How long is the flight from Northern Ireland to Seattle?

For as low as £521, American Airlines can have you in Seattle from Northern Ireland in 13h 30m. Airlines will cover a distance of 4472 mi. Both multi-stop and direct flights can be found to your destination and back.

In terms of precipitation, rainfall in Seattle ranges from 18.0 - 168.0 inches per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit Seattle when rainfall is around 18.0 mm.

If weather is an important factor for your trip to Seattle, 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 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

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

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

What airport do you fly into for flights to Seattle from Northern Ireland?

Most people fly into Seattle/Tacoma Intl (SEA) if they book a flight to Seattle from Northern Ireland. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

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

Yes. In addition to deals on Northern Ireland to Seattle flights, Cheapflights offers holiday packages that include both flights and hotel.

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

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Northern Ireland to Seattle.

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

Yes. Cheapflights offers flight deals from Northern Ireland to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£521+ Flights from Northern Ireland to Seattle

Cheap flight deals from Northern Ireland to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from Northern Ireland to Seattle
Explore the most affordable flight options available from Northern Ireland to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 December 2025.

Wed 31/1211:25BHD - SEA

2 stops31h 34mMultiple Airlines

Wed 7/108:35SEA - BHD

2 stops17h 40mMultiple Airlines

Deal found 3/12£967

Wed 31/1209:15BHD - SEA

2 stops17h 14mBritish Airways

Wed 7/115:35SEA - BHD

2 stops14h 40mBritish Airways

Deal found 3/12£1,809

Best flights from Northern Ireland to Seattle
Discover carefully curated flight deals from Northern Ireland to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 December 2025.

Wed 28/111:25BHD - SEA

1 stop13h 30mAmerican Airlines

Sun 1/214:04SEA - BHD

2 stops36h 36mAmerican Airlines

Deal found 1/12£521

Wed 28/106:35BHD - SEA

1 stop18h 20mBritish Airways

Sun 1/218:50SEA - BHD

1 stop14h 00mBritish Airways

Deal found 1/12£549

Fri 27/318:30BFS - SEA

3 stops30h 30mMultiple Airlines

Wed 8/419:00SEA - BFS

3 stops17h 15mMultiple Airlines

Deal found 4/12£778

Wed 4/206:35BHD - SEA

1 stop18h 20mAmerican Airlines

Sun 8/214:04SEA - BHD

2 stops36h 36mAmerican Airlines

Deal found 1/12£521

Wed 4/211:25BHD - SEA

1 stop13h 30mBritish Airways

Sun 8/208:04SEA - BHD

2 stops21h 51mBritish Airways

Deal found 2/12£651

Fri 9/118:00BFS - SEA

1 stop28h 49mMultiple Airlines

Tue 13/118:25SEA - BFS

1 stop16h 25mMultiple Airlines

Deal found 4/12£1,098

Last-minute flights from Northern Ireland to Seattle
Discover last-minute flight deals from Northern Ireland to Seattle. Data last updated 5 December 2025 and is based on user searches.

