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Cheap flights from Northern Ireland to Seattle from £378

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 26/4. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — SEA
2 Apr — 9 Apr1
1 adult

Cheap 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 28 March 2025.

Round-trip from

£596

One-way from

£378
British Airways
  • British Airways
  • 8/5-22/5
  • 2 total stops
  • 32h 30m total
  • Northern Ireland to Seattle
Search Deals
26/4
  • 26/4
  • 3 total stops
  • 51h 05m total
  • Northern Ireland to Seattle
Search Deals

Find flight deals from Northern Ireland to Seattle

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 28 March 2025.

Thu 8/509:35BHD - SEA
1 stop16h 45mBritish Airways
Thu 22/513:30SEA - BHD
1 stop15h 45mBritish Airways
Deal found 27/3£596
Thu 8/506:30BHD - SEA
2 stops18h 14mDelta
Thu 22/514:10SEA - BHD
1 stop18h 45mDelta
Deal found 27/3£605
Thu 8/506:35BHD - SEA
2 stops17h 25mAmerican Airlines
Thu 29/520:20SEA - BHD
1 stop15h 00mAmerican Airlines
Deal found 27/3£634
Thu 8/506:30BHD - SEA
2 stops18h 14mKLM
Thu 29/518:35SEA - BHD
2 stops18h 40mKLM
Deal found 27/3£660
Fri 9/506:30BHD - SEA
2 stops18h 06mMultiple Airlines
Fri 30/518:07SEA - BHD
1 stop14h 48mMultiple Airlines
Deal found 27/3£667

Cheapflights Fare Finder

Customise your flight search to find flights from Northern Ireland to Seattle 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 28 March 2025.
Use the filters below to find and compare flights from Northern Ireland to Seattle that are best for you.

Fly from

Northern Ireland

Fly to

Seattle

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 8/5

09:35-18:20

1 stop16h 45m

Seattle/Tacoma Intl

Thu 22/5

13:30-13:15

1 stop15h 45m

£596

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 8/5

06:30-16:44

2 stops18h 14m

Seattle/Tacoma Intl

Thu 22/5

14:10-16:55

1 stop18h 45m

£605

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 8/5

06:35-16:00

2 stops17h 25m

Seattle/Tacoma Intl

Thu 29/5

20:20-19:20

1 stop15h 00m

£634

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 8/5

06:30-16:44

2 stops18h 14m

Seattle/Tacoma Intl

Thu 29/5

18:35-21:15

2 stops18h 40m

£660

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Fri 9/5

06:30-16:36

2 stops18h 06m

Seattle/Tacoma Intl

Fri 30/5

18:07-16:55

1 stop14h 48m

£667

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 26/4

16:30-11:35

3 stops51h 05m

£378

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 26/4

07:00-00:44

3 stops49h 44m

£390

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 26/4

07:05-11:35

1 stop12h 30m

£685

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 30/7

10:00-18:20

1 stop16h 20m

£1,038

Flights are sorted by cheapest return flights first.

Deals found on 27/3

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

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

Find hourly flight availability from Northern Ireland to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 28 March 2025.

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.

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

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.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

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).

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated 28 March 2025.
Delta
8.0
Very Good
7,896 reviews
Check prices

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very Good
7,896 reviews
Delta
8.0
Very Good
7,896 reviews
Check prices

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,321 reviews
Delta
8.0
Very Good
7,896 reviews
Check prices

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very Good
7,896 reviews
Check prices

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Aer Lingus
7.0
Good
1,062 reviews
Delta
8.0
Very Good
7,896 reviews
Check prices

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
British Airways
6.6
Okay
6,712 reviews
Delta
8.0
Very Good
7,896 reviews
Check prices

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Food

7.3

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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?

    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.

  • What is the cheapest month to book a flight from Northern Ireland to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Northern Ireland to Seattle (average of £622). Flying from Northern Ireland to Seattle in July is currently the most expensive (average of £946). 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

Travelling to a place near Northern Ireland?

Book flights to Northern Ireland if you plan to visit one of these locations
Tacoma
Leavenworth
Bothell

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Alternative routes for Northern Ireland to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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Top airline flying from Northern Ireland to Seattle

Discover the top airline that operate flights from Northern Ireland to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 28 March 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£458Average£557FlexibilityNo cancel feeOn-time70%
Search British Airways 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 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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