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Cheap flights from Belfast to Seattle from £404

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Belfast to Seattle departing on 25/10. 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
1 adult, Economy, 0 bags

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Find the cheapest flights from Belfast to Seattle

Cheap return flights

Enter your travel dates to find the best prices.
British Airways Logo
20:35 - 11:35
BHD
-
SEA
23h 00m
1 stop
British Airways Logo
11:34 - 13:35
SEA
-
BHD
18h 01m
2 stops
£574British Airways
Wed, 16 Sep - Wed, 7 Oct
British Airways Logo
09:40 - 21:36
BHD
-
SEA
19h 56m
2 stops
British Airways Logo
20:20 - 17:35
SEA
-
BHD
13h 15m
1 stop
£578British Airways
Tue, 15 Sep - Tue, 6 Oct
British Airways Logo
09:40 - 21:36
BHD
-
SEA
19h 56m
2 stops
British Airways Logo
12:00 - 15:20
SEA
-
BHD
19h 20m
2 stops
£586British Airways
Tue, 15 Sep - Tue, 6 Oct
British Airways Logo
15:20 - 11:35
BHD
-
SEA
28h 15m
1 stop
British Airways Logo
17:40 - 20:35
SEA
-
BHD
18h 55m
2 stops
£593British Airways
Mon, 7 Sep - Mon, 28 Sep
KLM Logo
09:50 - 11:47
BHD
-
SEA
33h 57m
1 stop
KLM Logo
17:45 - 16:55
SEA
-
BHD
15h 10m
1 stop
£596KLM
Tue, 15 Sep - Tue, 6 Oct
British Airways Logo
06:30 - 17:10
BHD
-
SEA
18h 40m
2 stops
British Airways Logo
17:40 - 19:25
SEA
-
BHD
17h 45m
2 stops
£598British Airways
Mon, 7 Sep - Mon, 28 Sep
British Airways Logo
20:35 - 11:35
BHD
-
SEA
23h 00m
1 stop
British Airways Logo
13:30 - 12:55
SEA
-
BHD
15h 25m
1 stop
£603British Airways
Thu, 1 Oct - Mon, 5 Oct
British Airways Logo
20:35 - 11:35
BHD
-
SEA
23h 00m
1 stop
British Airways Logo
13:30 - 12:55
SEA
-
BHD
15h 25m
1 stop
£605British Airways
Thu, 1 Oct - Mon, 5 Oct
British Airways Logo
12:45 - 00:11
BHD
-
SEA
19h 26m
2 stops
British Airways Logo
11:34 - 15:30
SEA
-
BHD
19h 56m
2 stops
£607British Airways
Thu, 1 Oct - Mon, 5 Oct
Multiple Airlines Logo
22:10 - 17:10
BFS
-
SEA
27h 00m
2 stops
Multiple Airlines Logo
19:10 - 19:30
SEA
-
BFS
16h 20m
2 stops
£724Multiple Airlines
Fri, 10 Jul - Thu, 16 Jul

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British Airways flights from Belfast to Seattle

Our best British Airways deals on Belfast to Seattle flight tickets
British Airways
16 Sept
BHD20:35Belfast City
23h 00m
1 stop
SEA11:35Seattle/Tacoma Intl
7 Oct
SEA20:20Seattle/Tacoma Intl
14h 25m
1 stop
BHD18:45Belfast City
£574
British Airways
15 Sept
BHD09:40Belfast City
19h 56m
2 stops
SEA21:36Seattle/Tacoma Intl
6 Oct
SEA20:20Seattle/Tacoma Intl
13h 15m
1 stop
BHD17:35Belfast City
£578
British Airways
15 Sept
BHD09:40Belfast City
19h 56m
2 stops
SEA21:36Seattle/Tacoma Intl
6 Oct
SEA12:00Seattle/Tacoma Intl
19h 20m
2 stops
BHD15:20Belfast City
£586

