How long is the flight from London to Seattle?

A quick flight from London to Seattle can take about 13h. United Airlines provides one of the quickest options available for as low as £448. There are 4807 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 £323, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Air France and Lufthansa. 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?

£371 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 WestJet and Aer Lingus, with prices starting from £377 and £455, 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 City - 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 £1,530 for a flight from London to Seattle. The cheapest flight overall is £459 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £379.

What are the most reliable airlines from London to Seattle?

Consider Scandinavian Airlines (93%), KLM (89%) or Air France (89%) 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: American Airlines, Air Canada or Air France.

What is the cheapest day to fly round-trip from London to Seattle?

Leaving on a Tuesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 17% on the overall cost on flights from London to Seattle.

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

Travelers have found it’s best to book a flight 45 days in advance to save up to 41% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 45 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from London to Seattle 1-2 weeks in advance for as low as £545, or £789 for flights within the next 24 hours.

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

Due to multiple factors, expect to potentially pay more when booking in August. For low rates, January can be a great choice for travel to Seattle. Flights to Seattle from London in January are about £547 on average during January, but can be found for as low as £323.

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.

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.

£368+ Cheap Flights from London to Seattle

Q: 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 £463 and £569 in September. The cheapest return flight price found within the last 3 days was £445 on Air Canada (27 Sept-1 Oct).

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

Cheap flight deals from London to Seattle

Round-trip from	£445
One-way from	£368
Popular in	August
Cheapest in	January
Average price	£512
Good round-trip deal	£516 or less
Good one-way deal	£584 or less

Air Canada
27/9-1/10
4 total stops
35h 06m total
London to Seattle

Search Deals

WestJet
28/10
1 total stop
30h 30m total
London to Seattle

Search Deals

Highest demand for flights based on searches. 12% potential increase in price (£59 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 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

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 12 September 2025.

Sat 27/908:30LHR - SEA

2 stops18h 06mAir Canada

Wed 1/1005:30SEA - LHR

2 stops17h 00mAir Canada

Deal found 11/9£445

Thu 16/1015:40LGW - SEA

1 stop13h 00mIcelandair

Mon 20/1019:00SEA - LGW

1 stop11h 35mIcelandair

Deal found 11/9£446

Sun 21/912:20LHR - SEA

1 stop16h 34mUnited Airlines

Sun 28/907:00SEA - LHR

1 stop16h 25mUnited Airlines

Deal found 11/9£446

Mon 22/906:30LHR - SEA

2 stops15h 46mUnited Airlines

Thu 2/1007:00SEA - LHR

2 stops18h 20mUnited Airlines

Deal found 11/9£447

Mon 3/1115:35LHR - SEA

2 stops51h 00mFinnair

Sun 16/1100:59SEA - LHR

1 stop23h 16mFinnair

Deal found 11/9£447

Tue 7/1015:40LGW - SEA

1 stop13h 00mIcelandair

Mon 10/1114:35SEA - LGW

1 stop12h 20mIcelandair

Deal found 11/9£448

Wed 17/912:30LHR - SEA

1 stop17h 34mFinnair

Wed 24/913:50SEA - LHR

1 stop14h 55mFinnair

Deal found 10/9£448

Sun 5/1006:30LHR - SEA

1 stop13h 25mLufthansa

Wed 10/1207:00SEA - LHR

2 stops18h 40mLufthansa

Deal found 10/9£449

Sat 18/1015:40LGW - SEA

1 stop13h 00mIcelandair

Fri 24/1015:45SEA - LGW

1 stop14h 55mIcelandair

Deal found 11/9£450

Mon 22/913:25LHR - SEA

Nonstop10h 05mVirgin Atlantic

Mon 6/1017:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 11/9£450

Sat 20/909:50LGW - SEA

2 stops59h 02mMultiple Airlines

Sat 4/1021:39SEA - LGW

1 stop29h 16mMultiple Airlines

Deal found 10/9£450

Tue 2/1209:25LHR - SEA

Nonstop10h 05mBritish Airways

Tue 9/1213:25SEA - LHR

Nonstop9h 35mBritish Airways

Deal found 12/9£450

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 September 2025.

