What are the cheapest airlines to fly from Seattle to Northern Ireland one-way?

To fly one-way, consider booking your trip with British Airways, which is currently one of the cheapest options available, starting at £369. Aer Lingus flights start at £384 while deals on American Airlines start at £413 one-way.

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.

What is the cheapest month to fly from Seattle to Northern Ireland?

The best pricing can be found in the month of October. Prices to Northern Ireland from Seattle average £714. You can even find prices in October for less than £714, as users have found deals to Northern Ireland from as low as £412. The month of June appears to be one of the more expensive times to travel to Northern Ireland from Seattle. Flying in the targeted month can save you up to 53%.

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.

£210+ Flights from Seattle to Northern Ireland

Cheap flight deals from Seattle to Northern Ireland

Round-trip from	£529
One-way from	£210
Popular in	June
Cheapest in	October
Average price	£593

12/5-16/5
4 total stops
42h 15m total
Seattle to Northern Ireland

Search Deals

24/7
2 total stops
35h 10m total
Seattle to Northern Ireland

Search Deals

Highest demand for flights based on searches. 17% potential increase in price (£112 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease (£30 potential savings vs. average return price).

Search Deals

Average for round-trip flights in April 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 18 April 2025.

Mon 12/515:45SEA - BFS

2 stops21h 10mMultiple Airlines

Fri 16/507:35BFS - SEA

2 stops21h 05mMultiple Airlines

Deal found 17/4£529

Mon 1/920:20SEA - BHD

1 stop13h 10mBritish Airways

Mon 15/919:30BHD - SEA

1 stop23h 40mBritish Airways

Deal found 17/4£575

Tue 28/1015:13SEA - BHD

2 stops16h 42mAmerican Airlines

Tue 4/1111:30BHD - SEA

1 stop13h 25mAmerican Airlines

Deal found 17/4£579

Fri 17/1015:45SEA - BHD

2 stops18h 30mMultiple Airlines

Sun 2/1105:30BHD - SEA

2 stops18h 30mMultiple Airlines

Deal found 17/4£591

Sat 3/518:07SEA - BHD

1 stop19h 08mDelta

Mon 12/517:25BHD - SEA

2 stops37h 52mDelta

Deal found 18/4£714

Mon 2/619:35SEA - BHD

2 stops17h 35mAer Lingus

Mon 9/606:55BHD - SEA

2 stops18h 55mAer Lingus

Deal found 18/4£746

Sat 3/518:07SEA - BHD

1 stop14h 48mKLM

Sun 11/506:30BHD - SEA

2 stops17h 38mKLM

Deal found 18/4£752

Wed 30/413:30SEA - BHD

1 stop14h 25mIberia

Sun 11/506:50BHD - SEA

2 stops24h 19mIberia

Deal found 17/4£859

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 18 April 2025.

Mon 12/515:45SEA - BFS

2 stops21h 10mMultiple Airlines

Fri 16/507:35BFS - SEA

2 stops21h 05mMultiple Airlines

Deal found 17/4£529

Mon 1/920:20SEA - BHD

1 stop13h 10mBritish Airways

Mon 15/919:30BHD - SEA

1 stop23h 40mBritish Airways

Deal found 17/4£575

Sat 3/518:07SEA - BHD

1 stop19h 08mDelta

Mon 12/517:25BHD - SEA

2 stops37h 52mDelta

Deal found 18/4£714

Fri 2/520:20SEA - BHD

1 stop16h 25mAmerican Airlines

Sun 11/506:50BHD - SEA

1 stop12h 40mAmerican Airlines

Deal found 18/4£717

Mon 2/619:35SEA - BHD

2 stops17h 35mAer Lingus

Mon 9/606:55BHD - SEA

2 stops18h 55mAer Lingus

Deal found 18/4£746

Sat 3/518:07SEA - BHD

1 stop19h 08mKLM

Sat 10/506:30BHD - SEA

2 stops17h 38mKLM

Deal found 18/4£752

Wed 30/413:30SEA - BHD

1 stop14h 25mIberia

Sun 11/506:50BHD - SEA

2 stops24h 19mIberia

Deal found 17/4£859

Mon 1/915:45SEA - BHD

2 stops19h 50mMultiple Airlines

Mon 15/915:25BHD - SEA

2 stops37h 15mMultiple Airlines

Deal found 17/4£603

Last-minute flights from Seattle to Northern Ireland
Discover last-minute flight deals from Seattle to Northern Ireland. Data last updated 18 April 2025 and is based on user searches.

