HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Northern Ireland

$308+ Cheap flights from Seattle (SEA) to Northern Ireland

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/24. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
Feb 11 — Feb 181
Wed 2/11
Wed 2/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Northern Ireland with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Seattle to Northern Ireland

Keep the following information in mind while searching for Seattle to Northern Ireland flight deals. Data was last updated January 12, 2026.

Round-trip from

$582
(Cheapflightsfares)

One-way from

$308
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$951
From Seattle/Tacoma Intl to Northern Ireland
Search Deals
One-way flight from Seattle/Tacoma Intl to Northern Ireland
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($121 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($60 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Find flight deals from Seattle to Northern Ireland

Cheapest flights from Seattle to Northern Ireland
Explore the most affordable flight options available from Seattle to Northern Ireland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 12, 2026.

This Cheapflightsfares deal was found by Cheapflights users on 1/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/76:50 pm
SEA
-
BHD
1 stop13h 55m
British Airways
Tue 3/176:35 am
BHD
-
SEA
1 stop12h 55m
British Airways
Deal found 1/10$582
This oojo deal was found by Cheapflights users on 1/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/128:20 am
SEA
-
BHD
2 stops19h 40m
British Airways
Wed 8/197:40 pm
BHD
-
SEA
1 stop23h 55m
British Airways
Deal found 1/10$587
This American Airlines deal was found by Cheapflights users on 1/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/121:35 pm
SEA
-
BHD
1 stop15h 55m
American Airlines
Wed 8/195:15 pm
BHD
-
SEA
1 stop26h 20m
American Airlines
Deal found 1/10$591
This Cheapflightsfares deal was found by Cheapflights users on 1/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/76:50 pm
SEA
-
BHD
1 stop13h 55m
British Airways
Wed 3/1811:25 am
BHD
-
SEA
2 stops19h 59m
British Airways
Deal found 1/12$592
This FlightHub deal was found by Cheapflights users on 1/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/238:20 pm
SEA
-
BHD
2 stops16h 50m
British Airways
Thu 9/38:35 pm
BHD
-
SEA
1 stop23h 00m
British Airways
Deal found 1/10$636
This British Airways deal was found by Cheapflights users on 1/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/216:12 am
SEA
-
BHD
2 stops20h 03m
British Airways
Sun 1/253:10 pm
BHD
-
SEA
2 stops39h 10m
British Airways
Deal found 1/10$641

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Northern Ireland 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, Cheapflights users made 2,558,603 searches. Data last updated January 12, 2026.
Use the filters below to find and compare flights from Seattle to Northern Ireland that are best for you.

Fly from

Seattle

Fly to

Northern Ireland

Route

Depart

Return

Price

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

6:50 pm-4:45 pm

1 stop13h 55m

Belfast City

Tue 3/17

6:35 am-12:30 pm

1 stop12h 55m

$582

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

6:50 pm-4:45 pm

1 stop13h 55m

Belfast City

Wed 3/18

12:25 pm-5:55 pm

1 stop12h 30m

$582

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 2/24

2:35 pm-10:50 pm

3 stops48h 15m

$308

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 6/24

10:27 am-12:00 pm

2 stops17h 33m

$357

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 2/24

3:05 pm-4:50 pm

1 stop17h 45m

$407

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 6/23

7:05 am-7:45 am

3 stops40h 40m

$425

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 6/22

4:30 pm-3:15 pm

2 stops38h 45m

$427

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 6/23

7:05 am-9:20 am

3 stops42h 15m

$427

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 6/22

4:30 pm-4:50 pm

2 stops16h 20m

$444

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Wed 6/24

6:55 pm-10:20 pm

2 stops19h 25m

$455

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/10

Showing 1-10 of 18 results
1
2

Best time to book a flight from Seattle to Northern Ireland

Have a flexible travel schedule? Discover the best time to fly to Northern Ireland from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Northern Ireland
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Northern Ireland. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to Northern Ireland?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly out of when you book flights from Seattle to Northern Ireland.

  • How long is the flight from Seattle to Northern Ireland?

    Airlines like British Airways fly from Seattle to Northern Ireland in about 13h 55m. The time it takes to get you to your destination can typically vary by up to . The distance from Seattle to Northern Ireland is about 4472 mi.

  • Can I find deals for flights from Seattle to Northern Ireland that include hotel bookings?

    Yes. In addition to deals on Seattle to Northern Ireland flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Northern Ireland?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Northern Ireland.

  • Can I find deals for business class flights from Seattle to Northern Ireland?

    Yes. Cheapflights offers flight deals from Seattle to Northern Ireland by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Northern Ireland

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Heathrow flights
Seattle to Gatwick flights
Portland to Heathrow flights
Seattle to London City flights
Seattle to Stansted flights
Portland to Gatwick flights
Portland to London City flights
Seattle to Luton flights
Seattle to Edinburgh flights
Portland to Stansted flights
Seattle to Glasgow Intl flights
Portland to Edinburgh flights
Portland to Glasgow Intl flights
Seattle to Manchester flights
Spokane to Heathrow flights
Spokane to Gatwick flights
Seattle to Birmingham flights
Seattle to Belfast Intl flights
Seattle to Belfast City flights
Portland to Luton flights
Spokane to Manchester flights
Spokane to London City flights
Portland to Manchester flights
Pasco to Heathrow flights
Seattle to Newcastle upon Tyne flights
Spokane to Edinburgh flights
Walla Walla to Heathrow flights
Portland to Bristol flights
Portland to Inverness flights
Seattle to Southampton flights
Seattle to Cardiff flights
Seattle to Inverness flights
Seattle to Bristol flights
Seattle to Aberdeen flights
Seattle to Leeds flights
Spokane to Glasgow Intl flights
Seattle to Liverpool flights
Portland to Belfast Intl flights
Portland to Leeds flights
Portland to Belfast City flights
Seattle to Newquay flights
Portland to Aberdeen flights
Spokane to Southampton flights
Bellingham to Heathrow flights
Seattle to Southend flights
Seattle to Grimsby flights
Portland to Southend flights
Portland to Sumburgh/Shetland flights
Seattle to Darlington flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.