Mon 22/906:30LHR - SEA

2 stops15h 46mUnited Airlines

Thu 2/1015:35SEA - LHR

1 stop12h 45mUnited Airlines

Deal found 11/9£447

Tue 7/1015:40LGW - SEA

1 stop13h 00mIcelandair

Tue 11/1114:35SEA - LGW

1 stop12h 20mIcelandair

Deal found 11/9£448

Sun 5/1008:40LHR - SEA

1 stop35h 10mDelta

Thu 11/1219:20SEA - LHR

Nonstop9h 30mDelta

Deal found 10/9£461

Tue 2/1209:25LHR - SEA

Nonstop10h 05mBritish Airways

Tue 9/1213:28SEA - LHR

1 stop12h 57mBritish Airways

Deal found 11/9£461

Thu 20/1105:55STN - SEA

2 stops19h 05mMultiple Airlines

Thu 4/1214:35SEA - STN

2 stops24h 35mMultiple Airlines

Deal found 10/9£470

Thu 13/1118:15LCY - SEA

1 stop25h 55mLufthansa

Mon 17/1114:00SEA - LCY

1 stop19h 40mLufthansa

Deal found 10/9£474

Mon 3/1120:05LCY - SEA

1 stop23h 40mVirgin Atlantic

Mon 17/1115:00SEA - LCY

1 stop18h 20mVirgin Atlantic

Deal found 11/9£495

Sat 15/1107:30LHR - SEA

2 stops23h 12mUnited Airlines

Fri 21/1123:59SEA - LHR

2 stops23h 11mUnited Airlines

Deal found 12/9£447

Sat 18/1015:40LGW - SEA

1 stop13h 00mIcelandair

Fri 24/1015:45SEA - LGW

1 stop14h 55mIcelandair

Deal found 11/9£450

Tue 7/1009:55LHR - SEA

1 stop14h 10mDelta

Mon 10/1116:48SEA - LHR

Nonstop9h 42mDelta

Deal found 11/9£461

Sun 26/1015:00STN - SEA

2 stops34h 00mMultiple Airlines

Sun 2/1114:35SEA - STN

2 stops20h 00mMultiple Airlines

Deal found 11/9£477

Tue 7/1013:05LHR - SEA

1 stop15h 35mIcelandair

Wed 12/1114:35SEA - LHR

1 stop20h 55mIcelandair

Deal found 11/9£451

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 September 2025.

Mon 22/913:25LHR - SEA

Nonstop10h 05mVirgin Atlantic

Mon 6/1017:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 11/9£450

Tue 2/1209:25LHR - SEA

Nonstop10h 05mBritish Airways

Tue 9/1213:25SEA - LHR

Nonstop9h 35mBritish Airways

Deal found 12/9£450

Wed 8/1013:25LHR - SEA

Nonstop10h 05mVirgin Atlantic

Tue 14/1017:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 10/9£456

Tue 7/1013:25LHR - SEA

Nonstop10h 05mVirgin Atlantic

Tue 4/1119:20SEA - LHR

Nonstop9h 30mVirgin Atlantic

Deal found 10/9£458

Sat 1/1112:20LHR - SEA

Nonstop10h 25mVirgin Atlantic

Thu 13/1119:20SEA - LHR

Nonstop9h 30mVirgin Atlantic

Deal found 11/9£470

Fri 19/913:25LHR - SEA

Nonstop10h 05mVirgin Atlantic

Thu 25/917:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 11/9£471

Thu 18/917:25LHR - SEA

Nonstop10h 25mVirgin Atlantic

Tue 7/1020:25SEA - LHR

Nonstop9h 50mVirgin Atlantic

Deal found 9/9£472

Wed 8/1009:50LHR - SEA

Nonstop9h 45mAmerican Airlines

Wed 15/1020:20SEA - LHR

Nonstop9h 20mAmerican Airlines

Deal found 10/9£472

Wed 29/1012:20LHR - SEA

Nonstop10h 25mDelta

Thu 6/1119:20SEA - LHR

Nonstop9h 30mDelta

Deal found 11/9£474

Last-minute flights from London to Seattle
Discover last-minute flight deals from London to Seattle. Data last updated 12 September 2025 and is based on user searches.

