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Cheap flights from the United Kingdom to Seattle from £291

LHR — SEA
3 Oct — 10 Oct1
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

Thu 24/1211:55 -
1 stop13h 05m
Thu 7/114:35 -
1 stop12h 10m
Deal found 30/8£383
Wed 23/910:05 -
2 stops39h 50m
Tue 6/1019:00 -
2 stops20h 40m
Deal found 1/9£384
Wed 23/912:30 -
1 stop15h 57m
Tue 6/1010:42 -
1 stop13h 43m
Deal found 3/9£433
Mon 19/1007:00 -
1 stop12h 35m
Tue 27/1014:30 -
1 stop14h 50m
Deal found 30/8£437
Tue 15/915:00 -
1 stop37h 21m
Tue 29/913:30 -
1 stop16h 30m
Deal found 29/8£440
Sat 17/1006:20 -
1 stop19h 35m
Sat 24/1019:10 -
1 stop11h 20m
Deal found 2/9£465
Thu 12/1111:20 -
1 stop13h 40m
Mon 16/1114:35 -
1 stop11h 45m
Deal found 3/9£469
Thu 8/1005:55 -
1 stop13h 57m
Sat 17/1016:00 -
1 stop32h 15m
Deal found 29/8£473
Tue 20/1014:15 -
1 stop14h 25m
Sat 31/1015:35 -
1 stop11h 45m
Deal found 3/9£476
Wed 7/1005:55 -
1 stop18h 40m
Sat 17/1013:30 -
1 stop24h 50m
Deal found 1/9£477
Sat 17/1014:20 -
1 stop14h 20m
Tue 20/1019:00 -
1 stop10h 25m
Deal found 31/8£481
Wed 4/1107:00 -
1 stop17h 50m
Wed 11/1118:55 -
1 stop17h 05m
Deal found 2/9£481

Find flight deals from United Kingdom to Seattle

Round-trip from

£383

One-way from

£291

Popular in

August

Cheapest in

February

Average price

£543

Good round-trip deal

£554 or less

Good one-way deal

£439 or less
Icelandair
  • Icelandair
  • 24/12-7/1
  • 2 total stops
  • 25h 15m total
  • United Kingdom to Seattle
Search Deals
8/10-31/12
  • 8/10-31/12
  • 3 total stops
  • 37h 40m total
  • United Kingdom to Seattle
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£26 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£5 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2026
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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

ManchesterSeattle

MAN Manchester - SEA Seattle/Tacoma Intl

MANSEA

Manchester

Wed 9/9

22:25-09:40

3 stops43h 15m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£333

ManchesterSeattle

MAN Manchester - SEA Seattle/Tacoma Intl

MANSEA

Manchester

Tue 8/9

22:45-09:40

3 stops42h 55m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£354

ManchesterSeattle

MAN Manchester - SEA Seattle/Tacoma Intl

MANSEA

Manchester

Mon 21/9

14:30-09:40

3 stops51h 10m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£360

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Thu 10/12

10:00-08:45

2 stops30h 45m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£380

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 26/10

10:05-19:44

1 stop16h 39m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£382

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 1/3

06:30-17:27

2 stops18h 57m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£382

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Wed 25/11

10:00-22:03

2 stops20h 03m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£383

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Sun 27/12

11:55-17:00

1 stop13h 05m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£386

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 30/11

18:25-22:31

2 stops36h 06m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£386

LondonSeattle

LCY London City - SEA Seattle/Tacoma Intl

LCYSEA

London City

Fri 4/12

08:40-20:49

2 stops20h 09m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£388

Flights are sorted by cheapest return flights first.

Deals found on 1/9

Showing 1-10 of 60 resultsSorted by cheapest first
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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 £497). Flying from United Kingdom to Seattle in December is currently the most expensive (average of £653). 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 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 often are flights from the United Kingdom to Seattle delayed?

About 11% of weekly flights between United Kingdom 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 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?

Thursday 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 the United Kingdom to Seattle flights?

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

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

Booking 83 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
12,870 reviews
Check prices

Food

7.0

Comfort

7.8

Boarding

8.1

Crew

8.5

Entertainment

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
12,870 reviews
Alaska Airlines
7.9
Good
12,870 reviews
Check prices

Food

7.0

Comfort

7.8

Boarding

8.1

Crew

8.5

Entertainment

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
696 reviews
Alaska Airlines
7.9
Good
12,870 reviews
Check prices

Food

7.0

Comfort

7.8

Boarding

8.1

Crew

8.5

Entertainment

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
1,744 reviews
Alaska Airlines
7.9
Good
12,870 reviews
Check prices

Food

7.0

Comfort

7.8

Boarding

8.1

Crew

8.5

Entertainment

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
739 reviews
Alaska Airlines
7.9
Good
12,870 reviews
Check prices

Food

7.0

Comfort

7.8

Boarding

8.1

Crew

8.5

Entertainment

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
8,199 reviews
Alaska Airlines
7.9
Good
12,870 reviews
Check prices

Food

7.0

Comfort

7.8

Boarding

8.1

Crew

8.5

Entertainment

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 13h 05m. Aer Lingus provides one of the quickest options available for as low as £495. Airlines will cover a distance of 4445 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 £333. Users have also found prices from £337 and £364 on Icelandair and Virgin Atlantic, 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 City - 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 SAUDIA (79%), Scandinavian Airlines (78%) and KLM (75%).

  • 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 £1,832, our data indicates the cheapest price to be £313. The most popular route (London Heathrow - Seattle/Tacoma Intl), is priced around £299.

  • 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 £497). Flying from United Kingdom to Seattle in December is currently the most expensive (average of £653). 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

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Top 10 airlines flying from United Kingdom to Seattle

AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£333Average£515FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£339Average£579FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
British AirwaysCheapest£360Average£645FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Aer LingusCheapest£389Average£718FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£415Average£569FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£419Average£732FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
KLMCheapest£431Average£655FlexibilityNo cancel feeOn-time75%
Search KLM flights
DeltaCheapest£439Average£646FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air FranceCheapest£448Average£621FlexibilityNo cancel feeOn-time77%
Search Air France flights
Scandinavian AirlinesCheapest£459Average£690FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights

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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.

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