Find flights
When to book
FAQs

Cheap flights from Seattle to Northern Ireland from £449

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 13/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
17 Oct — 24 Oct1
1 adult
1 adult, Economy

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 17 September 2025.

Round-trip from

£449

Popular in

December

Cheapest in

March

Average price

£722
13/10-20/10
  • 13/10-20/10
  • 4 total stops
  • 39h 45m total
  • Seattle to Northern Ireland
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£38 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£16 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 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 17 September 2025.

Mon 13/1015:45SEA - BHD
2 stops17h 45mMultiple Airlines
Mon 20/1006:40BHD - SEA
2 stops22h 00mMultiple Airlines
Deal found 15/9£449
Mon 13/1020:20SEA - BHD
1 stop16h 25mAmerican Airlines
Mon 20/1013:50BHD - SEA
1 stop29h 20mAmerican Airlines
Deal found 15/9£477
Mon 13/1015:45SEA - BFS
2 stops20h 40mMultiple Airlines
Mon 20/1006:10BFS - SEA
2 stops22h 30mMultiple Airlines
Deal found 15/9£530
Wed 3/1218:50SEA - BHD
1 stop13h 45mBritish Airways
Sun 7/1220:25BHD - SEA
1 stop28h 30mBritish Airways
Deal found 14/9£545
Fri 3/1015:00SEA - BHD
2 stops19h 15mAmerican Airlines
Fri 10/1011:55BHD - SEA
2 stops19h 01mAmerican Airlines
Deal found 15/9£555
Fri 3/1017:40SEA - BHD
1 stop19h 35mDelta
Fri 10/1006:30BHD - SEA
1 stop17h 35mDelta
Deal found 15/9£571
Wed 3/1207:20SEA - BHD
2 stops29h 40mDelta
Sun 7/1206:30BHD - SEA
2 stops23h 51mDelta
Deal found 16/9£582
Wed 29/1021:05SEA - BHD
2 stops16h 50mBritish Airways
Wed 5/1117:40BHD - SEA
1 stop31h 15mBritish Airways
Deal found 15/9£676
Fri 31/1015:00SEA - BFS
2 stops17h 10mMultiple Airlines
Fri 7/1107:50BFS - SEA
3 stops41h 15mMultiple Airlines
Deal found 16/9£856

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 17 September 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

Sat 7/3

13:35-14:15

1 stop16h 40m

Belfast City

Wed 18/3

11:25-17:55

1 stop13h 30m

£515

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

13:35-14:15

1 stop16h 40m

Belfast City

Tue 17/3

11:25-17:55

1 stop13h 30m

£515

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

13:35-14:15

1 stop16h 40m

Belfast City

Tue 17/3

11:25-00:49

2 stops20h 24m

£524

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

13:35-14:15

1 stop16h 40m

Belfast City

Wed 18/3

11:25-00:49

2 stops20h 24m

£525

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 13/10

15:45-20:25

2 stops20h 40m

Belfast Intl

Mon 20/10

06:10-20:40

2 stops22h 30m

£530

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Fri 31/10

15:00-15:10

2 stops17h 10m

Belfast Intl

Fri 7/11

07:50-17:05

3 stops41h 15m

£856

Flights are sorted by cheapest return flights first.

Deals found on 15/9

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
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?

    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.

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

    Finnair can get you from Seattle to Northern Ireland in just under 16h 40m. Your travel time can differ by up to . There are 4472 mi between Seattle and 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 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

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
Seattle to Glasgow Intl flights
Seattle to Bristol flights
Seattle to Manchester flights
Portland to Edinburgh flights
Spokane to Heathrow flights
Portland to Luton flights
Portland to Manchester flights
Portland to Stansted flights
Spokane to Gatwick flights
Portland to Glasgow Intl flights
Seattle to Birmingham flights
Spokane to Manchester flights
Seattle to Inverness flights
Seattle to Newcastle upon Tyne flights
Seattle to Liverpool flights
Spokane to Glasgow Intl flights
Portland to Belfast Intl flights
Portland to Leeds flights
Seattle to Leeds flights
Portland to Aberdeen flights
Portland to Belfast City flights
Portland to Bristol flights
Spokane to Southampton flights
Seattle to Aberdeen flights
Portland to Southend flights
Spokane to Edinburgh flights
Bellingham to Gatwick flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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

Deals for Seattle to Northern Ireland flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

Cheapflights simply makes it quick and affordable to book flights from Seattle to Northern Ireland by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Seattle to Northern Ireland with no change fees?

Yes! Cheapflights helps users easily find flights from Seattle to Northern Ireland with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Northern Ireland become cheaper?

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.

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.