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Cheap flights from Northern Ireland to Seattle from £588

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from Northern Ireland to Seattle departing on 8/9. 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

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Northern Ireland to Seattle

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
12:50 - 11:45
BHD
-
SEA
30h 55m
2 stops
Multiple Airlines Logo
15:40 - 20:30
SEA
-
BHD
20h 50m
2 stops
£588Multiple Airlines
Tue, 8 Sep - Sun, 13 Sep
Multiple Airlines Logo
08:20 - 20:40
BFS
-
SEA
20h 20m
2 stops
Multiple Airlines Logo
15:40 - 22:35
SEA
-
BFS
22h 55m
2 stops
£599Multiple Airlines
Tue, 8 Sep - Sun, 13 Sep
Multiple Airlines Logo
08:00 - 19:00
BFS
-
SEA
19h 00m
1 stop
Multiple Airlines Logo
21:40 - 22:35
SEA
-
BFS
16h 55m
1 stop
£605Multiple Airlines
Tue, 8 Sep - Sun, 13 Sep
Multiple Airlines Logo
06:10 - 17:55
BFS
-
SEA
19h 45m
2 stops
Multiple Airlines Logo
15:40 - 19:20
SEA
-
BFS
19h 40m
2 stops
£609Multiple Airlines
Thu, 3 Sep - Thu, 10 Sep
Multiple Airlines Logo
09:50 - 11:45
BHD
-
SEA
33h 55m
2 stops
Multiple Airlines Logo
15:40 - 20:30
SEA
-
BHD
20h 50m
2 stops
£615Multiple Airlines
Mon, 7 Sep - Sun, 13 Sep
Multiple Airlines Logo
10:00 - 20:10
BFS
-
SEA
18h 10m
1 stop
Multiple Airlines Logo
21:50 - 23:10
SEA
-
BFS
17h 20m
1 stop
£629Multiple Airlines
Mon, 7 Sep - Sun, 13 Sep
British Airways Logo
06:35 - 16:50
BHD
-
SEA
18h 15m
1 stop
British Airways Logo
18:45 - 16:35
SEA
-
BHD
13h 50m
1 stop
£659British Airways
Tue, 15 Dec - Wed, 13 Jan
British Airways Logo
09:40 - 20:52
BHD
-
SEA
19h 12m
2 stops
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
£661British Airways
Tue, 8 Sep - Sun, 13 Sep
British Airways Logo
10:00 - 21:50
BHD
-
SEA
19h 50m
2 stops
British Airways Logo
18:45 - 16:35
SEA
-
BHD
13h 50m
1 stop
£668British Airways
Tue, 15 Dec - Wed, 13 Jan
KLM Logo
17:30 - 12:44
BHD
-
SEA
51h 14m
2 stops
KLM Logo
17:45 - 09:20
SEA
-
BHD
31h 35m
1 stop
£708KLM
Mon, 7 Sep - Sun, 13 Sep

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British Airways flights from Northern Ireland to Seattle

Our best British Airways deals on Northern Ireland to Seattle flight tickets
British Airways
15 Dec
BHD06:35Belfast City
18h 15m
1 stop
SEA16:50Seattle/Tacoma Intl
13 Jan
SEA18:45Seattle/Tacoma Intl
13h 50m
1 stop
BHD16:35Belfast City
£659
British Airways
8 Sept
BHD09:40Belfast City
19h 12m
2 stops
SEA20:52Seattle/Tacoma Intl
13 Sept
SEA20:20Seattle/Tacoma Intl
14h 25m
1 stop
BHD18:45Belfast City
£661
British Airways
15 Dec
BHD10:00Belfast City
19h 50m
2 stops
SEA21:50Seattle/Tacoma Intl
13 Jan
SEA18:45Seattle/Tacoma Intl
13h 50m
1 stop
BHD16:35Belfast City
£668

