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Cheap flights from Northern Ireland to Seattle from £458

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 11/7. 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
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.
Delta Logo
17:20 - 11:50
BHD
-
SEA
26h 30m
1 stop
Delta Logo
15:05 - 16:50
SEA
-
BHD
17h 45m
1 stop
£508Delta
Mon, 26 Jan - Mon, 2 Feb
Delta Logo
17:20 - 11:50
BHD
-
SEA
26h 30m
1 stop
Delta Logo
09:25 - 16:50
SEA
-
BHD
23h 25m
2 stops
£511Delta
Mon, 26 Jan - Mon, 2 Feb
Delta Logo
17:20 - 16:55
BHD
-
SEA
31h 35m
2 stops
Delta Logo
09:25 - 16:50
SEA
-
BHD
23h 25m
2 stops
£518Delta
Mon, 26 Jan - Mon, 2 Feb
British Airways Logo
06:35 - 16:55
BHD
-
SEA
18h 20m
1 stop
British Airways Logo
07:21 - 14:15
SEA
-
BHD
23h 54m
2 stops
£534British Airways
Sat, 7 Mar - Mon, 9 Mar
British Airways Logo
06:35 - 16:55
BHD
-
SEA
18h 20m
1 stop
British Airways Logo
07:21 - 14:15
SEA
-
BHD
23h 54m
2 stops
£535British Airways
Sat, 7 Mar - Mon, 9 Mar
British Airways Logo
11:25 - 16:55
BHD
-
SEA
13h 30m
1 stop
British Airways Logo
14:10 - 10:40
SEA
-
BHD
36h 30m
2 stops
£538British Airways
Wed, 4 Feb - Sun, 8 Feb
British Airways Logo
06:35 - 16:55
BHD
-
SEA
18h 20m
1 stop
British Airways Logo
14:10 - 10:40
SEA
-
BHD
36h 30m
2 stops
£539British Airways
Wed, 4 Feb - Sun, 8 Feb
British Airways Logo
06:35 - 16:55
BHD
-
SEA
18h 20m
1 stop
British Airways Logo
14:10 - 10:40
SEA
-
BHD
36h 30m
2 stops
£540British Airways
Wed, 4 Feb - Sun, 8 Feb
British Airways Logo
06:35 - 22:07
BHD
-
SEA
23h 32m
2 stops
British Airways Logo
14:10 - 10:40
SEA
-
BHD
36h 30m
2 stops
£542British Airways
Wed, 4 Feb - Sun, 8 Feb
Multiple Airlines Logo
22:20 - 17:00
BFS
-
SEA
26h 40m
2 stops
Multiple Airlines Logo
22:15 - 10:45
SEA
-
BFS
28h 30m
1 stop
£716Multiple Airlines
Mon, 26 Jan - Mon, 2 Feb

British Airways flights from Northern Ireland to Seattle

Our best British Airways deals on Northern Ireland to Seattle flight tickets
British Airways
7 Mar
BHD06:35Belfast City
18h 20m
1 stop
SEA16:55Seattle/Tacoma Intl
9 Mar
SEA07:21Seattle/Tacoma Intl
23h 54m
2 stops
BHD14:15Belfast City
£534
British Airways
7 Mar
BHD06:35Belfast City
18h 20m
1 stop
SEA16:55Seattle/Tacoma Intl
9 Mar
SEA19:50Seattle/Tacoma Intl
15h 45m
1 stop
BHD18:35Belfast City
£535
British Airways
4 Feb
BHD11:25Belfast City
13h 30m
1 stop
SEA16:55Seattle/Tacoma Intl
8 Feb
SEA14:10Seattle/Tacoma Intl
36h 30m
2 stops
BHD10:40Belfast City
£538

Delta flights from Northern Ireland to Seattle

Our best Delta deals on Northern Ireland to Seattle flight tickets
Delta
26 Jan
BHD17:20Belfast City
26h 30m
1 stop
SEA11:50Seattle/Tacoma Intl
2 Feb
SEA15:05Seattle/Tacoma Intl
17h 45m
1 stop
BHD16:50Belfast City
£508
Delta
26 Jan
BHD17:20Belfast City
26h 30m
1 stop
SEA11:50Seattle/Tacoma Intl
2 Feb
SEA09:25Seattle/Tacoma Intl
23h 25m
2 stops
BHD16:50Belfast City
£511
Delta
26 Jan
BHD17:20Belfast City
31h 35m
2 stops
SEA16:55Seattle/Tacoma Intl
2 Feb
SEA09:25Seattle/Tacoma Intl
23h 25m
2 stops
BHD16:50Belfast City
£518

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 16 January 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

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 26/1

17:20-11:50

1 stop26h 30m

Seattle/Tacoma Intl

Mon 2/2

15:05-16:50

1 stop17h 45m

£508

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 26/1

17:20-11:50

1 stop26h 30m

Seattle/Tacoma Intl

Mon 2/2

09:25-16:50

2 stops23h 25m

£511

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 26/1

17:20-16:55

2 stops31h 35m

Seattle/Tacoma Intl

Mon 2/2

09:25-16:50

2 stops23h 25m

£518

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 7/3

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Mon 9/3

07:21-14:15

2 stops23h 54m

£534

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 7/3

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Mon 9/3

07:21-14:15

2 stops23h 54m

£535

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

11:25-16:55

1 stop13h 30m

Seattle/Tacoma Intl

Sun 8/2

14:10-10:40

2 stops36h 30m

£538

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Sun 8/2

14:10-10:40

2 stops36h 30m

£539

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Sun 8/2

14:10-10:40

2 stops36h 30m

£540

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

06:35-22:07

2 stops23h 32m

Seattle/Tacoma Intl

Sun 8/2

14:10-10:40

2 stops36h 30m

£542

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 26/1

22:20-17:00

2 stops26h 40m

Seattle/Tacoma Intl

Mon 2/2

22:15-10:45

1 stop28h 30m

£716

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?

Aer Lingus and American Airlines 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 30m

Direct flights

None
The fastest flight from Northern Ireland to Seattle takes 13h 30m
There are no direct flights from Northern Ireland to Seattle. There are no popular flight routes from Northern Ireland to Seattle.
Search flight deals

  • 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
British AirwaysPriceFrom £439Free CancellationRating
6.7
7,681 reviews
Search British Airways flights
American AirlinesPriceFrom £560Free CancellationRating
7.2
11,141 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
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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