Northern Ireland

$254+ 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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
jul. 8 — jul. 151
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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 julio 3, 2025.

Round-trip from

$677
(Trip.com)

Popular in

August

Cheapest in

March

Average price

$1,145
From Seattle/Tacoma Intl to Northern Ireland
Highest demand for flights based on searches. 19% potential increase in price ($228 potential increase over avg. RT price).
Cheapest flight prices on average. 5% potential price decrease ($50 potential savings vs. average RT price).
Average for round-trip flights in July 2025

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 julio 3, 2025.

This Trip.com deal was found by Cheapflights users on 7/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/67:00 pmSEA - BFS
2 stops18h 30mMultiple Airlines
dom. 9/217:00 amBFS - SEA
2 stops42h 50mMultiple Airlines
Deal found 7/2$677
This Trip.com deal was found by Cheapflights users on 7/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/63:45 pmSEA - BHD
2 stops16h 10mMultiple Airlines
dom. 9/217:05 amBHD - SEA
2 stops45h 35mMultiple Airlines
Deal found 7/2$684
This Ovago deal was found by Cheapflights users on 7/2. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/13:00 pmSEA - BHD
2 stops16h 35mBritish Airways
mié. 10/226:50 amBHD - SEA
2 stops21h 56mBritish Airways
Deal found 7/2$770
This Mytrip deal was found by Cheapflights users on 7/3. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/177:35 pmSEA - BHD
2 stops30h 15mAer Lingus
dom. 8/244:55 pmBHD - SEA
2 stops32h 55mAer Lingus
Deal found 7/3$827
This Delta deal was found by Cheapflights users on 7/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/33:00 pmSEA - BHD
1 stop22h 00mDelta
dom. 12/76:30 amBHD - SEA
1 stop13h 20mDelta
Deal found 7/2$859
This KLM deal was found by Cheapflights users on 7/3. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/171:55 pmSEA - BHD
1 stop19h 00mKLM
dom. 8/245:25 pmBHD - SEA
1 stop26h 10mKLM
Deal found 7/3$860
This American Airlines deal was found by Cheapflights users on 7/2. 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.
mar. 12/21:23 amSEA - BHD
2 stops28h 52mAmerican Airlines
dom. 12/79:10 amBHD - SEA
2 stops17h 10mAmerican Airlines
Deal found 7/2$989

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 julio 3, 2025.
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 - BFS

SEABFS

Seattle/Tacoma Intl

sáb. 9/6

7:00 pm-9:30 pm

2 stops18h 30m

Belfast Intl

dom. 9/21

7:00 am-5:50 pm

2 stops42h 50m

$677

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

sáb. 9/6

3:45 pm-3:55 pm

2 stops16h 10m

Belfast City

dom. 9/21

7:05 am-8:40 pm

2 stops45h 35m

$684

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

mié. 10/1

3:00 pm-3:35 pm

2 stops16h 35m

Belfast City

mié. 10/22

6:50 am-8:46 pm

2 stops21h 56m

$770

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

dom. 8/17

7:35 pm-9:50 am

2 stops30h 15m

Belfast City

dom. 8/24

4:55 pm-5:50 pm

2 stops32h 55m

$827

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

mié. 12/3

3:00 pm-9:00 pm

1 stop22h 00m

Belfast City

dom. 12/7

6:30 am-11:50 am

1 stop13h 20m

$859

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

dom. 8/17

1:55 pm-4:55 pm

1 stop19h 00m

Belfast City

dom. 8/24

5:25 pm-11:35 am

1 stop26h 10m

$860

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

mar. 12/2

1:23 am-2:15 pm

2 stops28h 52m

Belfast City

dom. 12/7

9:10 am-6:20 pm

2 stops17h 10m

$989

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

mié. 10/15

7:00 pm-8:35 pm

2 stops17h 35m

$254

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

mié. 10/15

1:30 pm-11:55 am

1 stop14h 25m

$432

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

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

What is the cheapest time of day to fly from SEA to NIR?

Find hourly flight availability from Seattle to Northern Ireland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated julio 3, 2025.

When flying from Seattle to Northern Ireland, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing Northern Ireland

Get insights into the airlines that provide service to Northern Ireland. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Northern Ireland. Reviews last updated julio 3, 2025.
Read reviews from past customers who have flown Delta, KLM, and Aer Lingus from Seattle to Northern Ireland. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
8.0
Very good

Overall

8.0

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very good
8.0
Very good

Overall

8.0

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very good

Overall

8.0

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very good

Overall

8.0

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very good

Overall

8.0

Food

7.3

Comfort

7.9

Boarding

8.2

Entertainment

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

  • 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.

  • What is the cheapest month to book a flight from Seattle to Northern Ireland?

    Currently, February is the cheapest month in which you can book a flight from Seattle to Northern Ireland (average of $657). Flying from Seattle to Northern Ireland in June is currently the most expensive (average of $1,189). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Seattle to Northern Ireland

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Seattle to Northern Ireland

Discover the top airline that operate flights from Seattle to Northern Ireland. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated julio 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$519Average$866FlexibilityNo cancel feeOn-time70%

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