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Cheap flights from the United Kingdom to Seattle from $390

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from the United Kingdom to Seattle departing on 12/24. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from the United Kingdom to Seattle

Recent round-trip flight deals from the United Kingdom to Seattle

Enter your travel dates to find the best prices.
Icelandair Logo
12:15 pm - 6:00 pmLHR-SEA
12h 45m1 stop
Icelandair Logo
3:45 pm - 8:20 pmSEA-LHR
20h 35m1 stop
$591Icelandair
Find Deal
Thu, Mar 12 - Sun, Apr 12
Icelandair Logo
11:55 am - 5:00 pmLGW-SEA
13h 05m1 stop
Icelandair Logo
2:35 pm - 10:55 amSEA-LGW
12h 20m1 stop
$595Icelandair
Find Deal
Wed, Nov 12 - Wed, Nov 26
Virgin Atlantic Logo
6:20 am - 1:00 pmLHR-SEA
14h 40m1 stop
Virgin Atlantic Logo
5:40 pm - 10:30 amSEA-LHR
9h 50mnonstop
$623Virgin Atlantic
Find Deal
Wed, Mar 4 - Wed, Mar 11
Virgin Atlantic Logo
12:20 pm - 2:45 pmLHR-SEA
10h 25mnonstop
Virgin Atlantic Logo
5:40 pm - 10:30 amSEA-LHR
9h 50mnonstop
$635Virgin Atlantic
Find Deal
Wed, Mar 4 - Wed, Mar 11
Delta Logo
10:00 am - 11:50 amLHR-SEA
33h 50m1 stop
Delta Logo
6:00 am - 8:45 amSEA-LHR
18h 45m1 stop
$662Delta
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Tue, Dec 23 - Tue, Dec 30
Delta Logo
8:40 am - 10:23 pmLCY-SEA
21h 43m2 stops
Delta Logo
7:20 am - 8:10 amSEA-LCY
16h 50m2 stops
$761Delta
Find Deal
Thu, Nov 13 - Mon, Nov 17
British Airways Logo
12:35 pm - 4:55 pmMAN-SEA
12h 20m1 stop
British Airways Logo
6:50 pm - 5:35 pmSEA-MAN
14h 45m1 stop
$818British Airways
Find Deal
Tue, Nov 25 - Tue, Dec 2
British Airways Logo
12:35 pm - 11:25 pmMAN-SEA
18h 50m2 stops
British Airways Logo
6:50 pm - 4:20 pmSEA-MAN
13h 30m1 stop
$822British Airways
Find Deal
Tue, Dec 9 - Wed, Dec 24
American Airlines Logo
9:40 am - 11:18 pmMAN-SEA
21h 38m2 stops
American Airlines Logo
6:50 pm - 4:30 pmSEA-MAN
13h 40m1 stop
$829American Airlines
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Tue, Nov 4 - Mon, Nov 17
American Airlines Logo
1:25 pm - 11:30 amEDI-SEA
30h 05m1 stop
American Airlines Logo
1:48 pm - 3:15 pmSEA-EDI
18h 27m2 stops
$865American Airlines
Find Deal
Thu, Mar 5 - Mon, Mar 9

Icelandair flights from United Kingdom to Seattle

Our best Icelandair deals on United Kingdom to Seattle flight tickets
Icelandair
Mar 12
LHR12:15 pmLondon Heathrow
12h 45m
1 stop
SEA6:00 pmSeattle/Tacoma Intl
Apr 12
SEA3:45 pmSeattle/Tacoma Intl
20h 35m
1 stop
LHR8:20 pmLondon Heathrow
$591
Find similar
Icelandair
Nov 5
LHR12:15 pmLondon Heathrow
12h 45m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
Apr 3
SEA3:45 pmSeattle/Tacoma Intl
12h 10m
1 stop
LHR11:55 amLondon Heathrow
$595
Find similar
Icelandair
Dec 14
LHR12:15 pmLondon Heathrow
12h 45m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
Jan 6
SEA2:35 pmSeattle/Tacoma Intl
12h 15m
1 stop
LHR10:50 amLondon Heathrow
$596
Find similar

Virgin Atlantic flights from United Kingdom to Seattle

Our best Virgin Atlantic deals on United Kingdom to Seattle flight tickets
Virgin Atlantic
Mar 4
LHR6:20 amLondon Heathrow
14h 40m
1 stop
SEA1:00 pmSeattle/Tacoma Intl
Mar 11
SEA5:40 pmSeattle/Tacoma Intl
9h 50m
LHR10:30 amLondon Heathrow
$623
Find similar
Virgin Atlantic
Mar 4
LHR12:20 pmLondon Heathrow
10h 25m
SEA2:45 pmSeattle/Tacoma Intl
Mar 11
SEA5:40 pmSeattle/Tacoma Intl
9h 50m
LHR10:30 amLondon Heathrow
$635
Find similar
Virgin Atlantic
Mar 10
LHR2:45 pmLondon Heathrow
10h 05m
SEA5:50 pmSeattle/Tacoma Intl
Mar 17
SEA8:20 pmSeattle/Tacoma Intl
9h 30m
LHR12:50 pmLondon Heathrow
$636
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from United Kingdom to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated October 9, 2025.
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