Wed 17/912:30LHR - SEA

1 stop17h 34mFinnair

Wed 24/913:50SEA - LHR

1 stop14h 55mFinnair

Deal found 10/9£448

Thu 18/906:00LHR - SEA

2 stops24h 16mAir Canada

Sat 27/919:15SEA - LHR

2 stops32h 35mAir Canada

Deal found 10/9£447

Thu 18/906:30LHR - SEA

1 stop13h 25mLufthansa

Sat 27/913:12SEA - LHR

1 stop13h 28mLufthansa

Deal found 10/9£450

Sat 20/909:50LGW - SEA

2 stops59h 02mMultiple Airlines

Sat 4/1021:39SEA - LGW

1 stop29h 16mMultiple Airlines

Deal found 10/9£450

Sun 21/912:20LHR - SEA

1 stop16h 34mUnited Airlines

Sun 28/907:00SEA - LHR

1 stop16h 25mUnited Airlines

Deal found 11/9£446

Mon 22/906:30LHR - SEA

2 stops15h 46mUnited Airlines

Thu 2/1007:00SEA - LHR

2 stops18h 20mUnited Airlines

Deal found 11/9£447

Mon 22/913:25LHR - SEA

Nonstop10h 05mVirgin Atlantic

Mon 6/1017:35SEA - LHR

Nonstop9h 45mVirgin Atlantic

Deal found 11/9£450

Sat 27/908:30LHR - SEA

2 stops18h 06mAir Canada

Wed 1/1005:30SEA - LHR

2 stops17h 00mAir Canada

Deal found 11/9£445

Sun 5/1006:30LHR - SEA

1 stop13h 25mLufthansa

Wed 10/1207:00SEA - LHR

2 stops18h 40mLufthansa

Deal found 10/9£449

Tue 7/1015:40LGW - SEA

1 stop13h 00mIcelandair

Wed 12/1114:35SEA - LGW

1 stop12h 20mIcelandair

Deal found 11/9£448

Thu 16/1015:40LGW - SEA

1 stop13h 00mIcelandair

Mon 20/1019:00SEA - LGW

1 stop11h 35mIcelandair

Deal found 11/9£446

Sat 18/1015:40LGW - SEA

1 stop13h 00mIcelandair

Fri 24/1015:45SEA - LGW

1 stop14h 55mIcelandair

Deal found 11/9£450

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 September 2025.

