 15m

Deal found 9/9£531

Thu 5/1106:05 -

1 stop18h 55m

Sun 8/1114:35 -

1 stop16h 30m

Deal found 13/9£619

Wed 25/1112:20 -

Nonstop10h 30m

Tue 1/1216:50 -

Nonstop9h 50m

Deal found 9/9£570

Thu 22/1017:00 -

2 stops25h 36m

Thu 26/1111:49 -

2 stops19h 56m

Deal found 9/9£648

Sun 25/1008:40 -

2 stops21h 38m

Sun 1/1113:16 -

2 stops20h 34m

Deal found 10/9£600

Sun 22/1107:00 -

3 stops22h 57m

Thu 3/1214:35 -

2 stops17h 40m

Deal found 9/9£620

Sat 19/1216:40 -

1 stop28h 20m

Sat 2/119:10 -

2 stops26h 45m

Deal found 10/9£603

Sun 20/1214:45 -

Nonstop10h 05m

Mon 4/118:55 -

Nonstop9h 25m

Deal found 12/9£666

Sun 22/1117:20 -

1 stop31h 50m

Thu 3/1210:49 -

2 stops39h 06m

Deal found 9/9£739

Mon 19/1009:15 -

2 stops17h 17m

Thu 29/1010:50 -

2 stops19h 00m

Deal found 13/9£611

Sat 3/1008:25 -

1 stop16h 10m

Thu 8/1017:45 -

1 stop14h 55m

Deal found 12/9£619

Sat 21/1107:15 -

2 stops17h 45m

Sun 29/1114:35 -

2 stops16h 15m

Deal found 12/9£673

Thu 28/110:55 -

1 stop38h 15m

Sun 7/210:54 -

2 stops45h 26m

Deal found 13/9£743

Fri 16/1009:15 -

2 stops19h 46m

Thu 5/1113:16 -

2 stops19h 49m

Deal found 13/9£615

Find flight deals from London to Seattle

Round-trip from	£432
One-way from	£378
Popular in	August
Cheapest in	February
Average price	£546
Good round-trip deal	£475 or less
Good one-way deal	£558 or less

Delta
24/9-4/10
2 total stops
27h 18m total
London to Seattle

Search Deals

1/10-31/12
3 total stops
47h 30m total
London to Seattle

Search Deals

Highest demand for flights based on searches. 6% potential increase in price (£28 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (£6 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2026

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sun 27/12

06:30-20:50

2 stops22h 20m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£379

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Mon 28/12

11:55-17:00

1 stop13h 05m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£381

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sat 6/3

06:30-17:27

2 stops18h 57m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£381

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Wed 10/3

06:30-19:47

2 stops21h 17m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£381

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Mon 9/11

10:00-23:00

2 stops21h 00m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£383

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 9/3

09:00-20:48

2 stops19h 48m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£383

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Tue 15/12

10:00-20:42

2 stops18h 42m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£383

LondonSeattle

LCY London City - SEA Seattle/Tacoma Intl

LCYSEA

London City

Mon 9/11

17:50-11:47

1 stop25h 57m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£384

LondonSeattle

LCY London City - SEA Seattle/Tacoma Intl

LCYSEA

London City

Sat 26/12

10:00-11:50

1 stop33h 50m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£384

LondonSeattle

LCY London City - SEA Seattle/Tacoma Intl

LCYSEA

London City

Tue 1/12

09:15-23:13

2 stops21h 58m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£385

Flights are sorted by cheapest return flights first.

Deals found on 10/9

Showing 1-10 of 60 resultsSorted by cheapest first

...

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.

LON-SEA

LGW-SEA

LHR-SEA

LCY-SEA

STN-SEA

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

LON-SEA

LGW-SEA

LHR-SEA

LCY-SEA

STN-SEA

What is the cheapest month to book a flight from London to Seattle?

Currently, February is the cheapest month in which you can book a flight from London to Seattle (average of £478). Flying from London to Seattle in July is currently the most expensive (average of £635). 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?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London to Seattle as you normally would.

Weekly flight availability from London to Seattle

The most flights from LON to SEA are scheduled on a Tuesday (24 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (18 on average).

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

Airfare is below average for this route at the moment.

London to Seattle flights typically cost between £476 and £639 in September.
The cheapest return price found within the last 5 days was £432 on Delta (24 Sept–4 Oct).

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

Reykjavik (KEF) – chosen by Cheapflights users on 74% of one-stop itineraries from London to Seattle on Cheapflights.

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

Zurich (ZRH) is the most affordable one-stop option, with an average return flight price of £450.

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

Flights via Vancouver (YVR) have the shortest average one-way travel time for one-stop routes: 12h 46m.

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

Flights via Denver (DEN) offer the fastest connection on this route, with an average stopover time of 1h 18m.

How often are flights from London to Seattle delayed?

About 11% of weekly flights between London and Seattle have experienced delays in the past year, with the average delay time being 130 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?

Sunday tends to have the lowest number of delays on this route, whereas Tuesday 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 5% of flights being delayed.

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

Booking 83 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.

Reviews of airlines servicing Seattle

Read reviews from past customers who have flown with Alaska Airlines,KLM, andVirgin Atlantic 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.

Alaska Airlines

7.9

Good

12,926 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.

