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Cheap flights from the United Kingdom to Seattle from $350

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 4/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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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 - 5:00 pm
LHR
-
SEA
12h 45m1 stop
Icelandair Logo
3:35 pm - 10:50 am
SEA
-
LHR
12h 15m1 stop
$600Icelandair
Sun, Feb 1 - Sun, Mar 8
Icelandair Logo
11:55 am - 5:00 pm
LGW
-
SEA
13h 05m1 stop
Icelandair Logo
2:35 pm - 10:55 am
SEA
-
LGW
12h 20m1 stop
$605Icelandair
Thu, Feb 5 - Thu, Feb 19
Icelandair Logo
3:40 pm - 8:40 pm
LGW
-
SEA
13h 00m1 stop
Icelandair Logo
3:40 pm - 2:40 pm
SEA
-
LGW
15h 00m1 stop
$606Icelandair
Fri, Apr 10 - Mon, Apr 20
British Airways Logo
9:10 am - 9:54 pm
LCY
-
SEA
19h 44m2 stops
British Airways Logo
1:37 pm - 2:05 pm
SEA
-
LCY
41h 28m2 stops
$775British Airways
Tue, Mar 10 - Tue, Mar 17
British Airways Logo
9:10 am - 9:54 pm
LCY
-
SEA
19h 44m2 stops
British Airways Logo
1:37 pm - 2:05 pm
SEA
-
LCY
41h 28m2 stops
$782British Airways
Tue, Mar 10 - Tue, Mar 17
Virgin Atlantic Logo
8:05 pm - 11:50 am
LCY
-
SEA
23h 45m1 stop
Virgin Atlantic Logo
7:40 am - 9:30 am
SEA
-
LCY
17h 50m2 stops
$783Virgin Atlantic
Tue, Jan 27 - Tue, Feb 3
Virgin Atlantic Logo
10:00 am - 9:49 pm
LCY
-
SEA
19h 49m2 stops
Virgin Atlantic Logo
5:35 pm - 6:30 pm
SEA
-
LCY
16h 55m1 stop
$788Virgin Atlantic
Wed, Jan 21 - Wed, Sep 30
Delta Logo
9:15 am - 4:30 pm
EDI
-
SEA
15h 15m1 stop
Delta Logo
9:30 am - 12:20 pm
SEA
-
EDI
18h 50m2 stops
$836Delta
Tue, May 12 - Tue, May 19
Delta Logo
5:45 am - 4:13 pm
EDI
-
SEA
18h 28m2 stops
Delta Logo
9:30 am - 12:20 pm
SEA
-
EDI
18h 50m2 stops
$842Delta
Tue, May 12 - Tue, May 19
Air France Logo
6:05 am - 11:50 am
GLA
-
SEA
13h 45m1 stop
Air France Logo
3:10 pm - 4:35 pm
SEA
-
GLA
17h 25m1 stop
$1,621Air France
Thu, Jan 1 - Thu, Jan 22

Icelandair flights from United Kingdom to Seattle

Our best Icelandair deals on United Kingdom to Seattle flight tickets
Icelandair
Feb 1
LHR12:15 pmLondon Heathrow
12h 45m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
Mar 8
SEA3:35 pmSeattle/Tacoma Intl
12h 15m
1 stop
LHR10:50 amLondon Heathrow
$600
Find similar
Icelandair
Feb 5
LGW11:55 amLondon Gatwick
13h 05m
1 stop
SEA5:00 pmSeattle/Tacoma Intl
Feb 19
SEA2:35 pmSeattle/Tacoma Intl
12h 20m
1 stop
LGW10:55 amLondon Gatwick
$605
Find similar
Icelandair
Apr 10
LGW3:40 pmLondon Gatwick
13h 00m
1 stop
SEA8:40 pmSeattle/Tacoma Intl
Apr 20
SEA3:40 pmSeattle/Tacoma Intl
15h 00m
1 stop
LGW2:40 pmLondon Gatwick
$606
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 5
LHR12:20 pmLondon Heathrow
10h 25m
SEA2:45 pmSeattle/Tacoma Intl
Mar 10
SEA5:40 pmSeattle/Tacoma Intl
9h 50m
LHR10:30 amLondon Heathrow
$666
Find similar
Virgin Atlantic
Feb 24
LHR2:30 pmLondon Heathrow
10h 05m
SEA4:35 pmSeattle/Tacoma Intl
Mar 3
SEA6:00 amSeattle/Tacoma Intl
18h 45m
1 stop
LHR8:45 amLondon Heathrow
$670
Find similar
Virgin Atlantic
Mar 10
LHR8:25 pmLondon Heathrow
23h 10m
1 stop
SEA12:35 pmSeattle/Tacoma Intl
Mar 17
SEA7:25 pmSeattle/Tacoma Intl
9h 30m
LHR11:55 amLondon Heathrow
$684
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 December 15, 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

