HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Northern Ireland

$314+ 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 7/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
May 6 — May 131
Tue 5/6
Tue 5/13
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 May 1, 2025.

Round-trip from

$788
(Mytrip)

One-way from

$314
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$876
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. 18% potential increase in price ($209 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($51 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2025
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 May 1, 2025.

This American Airlines deal was found by Cheapflights users on 4/30. 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 10/282:35 pmSEA - BHD
1 stop12h 55mAmerican Airlines
Tue 11/46:35 amBHD - SEA
1 stop12h 45mAmerican Airlines
Deal found 4/30$685
This Cheapflightsfares deal was found by Cheapflights users on 4/29. 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.
Tue 10/287:50 pmSEA - BHD
1 stop15h 50mBritish Airways
Tue 11/46:35 amBHD - SEA
1 stop12h 45mBritish Airways
Deal found 4/29$763
This Mytrip deal was found by Cheapflights users on 4/30. 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.
Tue 6/103:45 pmSEA - BFS
2 stops15h 15mMultiple Airlines
Tue 6/179:00 amBFS - SEA
2 stops16h 50mMultiple Airlines
Deal found 4/30$788
This Delta deal was found by Cheapflights users on 4/29. 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.
Sun 5/41:55 pmSEA - BHD
1 stop23h 20mDelta
Mon 5/125:25 pmBHD - SEA
1 stop26h 15mDelta
Deal found 4/29$887
This KLM deal was found by Cheapflights users on 4/30. 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.
Thu 5/12:10 pmSEA - BHD
1 stop18h 45mKLM
Sat 5/105:25 pmBHD - SEA
1 stop30h 32mKLM
Deal found 4/30$988
This Cheapflightsfares deal was found by Cheapflights users on 4/28. 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.
Tue 6/37:35 pmSEA - BHD
2 stops15h 50mAer Lingus
Tue 6/107:00 amBHD - SEA
2 stops18h 50mAer Lingus
Deal found 4/28$1,010
This Mytrip deal was found by Cheapflights users on 4/29. 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 6/1610:00 amSEA - BHD
3 stops27h 10mMultiple Airlines
Thu 6/197:05 amBHD - SEA
3 stops39h 58mMultiple Airlines
Deal found 4/29$1,070

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 May 1, 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

Tue 6/10

3:45 pm-3:00 pm

2 stops15h 15m

Belfast Intl

Tue 6/17

9:00 am-5:50 pm

2 stops16h 50m

$788

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 6/3

7:35 pm-7:25 pm

2 stops15h 50m

Belfast City

Tue 6/10

7:00 am-5:50 pm

2 stops18h 50m

$1,010

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 6/16

10:00 am-9:10 pm

3 stops27h 10m

Belfast City

Thu 6/19

7:05 am-3:03 pm

3 stops39h 58m

$1,070

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 6/3

8:20 pm-7:25 pm

1 stop15h 05m

Belfast City

Tue 6/10

6:35 am-11:10 am

1 stop12h 35m

$1,116

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 6/14

5:35 pm-4:55 pm

1 stop15h 20m

Belfast City

Sat 6/21

5:25 pm-3:55 pm

1 stop30h 30m

$1,482

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Fri 7/4

3:45 pm-6:35 pm

3 stops42h 50m

$314

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 7/3

3:45 pm-4:25 pm

2 stops16h 40m

$447

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 7/3

1:30 pm-11:10 am

1 stop13h 40m

$792

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

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 May 1, 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 May 1, 2025.
KLM
7.8
Good
1,334 reviews

Overall

7.8

Boarding

7.8

Food

7.2

Crew

8.4

Comfort

7.7

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
KLM
7.8
Good
1,334 reviews
KLM
7.8
Good
1,334 reviews

Overall

7.8

Boarding

7.8

Food

7.2

Crew

8.4

Comfort

7.7

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
Aer Lingus
7.0
Good
1,076 reviews
KLM
7.8
Good
1,334 reviews

Overall

7.8

Boarding

7.8

Food

7.2

Crew

8.4

Comfort

7.7

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
British Airways
6.6
Okay
6,842 reviews
KLM
7.8
Good
1,334 reviews

Overall

7.8

Boarding

7.8

Food

7.2

Crew

8.4

Comfort

7.7

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.

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

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
Portland to Gatwick flights
Seattle to Edinburgh flights
Portland to London City flights
Seattle to Stansted flights
Seattle to Glasgow Intl flights
Seattle to Luton flights
Seattle to Manchester flights
Portland to Edinburgh flights
Portland to Glasgow Intl flights
Spokane to Heathrow flights
Seattle to Inverness flights
Spokane to Edinburgh flights
Portland to Manchester flights
Seattle to Aberdeen flights
Seattle to Southampton flights
Seattle to Belfast Intl flights
Seattle to Birmingham flights
Seattle to Liverpool flights
Portland to Stansted flights
Spokane to Glasgow Intl flights
Spokane to Gatwick flights
Pasco to Heathrow flights
Seattle to Bristol flights
Seattle to Belfast City flights
Seattle to Newcastle upon Tyne flights
Spokane to London City flights
Seattle to Leeds flights
Portland to Inverness flights
Portland to Luton flights
Seattle to Cardiff flights
Portland to Aberdeen flights
Bellingham to Heathrow flights
Seattle to Newquay flights
Seattle to Darlington flights
Portland to Bristol flights
Portland to Belfast Intl flights
Spokane to Manchester flights
Portland to Belfast City flights
Seattle to Southend flights
Walla Walla to Heathrow flights
Seattle to Grimsby flights
Spokane to Southampton flights
Bellingham to Gatwick flights
Portland to Leeds flights
Portland to Sumburgh/Shetland flights

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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$544Average$891FlexibilityNo cancel feeOn-time70%

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.