How long is the flight from Seattle to Northern Ireland?

British Airways 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.

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.

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).

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

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Northern Ireland as you normally would.

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.

£233+ Flights from Seattle to Northern Ireland

Cheap flight deals from Seattle to Northern Ireland

Enter your travel dates to find the best prices.

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 12 December 2025.

Fri 12/1211:34SEA - BHD

2 stops18h 41mBritish Airways

Fri 19/1206:45BHD - SEA

2 stops41h 54mBritish Airways

Deal found 11/12£910

Fri 12/1209:30SEA - BHD

2 stops23h 20mDelta

Fri 19/1206:30BHD - SEA

1 stop13h 20mDelta

Deal found 11/12£1,113

Fri 12/1215:05SEA - BHD

1 stop17h 45mKLM

Fri 19/1206:30BHD - SEA

1 stop13h 20mKLM

Deal found 11/12£1,152

Fri 12/1214:00SEA - BHD

2 stops22h 50mMultiple Airlines

Fri 19/1207:00BHD - SEA

3 stops23h 48mMultiple Airlines

Deal found 11/12£1,603

Best flights from Seattle to Northern Ireland
Discover carefully curated flight deals from Seattle to Northern Ireland that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 12 December 2025.

Sat 7/313:35SEA - BHD

1 stop16h 40mBritish Airways

Tue 17/306:35BHD - SEA

1 stop12h 55mBritish Airways

Deal found 10/12£450

Sun 25/114:35SEA - BFS

2 stops20h 20mMultiple Airlines

Sun 1/207:10BFS - SEA

2 stops17h 50mMultiple Airlines

Deal found 11/12£535

Sat 7/313:35SEA - BHD

1 stop16h 40mBritish Airways

Wed 18/312:25BHD - SEA

1 stop12h 30mBritish Airways

Deal found 10/12£450

Thu 19/207:15SEA - BHD

2 stops19h 05mBritish Airways

Thu 26/210:40BHD - SEA

1 stop14h 15mBritish Airways

Deal found 11/12£462

Sat 24/114:35SEA - BFS

2 stops19h 05mMultiple Airlines

Sat 31/108:10BFS - SEA

2 stops16h 50mMultiple Airlines

Deal found 10/12£561

Thu 19/214:35SEA - BFS

2 stops24h 00mMultiple Airlines

Thu 26/220:05BFS - SEA

2 stops25h 15mMultiple Airlines

Deal found 11/12£754

Last-minute flights from Seattle to Northern Ireland
Discover last-minute flight deals from Seattle to Northern Ireland. Data last updated 12 December 2025 and is based on user searches.

Fri 12/1211:34SEA - BHD

2 stops18h 41mBritish Airways

Fri 19/1206:45BHD - SEA

2 stops41h 54mBritish Airways

Deal found 11/12£910

Fri 12/1209:30SEA - BHD

2 stops23h 20mDelta

Fri 19/1206:30BHD - SEA

1 stop13h 20mDelta

Deal found 11/12£1,113

Fri 12/1215:05SEA - BHD

1 stop17h 45mKLM

Fri 19/1206:30BHD - SEA

1 stop13h 20mKLM

Deal found 11/12£1,152

Fri 12/1214:00SEA - BHD

2 stops22h 50mMultiple Airlines

Fri 19/1207:00BHD - SEA

3 stops23h 48mMultiple Airlines

Deal found 11/12£1,603

Sat 24/114:35SEA - BFS

2 stops19h 05mMultiple Airlines

Sat 31/108:10BFS - SEA

2 stops16h 50mMultiple Airlines

Deal found 10/12£561

Sun 25/114:35SEA - BFS

2 stops20h 20mMultiple Airlines

Sun 1/207:10BFS - SEA

2 stops17h 50mMultiple Airlines

Deal found 11/12£535

Fri 30/118:50SEA - BHD

1 stop16h 25mBritish Airways

Tue 3/210:00BHD - SEA

1 stop14h 55mBritish Airways

Deal found 9/12£466

One-way flights from Seattle to Northern Ireland
Search for one-way flight options from Seattle to Northern Ireland. Find affordable one-way fares based on user searches. Data last updated 12 December 2025.

