How long is the flight from London to Seattle?

A quick flight from London to Seattle can take about 10h 15m. Alaska Airlines provides one of the quickest options available for as low as £431. 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 £333, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Lufthansa and United Airlines. 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?

£340 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 Alaska Airlines, with prices starting from £344 and £381, 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 £1,757 for a flight from London to Seattle. The cheapest flight overall is £350 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £348.

What are the most reliable airlines from London to Seattle?

Consider Scandinavian Airlines (83%), KLM (83%) or SAUDIA (83%) 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 24 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.

£391+ 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 73 days in advance, depart on a Thursday or Friday and return on a Wednesday

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 12 October 2026.

Tue 15/1212:15 -

1 stop12h 45m

Fri 25/1214:35 -

1 stop12h 15m

Deal found 9/10£413

Mon 23/1120:35 -

1 stop28h 25m

Mon 30/1114:35 -

1 stop12h 15m

Deal found 9/10£416

Fri 20/1112:15 -

1 stop12h 45m

Mon 30/1114:35 -

1 stop20h 55m

Deal found 9/10£417

Tue 15/1212:15 -

1 stop12h 45m

Mon 28/1214:35 -

1 stop12h 15m

Deal found 8/10£419

Mon 9/1120:35 -

1 stop28h 25m

Mon 23/1114:35 -

1 stop12h 15m

Deal found 9/10£420

Thu 19/1120:35 -

1 stop28h 25m

Wed 2/1214:35 -

1 stop20h 55m

Deal found 8/10£421

Sun 8/1114:45 -

Nonstop10h 15m

Sun 15/1118:45 -

Nonstop9h 35m

Deal found 11/10£422

Tue 24/1114:45 -

Nonstop10h 15m

Tue 1/1218:45 -

Nonstop9h 35m

Deal found 10/10£423

Fri 13/1114:45 -

Nonstop10h 15m

Thu 26/1118:45 -

Nonstop9h 35m

Deal found 8/10£423

Wed 25/1114:45 -

Nonstop10h 15m

Tue 1/1218:45 -

Nonstop9h 35m

Deal found 10/10£424

Sat 7/1114:45 -

Nonstop10h 15m

Sat 14/1118:45 -

Nonstop9h 35m

Deal found 10/10£425

Wed 18/1111:55 -

1 stop13h 05m

Mon 22/319:00 -

1 stop11h 40m

Deal found 9/10£431

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 12 October 2026.