Wed 31/1211:25BHD - SEA

2 stops31h 34mMultiple Airlines

Wed 7/108:35SEA - BHD

2 stops17h 40mMultiple Airlines

Deal found 3/12£967

Fri 9/111:30BHD - SEA

1 stop32h 00mAmerican Airlines

Tue 13/108:04SEA - BHD

2 stops22h 46mAmerican Airlines

Deal found 4/12£713

Fri 9/117:20BHD - SEA

2 stops37h 05mDelta

Tue 13/111:25SEA - BHD

2 stops21h 25mDelta

Deal found 4/12£743

Fri 9/110:00BFS - SEA

2 stops41h 17mMultiple Airlines

Tue 13/118:25SEA - BFS

1 stop16h 25mMultiple Airlines

Deal found 4/12£820

Fri 9/107:20BHD - SEA

2 stops19h 56mMultiple Airlines

Tue 13/108:10SEA - BHD

3 stops21h 25mMultiple Airlines

Deal found 4/12£963

Wed 28/106:35BHD - SEA

2 stops38h 39mAmerican Airlines

Sun 1/214:04SEA - BHD

2 stops36h 36mAmerican Airlines

Deal found 1/12£521

Wed 28/106:35BHD - SEA

1 stop18h 20mBritish Airways

Sun 1/218:50SEA - BHD

1 stop14h 00mBritish Airways

Deal found 1/12£549

Find flight deals from Northern Ireland to Seattle

Round-trip from	£625

British Airways
28/1-1/2
3 total stops
58h 31m total
Northern Ireland to Seattle

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 28/1

11:25-16:55

1 stop13h 30m

Seattle/Tacoma Intl

Sun 1/2

14:04-10:40

2 stops36h 36m

£521

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Sun 8/2

14:04-10:40

2 stops36h 36m

£521

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 28/1

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Sun 1/2

18:50-16:50

1 stop14h 00m

£549

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

11:25-16:55

1 stop13h 30m

Seattle/Tacoma Intl

Sun 8/2

08:04-13:55

2 stops21h 51m

£651

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 27/3

18:30-18:00

3 stops30h 30m

Seattle/Tacoma Intl

Wed 8/4

19:00-20:15

3 stops17h 15m

£778

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 9/1

18:00-14:49

1 stop28h 49m

Seattle/Tacoma Intl

Tue 13/1

18:25-18:50

1 stop16h 25m

£1,098

Flights are sorted by cheapest return flights first.

Deals found on 1/12

Best time to book a flight from Northern Ireland to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Northern Ireland 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 Northern Ireland to Seattle

No data available for this route at this time. Please check back soon.

Related info for your journey

What airport do you fly into for flights to Seattle from Northern Ireland?
Most people fly into Seattle/Tacoma Intl (SEA) if they book a flight to Seattle from Northern Ireland. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.
How long is the flight from Northern Ireland to Seattle?
For as low as £521, American Airlines can have you in Seattle from Northern Ireland in 13h 30m. Airlines will cover a distance of 4472 mi. Both multi-stop and direct flights can be found to your destination and back.
Can I find deals for flights from Northern Ireland to Seattle that include hotel bookings?
Yes. In addition to deals on Northern Ireland to Seattle flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Northern Ireland to Seattle?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Northern Ireland to Seattle.
Can I find deals for business class flights from Northern Ireland to Seattle?
Yes. Cheapflights offers flight deals from Northern Ireland to Seattle 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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Top 2 airlines flying from Northern Ireland to Seattle

Airline	Cheapest	Average	Flexibility	On-time
British Airways	Cheapest£441	Average£527	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
American Airlines	Cheapest£563	Average£563	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights

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

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Northern Ireland to Seattle. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

Cheapflights helps you find that perfect flight to Seattle from Northern Ireland by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

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

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

Yes! Start tracking prices for Northern Ireland to Seattle flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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Cheap flights from Northern Ireland to Seattle from £521

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

Cheap flight deals from Northern Ireland to Seattle

Cheapest flights from Northern Ireland to SeattleExplore the most affordable flight options available from Northern Ireland to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 December 2025.

Explore the most affordable flight options available from Northern Ireland to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 December 2025.

Find flight deals from Northern Ireland to Seattle

Keep the following information in mind while searching for Northern Ireland to Seattle flight deals. Data was last updated 5 December 2025.

Round-trip from

Cheapflights Fare Finder

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

Best time to book a flight from Northern Ireland to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Northern Ireland with our price prediction graph.

Cheapflights Insights

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

Related info for your journey

Find useful and relevant information for your journey from Northern Ireland to Seattle. 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 into for flights to Seattle from Northern Ireland?

How long is the flight from Northern Ireland to Seattle?

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

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

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

Travelling to a place near Seattle?

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 Northern Ireland to Seattle

See prices for flight routes from nearby airports that may be better suited for you.

Top 2 airlines flying from Northern Ireland to Seattle

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 Northern Ireland to Seattle?

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

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

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

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Cheapest flights from Northern Ireland to Seattle
Explore the most affordable flight options available from Northern Ireland to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 December 2025.