Sun 20/410:25SEA - BHD

3 stops26h 00mMultiple Airlines

Sun 27/418:45BHD - SEA

2 stops31h 05mMultiple Airlines

Deal found 17/4£1,132

Wed 30/413:30SEA - BHD

1 stop14h 25mIberia

Sun 11/506:50BHD - SEA

2 stops24h 19mIberia

Deal found 17/4£859

Thu 1/518:45SEA - BHD

2 stops18h 25mAer Lingus

Mon 12/518:00BHD - SEA

2 stops30h 59mAer Lingus

Deal found 17/4£836

Fri 2/520:20SEA - BHD

1 stop13h 55mBritish Airways

Sun 11/506:50BHD - SEA

1 stop12h 40mBritish Airways

Deal found 17/4£627

Fri 2/520:20SEA - BHD

1 stop16h 25mAmerican Airlines

Sun 11/506:50BHD - SEA

1 stop12h 40mAmerican Airlines

Deal found 18/4£717

Sat 3/518:07SEA - BHD

1 stop19h 08mDelta

Mon 12/517:25BHD - SEA

2 stops37h 52mDelta

Deal found 18/4£714

Sat 3/518:07SEA - BHD

1 stop19h 08mKLM

Sat 10/506:30BHD - SEA

2 stops17h 38mKLM

Deal found 18/4£752

Mon 12/515:45SEA - BFS

2 stops21h 10mMultiple Airlines

Fri 16/507:35BFS - SEA

2 stops21h 05mMultiple Airlines

Deal found 17/4£529

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 18 April 2025.

Thu 24/715:45SEA - BFS

2 stops35h 10mMultiple Airlines

Deal found 16/4£210

Fri 25/723:30SEA - BHD

2 stops49h 05mMultiple Airlines

Deal found 16/4£236

Tue 13/520:20SEA - BHD

1 stop13h 10mBritish Airways

Deal found 17/4£369

Thu 24/418:45SEA - BHD

2 stops14h 55mAer Lingus

Deal found 17/4£384

Thu 24/413:30SEA - BHD

1 stop13h 40mAmerican Airlines

Deal found 17/4£413

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 - BFS

SEABFS

Seattle/Tacoma Intl

Mon 12/5

15:45-20:55

2 stops21h 10m

Belfast Intl

Fri 16/5

07:35-20:40

2 stops21h 05m

£529

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 1/9

20:20-17:30

1 stop13h 10m

Belfast City

Mon 15/9

19:30-11:10

1 stop23h 40m

£575

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 1/9

15:45-19:35

2 stops19h 50m

Belfast City

Mon 15/9

15:25-20:40

2 stops37h 15m

£603

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/5

18:07-21:15

1 stop19h 08m

Belfast City

Mon 12/5

17:25-23:17

2 stops37h 52m

£714

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 2/5

20:20-20:45

1 stop16h 25m

Belfast City

Sun 11/5

06:50-11:30

1 stop12h 40m

£717

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 2/6

19:35-21:10

2 stops17h 35m

Belfast City

Mon 9/6

06:55-17:50

2 stops18h 55m

£746

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/5

18:07-21:15

1 stop19h 08m

Belfast City

Sat 10/5

06:30-16:08

2 stops17h 38m

£752

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 30/4

13:30-11:55

1 stop14h 25m

Belfast City

Sun 11/5

06:50-23:09

2 stops24h 19m

£859

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 24/7

15:45-10:55

2 stops35h 10m

£210

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 25/7

23:30-08:35

2 stops49h 05m

£236

Flights are sorted by cheapest return flights first.

Deals found on 16/4

Showing 1-10 of 13 results

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

Rainfall in Northern Ireland by month

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.

Temperature in Northern Ireland by month

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).

Reviews of airlines servicing Northern Ireland

Delta

8.0

Very Good

7,917 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta

8.0

Very Good

7,917 reviews

Delta

8.0

Very Good

7,917 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM

7.8

Good

1,329 reviews

Delta

8.0

Very Good

7,917 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

American Airlines

7.2

Good

10,000 reviews

Delta

8.0

Very Good

7,917 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Aer Lingus

7.0

Good

1,063 reviews

Delta

8.0

Very Good

7,917 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Iberia

7.0

Good

2,676 reviews

Delta

8.0

Very Good

7,917 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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.
What are the cheapest airlines to fly from Seattle to Northern Ireland one-way?
To fly one-way, consider booking your trip with British Airways, which is currently one of the cheapest options available, starting at £369. Aer Lingus flights start at £384 while deals on American Airlines start at £413 one-way.
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

Alternative routes for Seattle to Northern Ireland

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Direct flights to United Kingdom

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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 £210

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 24/7. 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

Keep the following information in mind while searching for Seattle to Northern Ireland flight deals. Data was last updated 18 April 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

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 18 April 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 18 April 2025.

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

Rainfall in Northern Ireland by month

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

Temperature in Northern Ireland by month

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

Reviews of airlines servicing 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?

What are the cheapest airlines to fly from Seattle to Northern Ireland one-way?

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?

What is the cheapest month to book a flight 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 18 April 2025.