Alaska Airlines

7.9

Good

12,926 reviews

Alaska Airlines

7.9

Good

12,926 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jun 2026

LHR - SEA

KLM

7.8

Good

1,579 reviews

Alaska Airlines

7.9

Good

12,926 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jun 2026

LHR - SEA

Virgin Atlantic

7.4

Good

694 reviews

Alaska Airlines

7.9

Good

12,926 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jun 2026

LHR - SEA

Icelandair

6.9

Okay

743 reviews

Alaska Airlines

7.9

Good

12,926 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jun 2026

LHR - SEA

British Airways

6.7

Okay

8,220 reviews

Alaska Airlines

7.9

Good

12,926 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jun 2026

LHR - SEA

Related info for your journey

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 23 daily inbound flights from London from 12 different airlines.
How long is the flight from London to Seattle?
A quick flight from London to Seattle can take about 10h. United Airlines provides one of the quickest options available for as low as £446. 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?
Lufthansa, at £332, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Icelandair and United Airlines. Lufthansa is priced at 40% 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?
£333 is the cheapest one-way deal found within the past few days, from British Airways. You may also be able to find cheap deals on Icelandair and Virgin Atlantic, with prices starting from £336 and £364, 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 Stansted - Seattle/Tacoma Intl as they are the most popular.
What are the most reliable airlines from London to Seattle?
Consider SAUDIA (79%), Scandinavian Airlines (78%) or KLM (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 £1,816 for a flight from London to Seattle. The cheapest flight overall is £314 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £319.
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, February is the cheapest month in which you can book a flight from London to Seattle (average of £478). Flying from London to Seattle in July is currently the most expensive (average of £635). 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 London to Seattle on these airlines

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

Airline	Cheapest	Average	Flexibility	On-time
Lufthansa	Cheapest£332	Average£510	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Icelandair	Cheapest£333	Average£510	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
United Airlines	Cheapest£367	Average£485	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Aer Lingus	Cheapest£388	Average£634	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Delta	Cheapest£395	Average£645	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Virgin Atlantic	Cheapest£413	Average£591	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Air France	Cheapest£426	Average£608	FlexibilityNo cancel fee	On-time77%	Search Air France flights
KLM	Cheapest£429	Average£608	FlexibilityNo cancel fee	On-time75%	Search KLM flights
British Airways	Cheapest£447	Average£626	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Alaska Airlines	Cheapest£451	Average£591	FlexibilityNo cancel fee	On-time75%	Search Alaska Airlines flights

Fly with Cheapflights

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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Cheap flights from London to Seattle from £378

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from London to Seattle

Cheapest flights from London to SeattleExplore 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 14 September 2026.

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 14 September 2026.

Best flights from London to SeattleDiscover carefully curated flight deals from London to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 14 September 2026.

Discover carefully curated flight deals from London to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 14 September 2026.

Direct flights from London to SeattleExplore direct flight options from London to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 14 September 2026.

Explore direct flight options from London to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 14 September 2026.

Last-minute flights from London to SeattleDiscover last-minute flight deals from London to Seattle. Data last updated 14 September 2026 and is based on user searches.

Discover last-minute flight deals from London to Seattle. Data last updated 14 September 2026 and is based on user searches.

One-way flights from London to SeattleSearch for one-way flight options from London to Seattle. Find affordable one-way fares based on user searches. Data last updated 14 September 2026.

Search for one-way flight options from London to Seattle. Find affordable one-way fares based on user searches. Data last updated 14 September 2026.

Find flight deals from London to Seattle

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One-way from

Popular in

Cheapest in

Average price

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Good one-way deal

Cheapflights Fare Finder

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

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.

Cheapflights Insights

What is the cheapest month to book a flight from London to Seattle?

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 14 September 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London to Seattle as you normally would.

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 14 September 2026.

The most flights from LON to SEA are scheduled on a Tuesday (24 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (18 on average).

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

Airfare is below average for this route at the moment.

London to Seattle flights typically cost between £476 and £639 in September.The cheapest return price found within the last 5 days was £432 on Delta (24 Sept–4 Oct).

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 74% 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.

Zurich (ZRH) is the most affordable one-stop option, with an average return flight price of £450.

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 Vancouver (YVR) have the shortest average one-way travel time for one-stop routes: 12h 46m.

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 Denver (DEN) offer the fastest connection on this route, with an average stopover time of 1h 18m.

How often are flights from London to Seattle delayed?

About 11% of weekly flights between London and Seattle have experienced delays in the past year, with the average delay time being 130 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?

Sunday tends to have the lowest number of delays on this route, whereas Tuesday 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 5% of flights being delayed.

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

Booking 83 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.

Reviews of airlines servicing Seattle

Read reviews from past customers who have flown with Alaska Airlines,KLM, andVirgin Atlantic 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.

Related info for your journey

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How long is the flight from London to Seattle?

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

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

What are the most popular routes from London to Seattle?

What are the most reliable airlines from London to Seattle?

What are the cheapest flights from London to Seattle?

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

How can I find direct flights from London to Seattle?

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

What is the cheapest month to book a flight from London to Seattle?

Travelling to a place near Seattle?

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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 14 September 2026.

Alternative routes for London to Seattle

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Complete your trip

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 14 September 2026.

Best flights from London to Seattle
Discover carefully curated flight deals from London to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 14 September 2026.

Direct flights from London to Seattle
Explore direct flight options from London to Seattle based on user searches, and compare prices and availability for your desired travel dates. Data last updated 14 September 2026.

Last-minute flights from London to Seattle
Discover last-minute flight deals from London to Seattle. Data last updated 14 September 2026 and is based on user searches.

One-way flights from London to Seattle
Search for one-way flight options from London to Seattle. Find affordable one-way fares based on user searches. Data last updated 14 September 2026.

London to Seattle flights typically cost between £476 and £639 in September.
The cheapest return price found within the last 5 days was £432 on Delta (24 Sept–4 Oct).