Thu 15/114:35SEA - BFS

2 stops24h 00mMultiple Airlines

Deal found 11/12£233

Thu 15/114:35SEA - BHD

2 stops18h 50mMultiple Airlines

Deal found 11/12£250

Thu 15/118:50SEA - BHD

1 stop29h 35mBritish Airways

Deal found 11/12£308

Find flight deals from Seattle to Northern Ireland

Round-trip from	£450
One-way from	£233
Popular in	December
Cheapest in	April
Average price	£1,182

British Airways
7/3-17/3
2 total stops
35h 00m total
Seattle to Northern Ireland

Search Deals

15/1
2 total stops
24h 00m total
Seattle to Northern Ireland

Search Deals

Highest demand for flights based on searches. 11% potential increase in price (£71 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 6% potential price decrease (£34 potential savings vs. average return price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to Northern Ireland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

13:35-14:15

1 stop16h 40m

Belfast City

Tue 17/3

06:35-12:30

1 stop12h 55m

£450

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

13:35-14:15

1 stop16h 40m

Belfast City

Wed 18/3

12:25-17:55

1 stop12h 30m

£450

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 19/2

07:15-10:20

2 stops19h 05m

Belfast City

Thu 26/2

10:40-16:55

1 stop14h 15m

£462

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 25/1

14:35-18:55

2 stops20h 20m

Belfast Intl

Sun 1/2

07:10-17:00

2 stops17h 50m

£535

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 24/1

14:35-17:40

2 stops19h 05m

Belfast Intl

Sat 31/1

08:10-17:00

2 stops16h 50m

£561

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 19/2

14:35-22:35

2 stops24h 00m

Belfast Intl

Thu 26/2

20:05-13:20

2 stops25h 15m

£754

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 15/1

14:35-22:35

2 stops24h 00m

£233

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 15/1

14:35-17:25

2 stops18h 50m

£250

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 15/1

18:50-08:25

1 stop29h 35m

£308

Flights are sorted by cheapest return flights first.

Deals found on 11/12

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 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

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?
British Airways 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Seattle to Northern Ireland

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 Stansted flights

Seattle to Glasgow Intl flights

Portland to Glasgow Intl flights

Portland to Edinburgh flights

Portland to Luton flights

Portland to Manchester flights

Spokane to Heathrow flights

Spokane to Gatwick flights

Seattle to Manchester flights

Seattle to Newcastle upon Tyne flights

Seattle to Belfast City flights

Spokane to Manchester flights

Portland to Bristol flights

Spokane to Glasgow Intl flights

Spokane to Edinburgh flights

Seattle to Inverness flights

Seattle to Birmingham flights

Seattle to Bristol flights

Seattle to Leeds flights

Portland to Belfast City flights

Portland to Aberdeen flights

Portland to Leeds flights

Portland to Belfast Intl flights

Seattle to Aberdeen flights

Bellingham to Gatwick flights

Portland to Southend flights

Seattle to Liverpool flights

Spokane to Southampton flights

Direct flights to United Kingdom

Fly with Cheapflights

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.

Cheap flights from Seattle to Northern Ireland from £233

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 15/1. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Seattle to Northern Ireland

Cheapest flights from Seattle to Northern IrelandExplore 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 12 December 2025.

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 12 December 2025.

Find 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 12 December 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from Seattle to Northern Ireland that are best for you.

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.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Northern Ireland

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?

How long is the flight from Seattle to Northern Ireland?

Can I find deals for flights from Seattle to Northern Ireland that include hotel bookings?

How can I find direct flights from Seattle to Northern Ireland?

Can I find deals for business class flights from Seattle to Northern Ireland?

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.

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?

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

Can Cheapflights 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?

100% Free

Book with Flexibility

Travel Smart

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 12 December 2025.