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 3/12

12:15 pm-6:00 pm

1 stop12h 45m

Seattle/Tacoma Intl

Sun 4/12

3:45 pm-8:20 pm

1 stop20h 35m

$591

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Wed 11/12

11:55 am-5:00 pm

1 stop13h 05m

Seattle/Tacoma Intl

Wed 11/26

2:35 pm-10:55 am

1 stop12h 20m

$595

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 3/4

6:20 am-1:00 pm

1 stop14h 40m

Seattle/Tacoma Intl

Wed 3/11

5:40 pm-10:30 am

Nonstop9h 50m

$623

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 3/4

12:20 pm-2:45 pm

Nonstop10h 25m

Seattle/Tacoma Intl

Wed 3/11

5:40 pm-10:30 am

Nonstop9h 50m

$635

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 12/23

10:00 am-11:50 am

1 stop33h 50m

Seattle/Tacoma Intl

Tue 12/30

6:00 am-8:45 am

1 stop18h 45m

$662

LondonSeattle

LCY - SEA

LCYSEA

London City

Thu 11/13

8:40 am-10:23 pm

2 stops21h 43m

Seattle/Tacoma Intl

Mon 11/17

7:20 am-8:10 am

2 stops16h 50m

$761

ManchesterSeattle

MAN - SEA

MANSEA

Manchester

Tue 11/25

12:35 pm-4:55 pm

1 stop12h 20m

Seattle/Tacoma Intl

Tue 12/2

6:50 pm-5:35 pm

1 stop14h 45m

$818

ManchesterSeattle

MAN - SEA

MANSEA

Manchester

Tue 12/9

12:35 pm-11:25 pm

2 stops18h 50m

Seattle/Tacoma Intl

Wed 12/24

6:50 pm-4:20 pm

1 stop13h 30m

$822

ManchesterSeattle

MAN - SEA

MANSEA

Manchester

Tue 11/4

9:40 am-11:18 pm

2 stops21h 38m

Seattle/Tacoma Intl

Mon 11/17

6:50 pm-4:30 pm

1 stop13h 40m

$829

EdinburghSeattle

EDI - SEA

EDISEA

Edinburgh Turnhouse

Thu 3/5

1:25 pm-11:30 am

1 stop30h 05m

Seattle/Tacoma Intl

Mon 3/9

1:48 pm-3:15 pm

2 stops18h 27m

$865

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Seattle from

How to get the cheapest flight ticket from United Kingdom to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Seattle?

In general, January is the cheapest month to fly from United Kingdom to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $632. If you don’t want to visit Seattle in January, then you should wait until February to fly from United Kingdom, when ticket prices are also cheap, with an average price of $662.

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from United Kingdom is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $785. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Friday is the most expensive day to depart from United Kingdom because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,028.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from United Kingdom at noon is the least expensive time of day to depart. momondo users have found prices as low as $842 when looking at flights departing at noon. Flights to Seattle are more costly in the morning, with an average ticket price of $859. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest United Kingdom to Seattle/Tacoma Intl flight route?

Fly from London Heathrow to Seattle/Tacoma Intl for the best United Kingdom - Seattle/Tacoma Intl flight prices

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

You are more likely to see cheaper flights to Seattle from United Kingdom when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $775 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from United Kingdom for as low as $717 on momondo.

What cabin class options are available on United Kingdom to Seattle/Tacoma Intl flights?

There are 4 cabin classes available to choose from on United Kingdom to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on United Kingdom to Seattle flights?

You could potentially save up to 1% on your flight if you consider stops on a United Kingdom to Seattle flight.

Cheap United Kingdom to Seattle flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from United Kingdom to Seattle

Best Price Found

$640

Fastest flight time

9h 45m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from United Kingdom in the past 72 hours is $640. The best round-trip flight deal from United Kingdom to Seattle found on momondo in the last 72 hours is $720.
The fastest flight from United Kingdom to Seattle takes 9h 45m
Direct flights go from United Kingdom to Seattle every day.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)
Search flight deals

  • When did momondo last update prices for flights from United Kingdom to Seattle/Tacoma Intl Airport?

    Prices for flights from United Kingdom to Seattle/Tacoma Intl Airport were last updated today.

  • How many operators does momondo search for flights from United Kingdom to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from United Kingdom to Seattle/Tacoma Intl Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from United Kingdom to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The required travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from United Kingdom to Seattle?

Best airlines flying from United Kingdom to Seattle

Compare and see reviews for airlines that fly from United Kingdom to Seattle with momondo
Airline
Rating
Free Cancellation
Price
IcelandairPriceFrom $418Free CancellationRating
7.0
551 reviews
Search Icelandair flights
British AirwaysPriceFrom $421Free CancellationRating
6.7
7,446 reviews
Search British Airways flights
American AirlinesPriceFrom $589Free CancellationRating
7.2
11,043 reviews
Search American Airlines flights
Virgin AtlanticPriceFrom $594Free CancellationRating
7.4
665 reviews
Search Virgin Atlantic flights
DeltaPriceFrom $621Free CancellationRating
7.9
7,971 reviews
Search Delta flights
Air FrancePriceFrom $780Free CancellationRating
7.4
1,467 reviews
Search Air France flights

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Leavenworth
SeaTac
Ocean Shores
Renton
Olympia
Lynnwood
Kent
Marysville
Puyallup
Federal Way
Tukwila
Kirkland
Fife
Centralia
Lakewood
Shoreline
Cle Elum
Redmond
Westport

Why use momondo?

Why should I use momondo to find a flight deal from United Kingdom to Seattle?

It is quick and easy to find United Kingdom to Seattle flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Seattle that suits you.

Can I find flights from United Kingdom to Seattle with flexible booking policies on momondo?

Flights from United Kingdom to Seattle with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from United Kingdom to Seattle?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from United Kingdom to Seattle.

I’m not ready to book a flight from United Kingdom to Seattle right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Seattle from United Kingdom. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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