Sun 2/1

12:15 pm-5:00 pm

1 stop12h 45m

Seattle/Tacoma Intl

Sun 3/8

3:35 pm-10:50 am

1 stop12h 15m

$600

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Thu 2/5

11:55 am-5:00 pm

1 stop13h 05m

Seattle/Tacoma Intl

Thu 2/19

2:35 pm-10:55 am

1 stop12h 20m

$605

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Fri 4/10

3:40 pm-8:40 pm

1 stop13h 00m

Seattle/Tacoma Intl

Mon 4/20

3:40 pm-2:40 pm

1 stop15h 00m

$606

LondonSeattle

LCY - SEA

LCYSEA

London City

Tue 3/10

9:10 am-9:54 pm

2 stops19h 44m

Seattle/Tacoma Intl

Tue 3/17

1:37 pm-2:05 pm

2 stops41h 28m

$775

LondonSeattle

LCY - SEA

LCYSEA

London City

Tue 3/10

9:10 am-9:54 pm

2 stops19h 44m

Seattle/Tacoma Intl

Tue 3/17

1:37 pm-2:05 pm

2 stops41h 28m

$782

LondonSeattle

LCY - SEA

LCYSEA

London City

Tue 1/27

8:05 pm-11:50 am

1 stop23h 45m

Seattle/Tacoma Intl

Tue 2/3

7:40 am-9:30 am

2 stops17h 50m

$783

LondonSeattle

LCY - SEA

LCYSEA

London City

Wed 1/21

10:00 am-9:49 pm

2 stops19h 49m

Seattle/Tacoma Intl

Wed 9/30

5:35 pm-6:30 pm

1 stop16h 55m

$788

EdinburghSeattle

EDI - SEA

EDISEA

Edinburgh Turnhouse

Tue 5/12

9:15 am-4:30 pm

1 stop15h 15m

Seattle/Tacoma Intl

Tue 5/19

9:30 am-12:20 pm

2 stops18h 50m

$836

EdinburghSeattle

EDI - SEA

EDISEA

Edinburgh Turnhouse

Tue 5/12

5:45 am-4:13 pm

2 stops18h 28m

Seattle/Tacoma Intl

Tue 5/19

9:30 am-12:20 pm

2 stops18h 50m

$842

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Thu 1/1

6:05 am-11:50 am

1 stop13h 45m

Seattle/Tacoma Intl

Thu 1/22

3:10 pm-4:35 pm

1 stop17h 25m

$1,621

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 $643. 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 $653.

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 $776. 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 $924.

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

Flying to Seattle from United Kingdom in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $819 when looking at flights departing in the afternoon. Flights to Seattle are more costly in the evening, with an average ticket price of $859. Departure times in the evening 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 $763 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 $699 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 7% 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

$662

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 $662. The best round-trip flight deal from United Kingdom to Seattle found on momondo in the last 72 hours is $763.
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 in Seattle. From United Kingdom there are direct flights to 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
590 reviews
Search Icelandair flights
British AirwaysPriceFrom $421Free CancellationRating
6.7
7,580 reviews
Search British Airways flights
Virgin AtlanticPriceFrom $574Free CancellationRating
7.5
675 reviews
Search Virgin Atlantic flights
DeltaPriceFrom $575Free CancellationRating
7.9
8,010 reviews
Search Delta flights
American AirlinesPriceFrom $589Free CancellationRating
7.2
11,048 reviews
Search American Airlines flights
Air FrancePriceFrom $780Free CancellationRating
7.4
1,506 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
Redmond
Tukwila
Cle Elum
Federal Way
Lakewood
Fife
Centralia
Westport
Kirkland
Shoreline

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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