How long is the flight from Seattle to Northern Ireland?

British Airways and Delta can get you from Seattle to Northern Ireland in just under 21h 55m. Your travel time can differ by up to 6h 45m. There are 4472 mi between Seattle and Northern Ireland. This flight may include one or multiple stops.

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.

£505+ Cheap Flights from Seattle to Northern Ireland

Find 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 24 October 2025.

Wed 3/1218:50SEA - BHD

1 stop28h 40mBritish Airways

Sun 7/1220:25BHD - SEA

1 stop28h 30mBritish Airways

Deal found 23/10£505

Wed 3/1215:05SEA - BHD

1 stop21h 55mDelta

Sun 7/1206:30BHD - SEA

1 stop13h 20mDelta

Deal found 22/10£514

Sat 6/1214:35SEA - BFS

2 stops16h 50mMultiple Airlines

Sat 13/1208:10BFS - SEA

2 stops16h 50mMultiple Airlines

Deal found 22/10£673

Wed 29/1019:50SEA - BHD

1 stop28h 40mBritish Airways

Wed 5/1119:25BHD - SEA

1 stop29h 30mBritish Airways

Deal found 23/10£767

Sun 26/1008:15SEA - BFS

3 stops30h 15mMultiple Airlines

Wed 29/1014:45BFS - SEA

2 stops32h 55mMultiple Airlines

Deal found 23/10£1,170

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 24 October 2025.

Wed 3/1218:50SEA - BHD

1 stop28h 40mBritish Airways

Sun 7/1220:25BHD - SEA

1 stop28h 30mBritish Airways

Deal found 23/10£505

Wed 3/1215:05SEA - BHD

1 stop21h 55mDelta

Sun 7/1206:30BHD - SEA

1 stop13h 20mDelta

Deal found 22/10£514

Tue 7/414:05SEA - BHD

1 stop18h 50mKLM

Thu 16/406:30BHD - SEA

1 stop13h 05mKLM

Deal found 22/10£571

Sat 6/1214:35SEA - BFS

2 stops16h 50mMultiple Airlines

Sat 13/1208:10BFS - SEA

2 stops16h 50mMultiple Airlines

Deal found 22/10£673

Tue 7/411:51SEA - BHD

2 stops17h 09mBritish Airways

Thu 16/406:35BHD - SEA

1 stop13h 00mBritish Airways

Deal found 22/10£559

Sat 7/313:35SEA - BHD

1 stop16h 40mBritish Airways

Wed 18/309:15BHD - SEA

1 stop15h 40mBritish Airways

Deal found 23/10£571

Sat 7/318:50SEA - BHD

1 stop13h 55mBritish Airways

Tue 17/308:45BHD - SEA

1 stop16h 10mBritish Airways

Deal found 22/10£572

Tue 7/415:45SEA - BFS

2 stops20h 50mMultiple Airlines

Thu 16/422:00BFS - SEA

3 stops30h 45mMultiple Airlines

Deal found 22/10£874

Last-minute flights from Seattle to Northern Ireland
Discover last-minute flight deals from Seattle to Northern Ireland. Data last updated 24 October 2025 and is based on user searches.

Sun 26/1008:15SEA - BFS

3 stops30h 15mMultiple Airlines

Wed 29/1014:45BFS - SEA

2 stops32h 55mMultiple Airlines

Deal found 23/10£1,170

Wed 29/1019:50SEA - BHD

1 stop28h 40mBritish Airways

Wed 5/1119:25BHD - SEA

1 stop29h 30mBritish Airways

Deal found 23/10£767

Cheap flight deals from Seattle to Northern Ireland

Round-trip from	£505
Popular in	December
Cheapest in	March
Average price	£582

British Airways
3/12-7/12
2 total stops
57h 10m total
Seattle to Northern Ireland

Search Deals

Highest demand for flights based on searches. 9% potential increase in price (£53 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£20 potential savings vs. average return price).

Search Deals

Average for round-trip flights in October 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

Wed 3/12

18:50-07:30

1 stop28h 40m

Belfast City

Sun 7/12

20:25-16:55

1 stop28h 30m

£505

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 3/12

15:05-21:00

1 stop21h 55m

Belfast City

Sun 7/12

06:30-11:50

1 stop13h 20m

£514

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 7/4

11:51-13:00

2 stops17h 09m

Belfast City

Thu 16/4

06:35-11:35

1 stop13h 00m

£559

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 7/4

14:05-16:55

1 stop18h 50m

Belfast City

Thu 16/4

06:30-11:35

1 stop13h 05m

£571

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

13:35-14:15

1 stop16h 40m

Belfast City

Wed 18/3

09:15-17:55

1 stop15h 40m

£571

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

18:50-16:45

1 stop13h 55m

Belfast City

Tue 17/3

08:45-17:55

1 stop16h 10m

£572

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 6/12

14:35-15:25

2 stops16h 50m

Belfast Intl

Sat 13/12

08:10-17:00

2 stops16h 50m

£673

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 7/4

15:45-20:35

2 stops20h 50m

Belfast Intl

Thu 16/4

22:00-20:45

3 stops30h 45m

£874

Flights are sorted by cheapest return flights first.

Deals found on 23/10

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 and Delta can get you from Seattle to Northern Ireland in just under 21h 55m. Your travel time can differ by up to 6h 45m. There are 4472 mi between Seattle and Northern Ireland. This flight may include one or multiple stops.
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

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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.

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Cheap flights from Seattle to Northern Ireland from £505

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/12. Fares are subject to change and may not be available on all flights or dates of travel.

Find 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 24 October 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 24 October 2025.

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 24 October 2025.

Round-trip 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

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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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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?

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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 24 October 2025.