KLM flights from Northern Ireland to Seattle

Our best KLM deals on Northern Ireland to Seattle flight tickets
KLM
7 Sept
BHD17:30Belfast City
51h 14m
2 stops
SEA12:44Seattle/Tacoma Intl
13 Sept
SEA17:45Seattle/Tacoma Intl
31h 35m
1 stop
BHD09:20Belfast City
£708
KLM
21 Aug
BHD09:50Belfast City
17h 13m
2 stops
SEA19:03Seattle/Tacoma Intl
25 Aug
SEA13:33Seattle/Tacoma Intl
19h 22m
2 stops
BHD16:55Belfast City
£4,638
KLM
21 Aug
BHD09:50Belfast City
19h 00m
2 stops
SEA20:50Seattle/Tacoma Intl
24 Aug
SEA09:35Seattle/Tacoma Intl
15h 45m
2 stops
BHD09:20Belfast City
£4,642

momondo Fare Finder

 
Customise your flight search to find flights from Northern Ireland 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 25 July 2026.
Use the filters below to find and compare flights from Northern Ireland to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 8/9

12:50-11:45

2 stops30h 55m

Seattle/Tacoma Intl

Sun 13/9

15:40-20:30

2 stops20h 50m

£588

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 8/9

08:20-20:40

2 stops20h 20m

Seattle/Tacoma Intl

Sun 13/9

15:40-22:35

2 stops22h 55m

£599

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 8/9

08:00-19:00

1 stop19h 00m

Seattle/Tacoma Intl

Sun 13/9

21:40-22:35

1 stop16h 55m

£605

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 3/9

06:10-17:55

2 stops19h 45m

Seattle/Tacoma Intl

Thu 10/9

15:40-19:20

2 stops19h 40m

£609

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 7/9

09:50-11:45

2 stops33h 55m

Seattle/Tacoma Intl

Sun 13/9

15:40-20:30

2 stops20h 50m

£615

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 7/9

10:00-20:10

1 stop18h 10m

Seattle/Tacoma Intl

Sun 13/9

21:50-23:10

1 stop17h 20m

£629
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 15/12

06:35-16:50

1 stop18h 15m

Seattle/Tacoma Intl

Wed 13/1

18:45-16:35

1 stop13h 50m

£659

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 8/9

09:40-20:52

2 stops19h 12m

Seattle/Tacoma Intl

Sun 13/9

20:20-18:45

1 stop14h 25m

£661

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 15/12

10:00-21:50

2 stops19h 50m

Seattle/Tacoma Intl

Wed 13/1

18:45-16:35

1 stop13h 50m

£668

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 7/9

17:30-12:44

2 stops51h 14m

Seattle/Tacoma Intl

Sun 13/9

17:45-09:20

1 stop31h 35m

£708

Flights are sorted by cheapest return flights first.

Showing 1-10 of 19 resultsSorted by cheapest first
1
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See travel insights to Seattle from

How to get the cheapest flight ticket from Northern Ireland 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 Northern Ireland to Seattle/Tacoma Intl?

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

Cheap Northern Ireland to Seattle flight deals and tips

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

Fastest flight time

30h 55m

Direct flights

None
The fastest flight from Northern Ireland to Seattle takes 30h 55m
There are no direct flights from Northern Ireland to Seattle. There are no popular flight routes from Northern Ireland to Seattle.
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Frequently asked questions about flying from Northern Ireland to Seattle

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

    Prices for flights from Northern Ireland to Seattle/Tacoma Intl Airport refresh daily.

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

  • How old do you have to be to fly from Northern Ireland 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 Northern Ireland 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 Northern Ireland to Seattle

Compare and see reviews for airlines that fly from Northern Ireland to Seattle with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom £563Free CancellationRating
7.1
11,847 reviews
Search American Airlines flights

Travelling to a place near Seattle?

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

Why use momondo?

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

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

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

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

How can momondo help me find flights from Northern Ireland to Seattle?

momondo helps you find the best flight between Northern Ireland and Seattle by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Price alerts on flights to Seattle from Northern Ireland are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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