Mon 9/1114:45 -

Nonstop10h 15m

Mon 23/1118:45 -

Nonstop9h 35m

Deal found 9/10£431

Thu 14/120:35 -

1 stop28h 25m

Mon 18/114:35 -

1 stop20h 55m

Deal found 12/10£509

Mon 8/306:30 -

1 stop13h 05m

Sun 14/318:00 -

Nonstop9h 40m

Deal found 10/10£566

Thu 19/1112:20 -

Nonstop10h 30m

Fri 4/1216:50 -

Nonstop9h 50m

Deal found 9/10£571

Tue 6/410:20 -

1 stop13h 40m

Sat 24/420:20 -

Nonstop9h 25m

Deal found 9/10£587

Thu 26/1110:00 -

2 stops33h 20m

Sun 6/1215:25 -

1 stop16h 20m

Deal found 12/10£624

Tue 9/217:20 -

2 stops37h 25m

Tue 9/311:00 -

2 stops38h 55m

Deal found 12/10£719

Sat 12/1214:45 -

Nonstop10h 15m

Tue 19/118:40 -

Nonstop9h 40m

Deal found 11/10£431

Wed 28/1014:45 -

Nonstop10h 20m

Mon 1/218:40 -

Nonstop9h 40m

Deal found 9/10£431

Wed 4/1114:45 -

Nonstop10h 15m

Sun 15/1118:45 -

Nonstop9h 35m

Deal found 8/10£431

Fri 20/1110:00 -

1 stop13h 14m

Tue 1/1216:05 -

1 stop15h 40m

Deal found 9/10£573

Sat 28/1109:25 -

Nonstop10h 00m

Thu 3/1207:30 -

1 stop20h 40m

Deal found 12/10£598

Sat 12/1209:50 -

1 stop18h 59m

Fri 8/116:55 -

Nonstop9h 45m

Deal found 12/10£577

Thu 22/1017:00 -

Nonstop10h 00m

Sat 8/521:30 -

Nonstop9h 35m

Deal found 10/10£503

Thu 5/1110:00 -

2 stops20h 05m

Sun 8/1106:00 -

2 stops19h 00m

Deal found 7/10£704

Thu 29/1017:20 -

2 stops29h 12m

Wed 11/1110:50 -

2 stops45h 30m

Deal found 11/10£720

Sat 12/1210:45 -

1 stop20h 07m

Tue 5/116:55 -

Nonstop9h 45m

Deal found 12/10£604

Sun 22/1106:30 -

2 stops24h 37m

Sat 5/1210:48 -

2 stops38h 22m

Deal found 12/10£746

Thu 19/1117:20 -

1 stop31h 50m

Fri 4/1210:48 -

2 stops39h 07m

Deal found 9/10£759

Sat 24/1015:40 -

1 stop12h 55m

Fri 7/519:00 -

1 stop11h 40m

Deal found 10/10£955

Fri 12/310:05 -

1 stop40h 05m

Tue 23/311:00 -

2 stops28h 35m

Deal found 8/10£767

Sun 8/1117:20 -

2 stops37h 47m

Sun 15/1119:05 -

1 stop37h 15m

Deal found 11/10£774

Fri 20/1110:05 -

1 stop39h 05m

Fri 4/1210:48 -

2 stops38h 22m

Deal found 9/10£776

Sun 28/315:40 -

1 stop34h 15m

Fri 9/415:53 -

2 stops14h 47m

Deal found 9/10£1,158

Wed 23/1210:00 -

1 stop13h 15m

Fri 1/115:25 -

1 stop16h 20m

Deal found 11/10£977

Tue 27/1006:30 -

2 stops40h 02m

Wed 3/210:52 -

2 stops38h 18m

Deal found 10/10£785

Mon 15/210:55 -

2 stops43h 50m

Mon 22/211:00 -

2 stops38h 55m

Deal found 11/10£785

Sun 10/117:20 -

1 stop31h 50m

Thu 14/110:52 -

2 stops39h 03m

Deal found 8/10£790

Tue 3/1117:20 -

1 stop32h 50m

Sun 15/1119:05 -

1 stop37h 15m

Deal found 8/10£794

Tue 27/1017:20 -

1 stop31h 50m

Wed 3/210:52 -

2 stops39h 03m

Deal found 10/10£809

Find flight deals from London to Seattle

Round-trip from	£413
One-way from	£391
Popular in	August
Cheapest in	February
Average price	£546
Good round-trip deal	£430 or less
Good one-way deal	£400 or less

Icelandair
15/12-25/12
2 total stops
25h 00m total
London to Seattle

Search Deals

7/1-31/12
2 total stops
33h 45m total
London to Seattle

Search Deals

Highest demand for flights based on searches. 7% potential increase in price (£32 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 October 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

Tue 16/3

14:45-17:50

Nonstop10h 05m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£393

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 6/4

17:00-19:10

Nonstop10h 10m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£396

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Fri 22/1

10:00-22:02

2 stops20h 02m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£404

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Wed 9/12

07:40-23:44

3 stops24h 04m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£412

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Fri 11/12

09:00-23:44

2 stops22h 44m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£416

Fastest return journey

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sun 6/12

14:55-16:50

Nonstop9h 55m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£421

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Fri 11/12

07:30-21:01

2 stops21h 31m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£423

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Fri 11/12

10:00-15:13

1 stop13h 13m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£426

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sat 13/3

08:40-17:27

2 stops16h 47m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£431

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 9/11

14:45-17:00

Nonstop10h 15m

Seattle/Tacoma Intl

Mon 23/11

18:45-12:20

Nonstop9h 35m

£431

Flights are sorted by cheapest return flights first.

