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Cheap flights from Seattle to Northern Ireland from £511

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 28/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
5 May — 12 May1
1 adult

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 30 April 2025.

Round-trip from

£629

Popular in

June

Cheapest in

October

Average price

£585
11/6-18/6
  • 11/6-18/6
  • 5 total stops
  • 64h 41m total
  • Seattle to Northern Ireland
Search Deals
Highest demand for flights based on searches. 18% potential increase in price (£116 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£29 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 30 April 2025.

Tue 28/1014:35SEA - BHD
1 stop12h 55mAmerican Airlines
Tue 4/1106:35BHD - SEA
1 stop12h 45mAmerican Airlines
Deal found 30/4£511
Tue 28/1019:50SEA - BHD
1 stop15h 50mBritish Airways
Tue 4/1106:35BHD - SEA
1 stop12h 45mBritish Airways
Deal found 29/4£569
Wed 11/607:05SEA - BFS
2 stops27h 30mMultiple Airlines
Wed 18/617:05BFS - SEA
3 stops37h 11mMultiple Airlines
Deal found 29/4£629
Sun 4/513:55SEA - BHD
1 stop23h 20mDelta
Mon 12/517:25BHD - SEA
1 stop26h 15mDelta
Deal found 29/4£661
Thu 1/514:10SEA - BHD
1 stop18h 45mKLM
Sun 11/506:30BHD - SEA
1 stop17h 27mKLM
Deal found 30/4£737
Tue 3/619:35SEA - BHD
2 stops15h 50mAer Lingus
Tue 10/607:00BHD - SEA
2 stops18h 50mAer Lingus
Deal found 28/4£753
Mon 16/610:00SEA - BHD
3 stops27h 10mMultiple Airlines
Thu 19/607:05BHD - SEA
3 stops39h 58mMultiple Airlines
Deal found 29/4£798

Cheapflights Fare Finder

Customise 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 858,174 searches. Data last updated 30 April 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

Wed 11/6

07:05-18:35

2 stops27h 30m

Belfast Intl

Wed 18/6

17:05-22:16

3 stops37h 11m

£629

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 3/6

19:35-19:25

2 stops15h 50m

Belfast City

Tue 10/6

07:00-17:50

2 stops18h 50m

£753

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 16/6

10:00-21:10

3 stops27h 10m

Belfast City

Thu 19/6

07:05-15:03

3 stops39h 58m

£798

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 3/6

20:20-19:25

1 stop15h 05m

Belfast City

Tue 10/6

06:35-11:10

1 stop12h 35m

£832

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 29/6

13:55-16:55

1 stop19h 00m

Belfast City

Thu 10/7

17:25-11:35

1 stop26h 10m

£2,800

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 28/8

17:05-20:45

2 stops43h 40m

£722

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 28/8

20:20-18:45

1 stop14h 25m

£965

Flights are sorted by cheapest return flights first.

Deals found on 29/4

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 return 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

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 50.0 - 90.0 inches per month. October is typically the wettest month, when rainfall can reach 90.0 mm. April is typically the driest time to visit Northern Ireland when rainfall is around 50.0 mm.

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 16.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 5.0 C).

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 30 April 2025.
KLM
7.8
Good
1,334 reviews
Check prices

Comfort

7.7

Boarding

7.8

Overall

7.8

Crew

8.4

Entertainment

7.1

Food

7.2

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
Check prices

Comfort

7.7

Boarding

7.8

Overall

7.8

Crew

8.4

Entertainment

7.1

Food

7.2

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
Check prices

Comfort

7.7

Boarding

7.8

Overall

7.8

Crew

8.4

Entertainment

7.1

Food

7.2

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
Check prices

Comfort

7.7

Boarding

7.8

Overall

7.8

Crew

8.4

Entertainment

7.1

Food

7.2

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?

    Located just 11.4 mi from the city center, Seattle/Tacoma Intl (SEA) is the airport most travelers will use when flying to Northern Ireland from Seattle.

  • 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 holiday 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, January is the cheapest month in which you can book a flight from Seattle to Northern Ireland (average of £67). Flying from Seattle to Northern Ireland in July is currently the most expensive (average of £90). 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

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How does Cheapflights help users find flights from Seattle to Northern Ireland?

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Why should you use Cheapflights to find cheap flight tickets from Seattle to Northern Ireland?

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Not ready to book yet? You can track prices for flights from Seattle to Northern Ireland on Cheapflights with our Price Alert feature and get notified when better prices are available.

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