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$717+ Cheap flights from Seattle (SEA) to Northern Ireland

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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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 June 12, 2025.

Round-trip from

$717
(SmartFares)

Popular in

August

Cheapest in

March
From Seattle/Tacoma Intl to Northern Ireland
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($228 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($50 potential savings vs. average RT price).
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 June 12, 2025.

This SmartFares deal was found by Cheapflights users on 6/12. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/48:20 pmSEA - BHD
1 stop15h 15mBritish Airways
Wed 8/206:15 pmBHD - SEA
1 stop25h 20mBritish Airways
Deal found 6/12$717
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Tue 10/283:13 pmSEA - BHD
2 stops16h 42mAmerican Airlines
Tue 11/46:35 amBHD - SEA
1 stop12h 45mAmerican Airlines
Deal found 6/11$733
This Orbitz deal was found by Cheapflights users on 6/12. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/43:00 pmSEA - BHD
2 stops36h 30mIberia
Tue 10/146:35 amBHD - SEA
1 stop12h 35mIberia
Deal found 6/12$745
This American Airlines deal was found by Cheapflights users on 6/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/45:45 pmSEA - BHD
2 stops15h 45mMultiple Airlines
Wed 8/204:05 pmBHD - SEA
1 stop27h 30mMultiple Airlines
Deal found 6/12$769
This Trip.com deal was found by Cheapflights users on 6/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/47:00 pmSEA - BFS
2 stops20h 25mMultiple Airlines
Tue 10/147:55 pmBFS - SEA
2 stops32h 45mMultiple Airlines
Deal found 6/12$791
This Mytrip deal was found by Cheapflights users on 6/12. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/47:35 pmSEA - BHD
2 stops17h 15mAer Lingus
Wed 8/207:00 amBHD - SEA
2 stops18h 50mAer Lingus
Deal found 6/12$797

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 June 12, 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 - BHD

SEABHD

Seattle/Tacoma Intl

Mon 8/4

8:20 pm-7:35 pm

1 stop15h 15m

Belfast City

Wed 8/20

6:15 pm-11:35 am

1 stop25h 20m

$717

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 8/4

5:45 pm-5:30 pm

2 stops15h 45m

Belfast City

Wed 8/20

4:05 pm-11:35 am

1 stop27h 30m

$769

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 10/4

7:00 pm-11:25 pm

2 stops20h 25m

Belfast Intl

Tue 10/14

7:55 pm-8:40 pm

2 stops32h 45m

$791

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 8/4

7:35 pm-8:50 pm

2 stops17h 15m

Belfast City

Wed 8/20

7:00 am-5:50 pm

2 stops18h 50m

$797

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 9/9

8:05 am-10:35 am

2 stops18h 30m

Belfast City

Tue 9/16

4:25 pm-8:12 pm

2 stops35h 47m

$4,964

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

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 June 12, 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.

Rainfall in Northern Ireland by month

Plan your trip to Northern Ireland by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Northern Ireland ranges from 2.0 - 3.5 inches per month. October is typically the wettest month, when rainfall can reach 3.5 in. April is typically the driest time to visit Northern Ireland when rainfall is around 2.0 in.

Temperature in Northern Ireland by month

Plan your trip to Northern Ireland by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Northern Ireland, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 60.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 41.0 F).

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 June 12, 2025.
Aer Lingus
7.1
Good
1,117 reviews

Overall

7.1

Entertainment

6.8

Comfort

7.0

Food

6.4

Boarding

7.2

Crew

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - DUB

Most airlines board by group even though passengers are seated at the back. At Seatac, passengers were seated starting at the back. Otherwise, flight was good.
Aer Lingus
7.1
Good
1,117 reviews
Aer Lingus
7.1
Good
1,117 reviews

Overall

7.1

Entertainment

6.8

Comfort

7.0

Food

6.4

Boarding

7.2

Crew

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - DUB

Most airlines board by group even though passengers are seated at the back. At Seatac, passengers were seated starting at the back. Otherwise, flight was good.
Iberia
7.0
Good
2,776 reviews
Aer Lingus
7.1
Good
1,117 reviews

Overall

7.1

Entertainment

6.8

Comfort

7.0

Food

6.4

Boarding

7.2

Crew

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - DUB

Most airlines board by group even though passengers are seated at the back. At Seatac, passengers were seated starting at the back. Otherwise, flight was good.
British Airways
6.6
Okay
7,008 reviews
Aer Lingus
7.1
Good
1,117 reviews

Overall

7.1

Entertainment

6.8

Comfort

7.0

Food

6.4

Boarding

7.2

Crew

7.9

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2025

SEA - DUB

Most airlines board by group even though passengers are seated at the back. At Seatac, passengers were seated starting at the back. Otherwise, flight was good.

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.
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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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$519Average$891FlexibilityNo cancel feeOn-time70%

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