Deals found on 12/10

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

LHR-SEA

LGW-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

LHR-SEA

LGW-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 £482). Flying from London to Seattle in July is currently the most expensive (average of £649). 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 Monday (24 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (24 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 £438 and £604 in December.
The cheapest return price found within the last 5 days was £413 on Icelandair (15 Dec–25 Dec).

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

Reykjavik (KEF) – chosen by Cheapflights users on 71% 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 £460.

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 12% of weekly flights between London and Seattle have experienced delays in the past year, with the average delay time being 134 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 Friday 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,Air France, 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

13,052 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

13,052 reviews

Alaska Airlines

7.9

Good

13,052 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jun 2026

LHR - SEA

Air France

7.5

Good

1,652 reviews

Alaska Airlines

7.9

Good

13,052 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jun 2026

LHR - SEA

Virgin Atlantic

7.5

Good

694 reviews

Alaska Airlines

7.9

Good

13,052 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jun 2026

LHR - SEA

Icelandair

6.9

Okay

758 reviews

Alaska Airlines

7.9

Good

13,052 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Anonymous,Jun 2026

LHR - SEA

British Airways

6.7

Okay

8,260 reviews

Alaska Airlines

7.9

Good

13,052 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 24 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 15m. Alaska Airlines provides one of the quickest options available for as low as £431. 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 £333, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Lufthansa and United Airlines. 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?
£340 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 Alaska Airlines, with prices starting from £344 and £381, 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 Scandinavian Airlines (83%), KLM (83%) or SAUDIA (83%) 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 £1,757 for a flight from London to Seattle. The cheapest flight overall is £350 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £348.
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 £482). Flying from London to Seattle in July is currently the most expensive (average of £649). 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
Icelandair	Cheapest£333	Average£521	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Lufthansa	Cheapest£339	Average£528	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£375	Average£496	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Aer Lingus	Cheapest£397	Average£656	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Delta	Cheapest£404	Average£647	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Virgin Atlantic	Cheapest£413	Average£605	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Air France	Cheapest£415	Average£615	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Alaska Airlines	Cheapest£432	Average£586	FlexibilityNo cancel fee	On-time75%	Search Alaska Airlines flights
KLM	Cheapest£434	Average£626	FlexibilityNo cancel fee	On-time75%	Search KLM flights
British Airways	Cheapest£444	Average£647	FlexibilityNo cancel fee	On-time70%	Search British Airways 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 £391

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/1. 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 12 October 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 12 October 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 12 October 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 12 October 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 12 October 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 12 October 2026.

Last-minute flights from London to SeattleDiscover last-minute flight deals from London to Seattle. Data last updated 12 October 2026 and is based on user searches.

Discover last-minute flight deals from London to Seattle. Data last updated 12 October 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 12 October 2026.

Search for one-way flight options from London to Seattle. Find affordable one-way fares based on user searches. Data last updated 12 October 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 12 October 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 12 October 2026.

The most flights from LON to SEA are scheduled on a Monday (24 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (24 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 £438 and £604 in December.The cheapest return price found within the last 5 days was £413 on Icelandair (15 Dec–25 Dec).

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 71% 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 £460.

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 12% of weekly flights between London and Seattle have experienced delays in the past year, with the average delay time being 134 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 Friday 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,Air France, 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

What airport do you fly into for flights to Seattle from London?

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 12 October 2026.

Alternative routes for London to Seattle

See prices for flight routes from nearby airports that may be better suited for you.

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 12 October 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 12 October 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 12 October 2026.

Last-minute flights from London to Seattle
Discover last-minute flight deals from London to Seattle. Data last updated 12 October 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 12 October 2026.

London to Seattle flights typically cost between £438 and £604 in December.
The cheapest return price found within the last 5 days was £413 on Icelandair (15 Dec–25 Dec).