Tue 28/1014:50LHR - SEA

1 stop30h 30mWestJet

Deal found 10/9£368

Sun 7/1207:55LGW - SEA

3 stops38h 36mMultiple Airlines

Deal found 11/9£369

Wed 1/1020:20STN - SEA

3 stops42h 55mMultiple Airlines

Deal found 10/9£369

Tue 16/915:50LHR - SEA

1 stop34h 00mAer Lingus

Deal found 11/9£369

Wed 24/914:10LHR - SEA

1 stop25h 05mMultiple Airlines

Deal found 10/9£370

Wed 1/1013:05LGW - SEA

1 stop16h 46mMultiple Airlines

Deal found 10/9£371

Tue 21/1007:00SEN - SEA

3 stops35h 49mMultiple Airlines

Deal found 9/9£371

Mon 8/1214:55LHR - SEA

Nonstop10h 00mBritish Airways

Deal found 10/9£371

Fri 26/914:10LHR - SEA

1 stop13h 42mMultiple Airlines

Deal found 10/9£371

Mon 10/1120:30STN - SEA

2 stops28h 30mMultiple Airlines

Deal found 11/9£373

Tue 4/1107:50LHR - SEA

2 stops20h 56mMultiple Airlines

Deal found 11/9£373

Sat 18/1009:25STN - SEA

2 stops19h 15mMultiple Airlines

Deal found 11/9£374

Fly from

Fly to

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 22/9

06:30-14:16

2 stops15h 46m

Seattle/Tacoma Intl

Thu 2/10

15:35-12:20

1 stop12h 45m

£447

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 15/11

07:30-22:42

2 stops23h 12m

Seattle/Tacoma Intl

Fri 21/11

23:59-07:10

2 stops23h 11m

£447

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 7/10

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Tue 11/11

14:35-10:55

1 stop12h 20m

£448

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sat 18/10

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Fri 24/10

15:45-14:40

1 stop14h 55m

£450

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 7/10

13:05-20:40

1 stop15h 35m

Seattle/Tacoma Intl

Wed 12/11

14:35-19:30

1 stop20h 55m

£451

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sat 4/10

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Tue 7/7

15:45-14:40

1 stop14h 55m

£456

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 27/10

06:30-13:10

1 stop13h 40m

Seattle/Tacoma Intl

Mon 3/11

19:13-21:20

2 stops18h 07m

£457

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 5/10

08:40-11:50

1 stop35h 10m

Seattle/Tacoma Intl

Thu 11/12

19:20-12:50

Nonstop9h 30m

£461

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 7/10

09:55-16:05

1 stop14h 10m

Seattle/Tacoma Intl

Mon 10/11

16:48-10:30

Nonstop9h 42m

£461

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 7/10

09:55-16:05

1 stop14h 10m

Seattle/Tacoma Intl

Wed 12/11

16:48-10:30

Nonstop9h 42m

£461

Flights are sorted by cheapest return flights first.

Deals found on 10/9

Showing 1-10 of 60 results

...

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?

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, 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?

Unlike in the afternoon, when flights are generally more expensive, you can save up to 16% 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?

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

The most flights from LON to SEA are scheduled on a Monday (21 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (10 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?

Reykjavik (KEF) – chosen by Cheapflights users on 79% of one-stop itineraries from London to Seattle on Cheapflights.

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

Calgary (YYC) is the most affordable one-stop option, with an average return flight price of £402.

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

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?

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

Reviews of airlines servicing Seattle

Read reviews from past customers who have flown with KLM, 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.

KLM

7.8

Good

1,385 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

KLM

7.8

Good

1,385 reviews

KLM

7.8

Good

1,385 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Air France

7.4

Good

1,469 reviews

KLM

7.8

Good

1,385 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Virgin Atlantic

7.4

Good

664 reviews

KLM

7.8

Good

1,385 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

Icelandair

7.0

Good

546 reviews

KLM

7.8

Good

1,385 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

British Airways

6.7

Okay

7,361 reviews

KLM

7.8

Good

1,385 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Mark,Sept 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

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 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 13h. United Airlines provides one of the quickest options available for as low as £448. There are 4807 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 £323, was found to be the cheapest airline from London to Seattle.Alternate airlines flying return to your destination include Air France and Lufthansa. 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?
£371 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 WestJet and Aer Lingus, with prices starting from £377 and £455, 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 (93%), KLM (89%) or Air France (89%) 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 £1,530 for a flight from London to Seattle. The cheapest flight overall is £459 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £379.
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

Tacoma

Leavenworth

Bothell

SeaTac

Browse thousands of different options on Cheapflights for your next trip

Top 10 airlines flying from London to Seattle

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£323	Average£495	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Air France	Cheapest£381	Average£569	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Lufthansa	Cheapest£392	Average£489	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Finnair	Cheapest£394	Average£537	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
KLM	Cheapest£401	Average£562	FlexibilityNo cancel fee	On-time75%	Search KLM flights
United Airlines	Cheapest£402	Average£640	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Aer Lingus	Cheapest£403	Average£654	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
British Airways	Cheapest£425	Average£588	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Virgin Atlantic	Cheapest£436	Average£528	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Delta	Cheapest£441	Average£590	FlexibilityNo cancel fee	On-timeN/A	Search Delta 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.

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.

Cheap flights from London to Seattle from £368

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 28/10. Fares are subject to change and may not be available on all flights or dates of travel.

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

Cheap flight deals from London to Seattle

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find 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 September 2025.

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 September 2025.

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

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 29 August 2025.

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 September 2025.

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.

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 September 2025.

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.

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.

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.

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.

Reviews of airlines servicing Seattle

Read reviews from past customers who have flown with KLM, 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

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?

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?

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 12 September 2025.

Top 10 airlines flying from London to Seattle

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?

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

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

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

100% Free

Book with Flexibility

Travel Smart

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 September 2025.