Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from the United Kingdom to Seattle from £335

LHR — SEA
30 Oct — 6 Nov1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from United Kingdom to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from United Kingdom to Seattle

Mon 5/1012:25 -
1 stop16h 11m
Mon 19/1015:00 -
1 stop32h 10m
Deal found 28/9£416
Thu 8/1013:05 -
1 stop15h 35m
Wed 21/1019:00 -
1 stop32h 55m
Deal found 29/9£416
Thu 19/1106:30 -
1 stop13h 17m
Wed 20/116:55 -
Nonstop9h 45m
Deal found 28/9£417
Thu 22/1009:55 -
1 stop14h 40m
Thu 5/1123:59 -
1 stop22h 26m
Deal found 29/9£418
Thu 8/1006:00 -
2 stops20h 32m
Wed 21/1015:00 -
1 stop14h 20m
Deal found 29/9£419
Sun 4/1018:30 -
Nonstop10h 25m
Sat 17/1023:10 -
1 stop23h 35m
Deal found 27/9£419
Sat 7/1106:30 -
1 stop13h 17m
Mon 8/309:00 -
1 stop17h 00m
Deal found 28/9£420
Wed 14/1010:25 -
2 stops20h 39m
Wed 11/1115:25 -
1 stop16h 20m
Deal found 27/9£421
Fri 2/1006:30 -
2 stops20h 15m
Fri 16/1021:50 -
Nonstop9h 45m
Deal found 25/9£421
Wed 9/1206:20 -
1 stop16h 53m
Tue 19/116:55 -
Nonstop9h 45m
Deal found 28/9£422
Wed 14/1010:25 -
2 stops20h 39m
Wed 4/1115:25 -
1 stop33h 35m
Deal found 26/9£422
Thu 10/1208:55 -
1 stop12h 55m
Thu 14/116:55 -
Nonstop9h 45m
Deal found 28/9£422

Find flight deals from United Kingdom to Seattle

Round-trip from

£416

One-way from

£335

Popular in

August

Cheapest in

February

Average price

£560

Good round-trip deal

£436 or less

Good one-way deal

£503 or less
Austrian Airlines
  • Austrian Airlines
  • 5/2-8/2
  • 2 total stops
  • 28h 00m total
  • United Kingdom to Seattle
Search Deals
25/1-31/12
  • 25/1-31/12
  • 2 total stops
  • 58h 55m total
  • United Kingdom to Seattle
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£30 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 United Kingdom to Seattle/Tacoma Intl.
Search Deals
Price to beat on a one-way flight from United Kingdom to Seattle/Tacoma Intl.
Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

GlasgowSeattle

GLA Glasgow Intl - SEA Seattle/Tacoma Intl

GLASEA

Glasgow Intl

Fri 22/1

21:50-08:52

3 stops43h 02m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£360

ManchesterSeattle

MAN Manchester - SEA Seattle/Tacoma Intl

MANSEA

Manchester

Sat 23/1

18:25-08:52

2 stops46h 27m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£380

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Thu 26/11

09:50-17:10

1 stop15h 20m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£393

AberdeenSeattle

ABZ Aberdeen Dyce - SEA Seattle/Tacoma Intl

ABZSEA

Aberdeen Dyce

Sun 7/3

06:10-17:00

2 stops42h 50m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£413

EdinburghSeattle

EDI Edinburgh Turnhouse - SEA Seattle/Tacoma Intl

EDISEA

Edinburgh Turnhouse

Tue 23/3

13:15-17:55

1 stop11h 40m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£415

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Fri 4/12

09:00-23:44

2 stops22h 44m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£416

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Wed 23/12

12:20-14:50

Nonstop10h 30m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£425

GlasgowSeattle

GLA Glasgow Intl - SEA Seattle/Tacoma Intl

GLASEA

Glasgow Intl

Tue 26/1

22:05-16:40

1 stop26h 35m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£427

AberdeenSeattle

ABZ Aberdeen Dyce - SEA Seattle/Tacoma Intl

ABZSEA

Aberdeen Dyce

Tue 1/12

09:00-16:50

1 stop15h 50m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£429

GlasgowSeattle

GLA Glasgow Intl - SEA Seattle/Tacoma Intl

GLASEA

Glasgow Intl

Sat 12/12

11:55-17:00

1 stop13h 05m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£429

Flights are sorted by cheapest return flights first.

Deals found on 26/9

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

Best time to book a flight from United Kingdom to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from United Kingdom with our price prediction graph.
Estimated return price

Cheapflights Insights

Everything you need to know about your flight from the United Kingdom to Seattle

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

Currently, February is the cheapest month in which you can book a flight from United Kingdom to Seattle (average of £507). Flying from United Kingdom to Seattle in July is currently the most expensive (average of £664). 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 GB to SEA?