KLM flights from Belfast to Seattle

Our best KLM deals on Belfast to Seattle flight tickets
KLM
15 Sept
BHD09:50Belfast City
33h 57m
1 stop
SEA11:47Seattle/Tacoma Intl
6 Oct
SEA17:45Seattle/Tacoma Intl
15h 10m
1 stop
BHD16:55Belfast City
£596
KLM
22 Jun
BHD17:30Belfast City
30h 54m
1 stop
SEA16:24Seattle/Tacoma Intl
28 Jun
SEA17:45Seattle/Tacoma Intl
15h 10m
1 stop
BHD16:55Belfast City
£616
KLM
14 Sept
BHD17:30Belfast City
28h 30m
2 stops
SEA14:00Seattle/Tacoma Intl
20 Sept
SEA13:50Seattle/Tacoma Intl
19h 05m
1 stop
BHD16:55Belfast City
£4,670

momondo Fare Finder

 
Customise your flight search to find flights from Belfast 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 279,928 searches. Data last updated 15 June 2026.
Use the filters below to find and compare flights from Belfast to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 16/9

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Wed 7/10

11:34-13:35

2 stops18h 01m

£574
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 15/9

09:40-21:36

2 stops19h 56m

Seattle/Tacoma Intl

Tue 6/10

20:20-17:35

1 stop13h 15m

£578

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 15/9

09:40-21:36

2 stops19h 56m

Seattle/Tacoma Intl

Tue 6/10

12:00-15:20

2 stops19h 20m

£586

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 7/9

15:20-11:35

1 stop28h 15m

Seattle/Tacoma Intl

Mon 28/9

17:40-20:35

2 stops18h 55m

£593

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 15/9

09:50-11:47

1 stop33h 57m

Seattle/Tacoma Intl

Tue 6/10

17:45-16:55

1 stop15h 10m

£596

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 7/9

06:30-17:10

2 stops18h 40m

Seattle/Tacoma Intl

Mon 28/9

17:40-19:25

2 stops17h 45m

£598

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 1/10

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Mon 5/10

13:30-12:55

1 stop15h 25m

£603

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 1/10

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Mon 5/10

13:30-12:55

1 stop15h 25m

£605

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 1/10

12:45-00:11

2 stops19h 26m

Seattle/Tacoma Intl

Mon 5/10

11:34-15:30

2 stops19h 56m

£607

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 10/7

22:10-17:10

2 stops27h 00m

Seattle/Tacoma Intl

Thu 16/7

19:10-19:30

2 stops16h 20m

£724

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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2

See travel insights to Seattle from

How to get the cheapest flight ticket from Belfast 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 airline that flies from Belfast to Seattle/Tacoma Intl?

British Airways and Aer Lingus are the most popular carriers operating from Belfast to Seattle/Tacoma Intl

Cheap Belfast to Seattle flight deals and tips

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

Fastest flight time

13h 05m

Direct flights

None
The fastest flight from Belfast to Seattle takes 13h 05m
There are no direct flights from Belfast to Seattle. There are no popular flight routes from Belfast to Seattle.
Search flight deals

Frequently asked questions about flying from Belfast to Seattle

  • How far is Belfast to Seattle/Tacoma Intl by plane?

    Seattle/Tacoma Intl is 4463.0 mi away from Belfast. By plane, this route typically takes 13h 05m.

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

    Prices for flights from Belfast to Seattle/Tacoma Intl Airport are refreshed on a daily basis.

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Belfast to Seattle/Tacoma Intl Airport.

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

    The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Belfast to Seattle

Compare and see reviews for airlines that fly from Belfast to Seattle with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom £559Free CancellationRating
7.1
11,660 reviews
Search American Airlines flights

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Kirkland
Fife
Ashford
Tacoma
SeaTac
Tukwila

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Belfast to Seattle. momondo saves you time and could save you money on your trip.

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

momondo does allow users to show only those flights to Seattle from Belfast which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Belfast to Seattle?

momondo provides multiple filters to help you find the best flight to Seattle from Belfast. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Yes momondo offers price alerts on flights to Seattle from Belfast. 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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