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Cheap flights from Northern Ireland to Seattle from £389

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Northern Ireland to Seattle departing on 7/9. 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

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Find the cheapest flights from Northern Ireland 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 - 12:00
SEA
-
BHD
16h 26m
2 stops
£554British Airways
Wed, 16 Sep - Wed, 7 Oct
British Airways Logo
20:35 - 11:35
BHD
-
SEA
23h 00m
1 stop
British Airways Logo
13:30 - 12:00
SEA
-
BHD
14h 30m
1 stop
£555British Airways
Wed, 23 Sep - Wed, 14 Oct
British Airways Logo
20:35 - 11:35
BHD
-
SEA
23h 00m
1 stop
British Airways Logo
20:20 - 19:50
SEA
-
BHD
15h 30m
1 stop
£581British Airways
Wed, 23 Sep - Wed, 14 Oct
British Airways Logo
10:05 - 21:36
BHD
-
SEA
19h 31m
2 stops
British Airways Logo
11:34 - 12:00
SEA
-
BHD
16h 26m
2 stops
£585British 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
£586British Airways
Tue, 15 Sep - Tue, 6 Oct
KLM Logo
17:30 - 11:47
BHD
-
SEA
26h 17m
1 stop
KLM Logo
09:30 - 09:20
SEA
-
BHD
15h 50m
2 stops
£591KLM
Wed, 23 Sep - Wed, 14 Oct
Multiple Airlines Logo
09:50 - 22:02
BHD
-
SEA
20h 12m
2 stops
Multiple Airlines Logo
09:30 - 09:20
SEA
-
BHD
15h 50m
2 stops
£598Multiple Airlines
Wed, 23 Sep - Wed, 14 Oct
Delta Logo
09:50 - 18:55
BHD
-
SEA
17h 05m
2 stops
Delta Logo
07:30 - 09:20
SEA
-
BHD
17h 50m
2 stops
£603Delta
Wed, 23 Sep - Wed, 14 Oct
KLM Logo
09:50 - 11:47
BHD
-
SEA
33h 57m
1 stop
KLM Logo
17:45 - 16:55
SEA
-
BHD
15h 10m
1 stop
£604KLM
Tue, 15 Sep - Tue, 6 Oct
Multiple Airlines Logo
20:15 - 20:40
BFS
-
SEA
32h 25m
3 stops
Multiple Airlines Logo
15:40 - 20:15
SEA
-
BFS
20h 35m
3 stops
£721Multiple Airlines
Wed, 16 Sep - Wed, 7 Oct

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KLM flights from Northern Ireland to Seattle

Our best KLM deals on Northern Ireland to Seattle flight tickets
KLM
23 Sept
BHD17:30Belfast City
26h 17m
1 stop
SEA11:47Seattle/Tacoma Intl
14 Oct
SEA09:30Seattle/Tacoma Intl
15h 50m
2 stops
BHD09:20Belfast City
£591
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
£604
KLM
22 Jun
BHD10:05Belfast City
33h 32m
1 stop
SEA11:37Seattle/Tacoma Intl
28 Jun
SEA09:30Seattle/Tacoma Intl
16h 05m
2 stops
BHD09:35Belfast City
£624

American Airlines flights from Northern Ireland to Seattle

Our best American Airlines deals on Northern Ireland to Seattle flight tickets
American Airlines
19 Jul
BHD06:30Belfast City
25h 09m
2 stops
SEA23:39Seattle/Tacoma Intl
27 Jul
SEA11:07Seattle/Tacoma Intl
20h 23m
2 stops
BHD15:30Belfast City
£717
American Airlines
19 Jul
BHD06:30Belfast City
13h 05m
1 stop
SEA11:35Seattle/Tacoma Intl
27 Jul
SEA13:30Seattle/Tacoma Intl
15h 25m
1 stop
BHD12:55Belfast City
£748
American Airlines
19 Jul
BHD06:30Belfast City
13h 05m
1 stop
SEA11:35Seattle/Tacoma Intl
27 Jul
SEA20:20Seattle/Tacoma Intl
14h 25m
1 stop
BHD18:45Belfast City
£749

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 19 June 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

Wed 16/9

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Wed 7/10

11:34-12:00

2 stops16h 26m

£554

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 23/9

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Wed 14/10

13:30-12:00

1 stop14h 30m

£555

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 23/9

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Wed 14/10

20:20-19:50

1 stop15h 30m

£581

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 16/9

10:05-21:36

2 stops19h 31m

Seattle/Tacoma Intl

Wed 7/10

11:34-12:00

2 stops16h 26m

£585
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

£586

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 23/9

17:30-11:47

1 stop26h 17m

Seattle/Tacoma Intl

Wed 14/10

09:30-09:20

2 stops15h 50m

£591

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 23/9

09:50-22:02

2 stops20h 12m

Seattle/Tacoma Intl

Wed 14/10

09:30-09:20

2 stops15h 50m

£598

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 23/9

09:50-18:55

2 stops17h 05m

Seattle/Tacoma Intl

Wed 14/10

07:30-09:20

2 stops17h 50m

£603

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

£604

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 16/9

20:15-20:40

3 stops32h 25m

Seattle/Tacoma Intl

Wed 7/10

15:40-20:15

3 stops20h 35m

£721

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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?

British Airways and Aer Lingus 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

13h 05m

Direct flights

None
The fastest flight from Northern Ireland to Seattle takes 13h 05m
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 £567Free CancellationRating
7.1
11,703 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 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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