When flying from United Kingdom to Seattle, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from United Kingdom to Seattle

The most flights from GB0 to SEA are scheduled on a Monday (24 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (17 on average).

How often are flights from the United Kingdom to Seattle delayed?

About 12% of weekly flights between United Kingdom 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 the United Kingdom 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 the United Kingdom 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 United Kingdom to Seattle?

Booking 73 days in advance of your planned departure date is, on average, the best time to get cheap flights from United Kingdom 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,Virgin Atlantic, andAer Lingus from the United Kingdom 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
12,992 reviews
Check prices

Crew

8.5

Entertainment

7.0

Comfort

7.8

Boarding

8.1

Food

7.0

Overall

7.9

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
12,992 reviews
Alaska Airlines
7.9
Good
12,992 reviews
Check prices

Crew

8.5

Entertainment

7.0

Comfort

7.8

Boarding

8.1

Food

7.0

Overall

7.9

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.
Virgin Atlantic
7.4
Good
694 reviews
Alaska Airlines
7.9
Good
12,992 reviews
Check prices

Crew

8.5

Entertainment

7.0

Comfort

7.8

Boarding

8.1

Food

7.0

Overall

7.9

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.
Aer Lingus
7.3
Good
1,800 reviews
Alaska Airlines
7.9
Good
12,992 reviews
Check prices

Crew

8.5

Entertainment

7.0

Comfort

7.8

Boarding

8.1

Food

7.0

Overall

7.9

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.
Icelandair
6.9
Okay
757 reviews
Alaska Airlines
7.9
Good
12,992 reviews
Check prices

Crew

8.5

Entertainment

7.0

Comfort

7.8

Boarding

8.1

Food

7.0

Overall

7.9

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.
British Airways
6.7
Okay
8,242 reviews
Alaska Airlines
7.9
Good
12,992 reviews
Check prices

Crew

8.5

Entertainment

7.0

Comfort

7.8

Boarding

8.1

Food

7.0

Overall

7.9

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.

Related info for your journey

  • What airport do you fly into for flights to Seattle from United Kingdom?

    For a flight from United Kingdom to Seattle, you will be flying into Seattle/Tacoma Intl. Seattle/Tacoma Intl (SEA) is just 11.4 mi from the center of the city.

  • How long is the flight from United Kingdom to Seattle?

    A quick flight from United Kingdom to Seattle can take about 10h 15m. KLM provides one of the quickest options available for as low as £431. Airlines will cover a distance of 4783 mi. Both multi-stop and direct flights can be found to your destination and back.

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

    For one-way options, check prices for British Airways. According to our data, you can fly for as low as £340. Users have also found prices from £344 and £351 on Icelandair and KLM, respectively.

  • What are the most popular routes from United Kingdom to Seattle?

    The most popular flight routes from United Kingdom to Seattle are London Heathrow - Seattle/Tacoma Intl, London Gatwick - Seattle/Tacoma Intl and London Stansted - Seattle/Tacoma Intl.

  • What are the most reliable airlines from United Kingdom to Seattle?

    The top 3 most reliable airlines when flying from United Kingdom to Seattle are Scandinavian Airlines (82%), KLM (81%) and SAUDIA (81%).

  • What are the cheapest flights from United Kingdom to Seattle?

    Looking for the cheapest flight from United Kingdom to Seattle? While on average our users pay £1,846, our data indicates the cheapest price to be £361. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £334.

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

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

  • How can I find direct flights from United Kingdom to Seattle?

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

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

    Yes. Cheapflights offers flight deals from United Kingdom 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 United Kingdom to Seattle?

    Currently, February is the cheapest month in which you can book a flight from United Kingdom to Seattle (average of £507). Flying from United Kingdom to Seattle in July is currently the most expensive (average of £664). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Federal Way
SeaTac

Browse thousands of different options on Cheapflights for your next trip

Top 10 airlines flying from United Kingdom to Seattle

AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£338Average£599FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
LufthansaCheapest£339Average£534FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
British AirwaysCheapest£368Average£634FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£375Average£496FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Aer LingusCheapest£397Average£736FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
DeltaCheapest£404Average£659FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air FranceCheapest£415Average£617FlexibilityNo cancel feeOn-time77%
Search Air France flights
Virgin AtlanticCheapest£418Average£741FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
KLMCheapest£437Average£685FlexibilityNo cancel feeOn-time75%
Search KLM flights
Alaska AirlinesCheapest£438Average£589FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

Fly with Cheapflights

How does Cheapflights help users find flights from United Kingdom to Seattle?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from United Kingdom to Seattle. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

Cheapflights helps you find that perfect flight to Seattle from United Kingdom by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Cheapflights does show flights with no change fees to all users. To see these options for flights from United Kingdom to Seattle, users can toggle the no change fees filter when performing a flight search.

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

Yes! Start tracking prices for United Kingdom to Seattle flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your 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.