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Cheap flights from Northern Ireland to Seattle from £429

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 22/7. 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
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
11:34 - 12:00
SEA
-
BHD
16h 26m
2 stops
£577British Airways
Wed, 16 Sep - Wed, 7 Oct
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
20:20 - 18:55
SEA
-
BHD
14h 35m
1 stop
£578British Airways
Tue, 1 Sep - Tue, 22 Sep
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
13:30 - 10:45
SEA
-
BHD
13h 15m
1 stop
£579British Airways
Tue, 15 Sep - Tue, 6 Oct
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
12:00 - 15:20
SEA
-
BHD
19h 20m
2 stops
£588British Airways
Tue, 15 Sep - Tue, 6 Oct
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
11:34 - 13:35
SEA
-
BHD
18h 01m
2 stops
£599British Airways
Wed, 16 Sep - Wed, 7 Oct
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
13:38 - 15:20
SEA
-
BHD
17h 42m
2 stops
£608British Airways
Tue, 1 Sep - Tue, 22 Sep
Multiple Airlines Logo
20:25 - 18:47
BHD
-
SEA
30h 22m
2 stops
Multiple Airlines Logo
13:38 - 15:20
SEA
-
BHD
17h 42m
2 stops
£621Multiple Airlines
Tue, 1 Sep - Tue, 22 Sep
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
£662British Airways
Wed, 16 Sep - Wed, 7 Oct
British Airways Logo
09:15 - 16:55
BHD
-
SEA
15h 40m
1 stop
British Airways Logo
14:46 - 16:40
SEA
-
BHD
17h 54m
2 stops
£664British Airways
Mon, 2 Nov - Thu, 12 Nov
Multiple Airlines Logo
06:15 - 20:40
BFS
-
SEA
22h 25m
2 stops
Multiple Airlines Logo
13:30 - 23:20
SEA
-
BFS
25h 50m
3 stops
£687Multiple Airlines
Tue, 15 Sep - Tue, 6 Oct

British Airways flights from Northern Ireland to Seattle

Our best British Airways deals on Northern Ireland to Seattle flight tickets
British Airways
16 Sept
BHD06:30Belfast City
13h 05m
1 stop
SEA11:35Seattle/Tacoma Intl
7 Oct
SEA11:34Seattle/Tacoma Intl
16h 26m
2 stops
BHD12:00Belfast City
£577
British Airways
1 Sept
BHD06:30Belfast City
13h 05m
1 stop
SEA11:35Seattle/Tacoma Intl
22 Sept
SEA20:20Seattle/Tacoma Intl
14h 35m
1 stop
BHD18:55Belfast City
£578
British Airways
15 Sept
BHD06:30Belfast City
13h 05m
1 stop
SEA11:35Seattle/Tacoma Intl
6 Oct
SEA13:30Seattle/Tacoma Intl
13h 15m
1 stop
BHD10:45Belfast City
£579

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 6 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

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Wed 7/10

11:34-12:00

2 stops16h 26m

£577

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 1/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Tue 22/9

20:20-18:55

1 stop14h 35m

£578
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 15/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Tue 6/10

13:30-10:45

1 stop13h 15m

£579

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 15/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Tue 6/10

12:00-15:20

2 stops19h 20m

£588

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 16/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Wed 7/10

11:34-13:35

2 stops18h 01m

£599

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 1/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Tue 22/9

13:38-15:20

2 stops17h 42m

£608

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 1/9

20:25-18:47

2 stops30h 22m

Seattle/Tacoma Intl

Tue 22/9

13:38-15:20

2 stops17h 42m

£621

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

£662

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 2/11

09:15-16:55

1 stop15h 40m

Seattle/Tacoma Intl

Thu 12/11

14:46-16:40

2 stops17h 54m

£664

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 15/9

06:15-20:40

2 stops22h 25m

Seattle/Tacoma Intl

Tue 6/10

13:30-23:20

3 stops25h 50m

£687

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.
Search flight deals

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
11,651 reviews
Search American Airlines flights

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Fife
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Ashford
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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