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

For one-way options, check prices for Aer Lingus. According to our data, you can fly for as low as £787. Users have also found prices from £2,675 and £2,710 on Delta and Iberia, respectively.

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.

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

May is one of the best times of the year to fly to Seattle from Northern Ireland. Prices for May average £633 per person but you can even find prices for as low as £440. The most expensive prices can be found in the month of July. Opting for a May flight can save you 30% on your journey compared to booking in July

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.

£596+ Flights from Northern Ireland to Seattle - Compare & Save Big

Cheap flight deals from Northern Ireland to Seattle

Round-trip from	£596
Popular in	July
Cheapest in	May
Average price	£519

British Airways
8/5-22/5
2 total stops
35h 30m total
Northern Ireland to Seattle

Search Deals

Highest demand for flights based on searches. 18% potential increase in price (£111 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£16 potential savings vs. average return price).

Search Deals

Average for round-trip flights in April 2025

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 24 April 2025.

Thu 8/506:35BHD - SEA

1 stop19h 45mBritish Airways

Thu 22/513:30SEA - BHD

1 stop15h 45mBritish Airways

Deal found 24/4£596

Thu 8/506:30BHD - SEA

1 stop17h 27mKLM

Thu 22/514:10SEA - BHD

1 stop23h 05mKLM

Deal found 23/4£601

Thu 8/506:35BHD - SEA

1 stop13h 00mAmerican Airlines

Thu 22/513:30SEA - BHD

1 stop13h 40mAmerican Airlines

Deal found 22/4£614

Wed 21/506:00BFS - SEA

2 stops37h 25mMultiple Airlines

Wed 28/515:45SEA - BFS

2 stops23h 25mMultiple Airlines

Deal found 22/4£615

Thu 8/506:30BHD - SEA

2 stops19h 20mDelta

Thu 29/511:40SEA - BHD

2 stops21h 15mDelta

Deal found 24/4£647

Thu 8/512:40BHD - SEA

2 stops16h 59mMultiple Airlines

Thu 22/519:35SEA - BHD

2 stops15h 45mMultiple Airlines

Deal found 23/4£866

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 24 April 2025.

Thu 8/506:35BHD - SEA

1 stop19h 45mBritish Airways

Thu 22/513:30SEA - BHD

1 stop15h 45mBritish Airways

Deal found 24/4£596

Thu 8/506:30BHD - SEA

1 stop17h 27mKLM

Thu 22/514:10SEA - BHD

1 stop23h 05mKLM

Deal found 23/4£601

Thu 8/506:35BHD - SEA

1 stop13h 00mAmerican Airlines

Thu 22/513:30SEA - BHD

1 stop13h 40mAmerican Airlines

Deal found 22/4£614

Wed 21/506:00BFS - SEA

2 stops37h 25mMultiple Airlines

Wed 28/515:45SEA - BFS

2 stops23h 25mMultiple Airlines

Deal found 22/4£615

Thu 8/506:30BHD - SEA

2 stops19h 20mDelta

Thu 29/511:40SEA - BHD

2 stops21h 15mDelta

Deal found 24/4£647

Thu 8/512:40BHD - SEA

2 stops16h 59mMultiple Airlines

Thu 22/519:35SEA - BHD

2 stops15h 45mMultiple Airlines

Deal found 23/4£866

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

Thu 8/506:35BHD - SEA

1 stop19h 45mBritish Airways

Thu 22/513:30SEA - BHD

1 stop15h 45mBritish Airways

Deal found 24/4£596

Thu 8/506:30BHD - SEA

1 stop17h 27mKLM

Thu 22/514:10SEA - BHD

1 stop23h 05mKLM

Deal found 23/4£601

Thu 8/506:35BHD - SEA

1 stop13h 00mAmerican Airlines

Thu 22/513:30SEA - BHD

1 stop13h 40mAmerican Airlines

Deal found 22/4£614

Thu 8/506:30BHD - SEA

2 stops19h 20mDelta

Thu 29/511:40SEA - BHD

2 stops21h 15mDelta

Deal found 24/4£647

Thu 8/512:40BHD - SEA

2 stops16h 59mMultiple Airlines

Thu 22/519:35SEA - BHD

2 stops15h 45mMultiple Airlines

Deal found 23/4£866

Wed 21/506:00BFS - SEA

2 stops37h 25mMultiple Airlines

Wed 28/515:45SEA - BFS

2 stops23h 25mMultiple Airlines

Deal found 22/4£615

One-way flights from Northern Ireland to Seattle
Search for one-way flight options from Northern Ireland to Seattle. Find affordable one-way fares based on user searches. Data last updated 24 April 2025.

Tue 27/513:40BHD - SEA

3 stops41h 07mMultiple Airlines

Deal found 24/4£711

Wed 30/706:50BHD - SEA

2 stops19h 00mAer Lingus

Deal found 23/4£787

Wed 21/506:30BHD - SEA

1 stop13h 10mDelta

Deal found 24/4£2,675

Thu 26/609:35BHD - SEA

1 stop16h 45mIberia

Deal found 24/4£2,710

Sat 28/609:35BHD - SEA

1 stop16h 45mBritish Airways

Deal found 24/4£7,170

Sun 29/611:00BHD - SEA

2 stops21h 44mAmerican Airlines

Deal found 24/4£12,511

Wed 25/620:15BHD - SEA

1 stop23h 20mFinnair

Deal found 24/4£12,999

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

Thu 8/5

06:35-18:20

1 stop19h 45m

Seattle/Tacoma Intl

Thu 22/5

13:30-13:15

1 stop15h 45m

£596

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 8/5

06:30-15:57

1 stop17h 27m

Seattle/Tacoma Intl

Thu 22/5

14:10-21:15

1 stop23h 05m

£601

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 8/5

06:35-11:35

1 stop13h 00m

Seattle/Tacoma Intl

Thu 22/5

13:30-11:10

1 stop13h 40m

£614

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 21/5

06:00-11:25

2 stops37h 25m

Seattle/Tacoma Intl

Wed 28/5

15:45-23:10

2 stops23h 25m

£615

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 8/5

06:30-17:50

2 stops19h 20m

Seattle/Tacoma Intl

Thu 29/5

11:40-16:55

2 stops21h 15m

£647

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 8/5

12:40-21:39

2 stops16h 59m

Seattle/Tacoma Intl

Thu 22/5

19:35-19:20

2 stops15h 45m

£866

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 27/5

13:40-22:47

3 stops41h 07m

£711

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 30/7

06:50-17:50

2 stops19h 00m

£787

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 21/5

06:30-11:40

1 stop13h 10m

£2,675

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 26/6

09:35-18:20

1 stop16h 45m

£2,710

Flights are sorted by cheapest return flights first.

Deals found on 24/4

Showing 1-10 of 13 results

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?

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

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

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

Delta

8.0

Very Good

7,920 reviews

Check prices

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

7,920 reviews

Delta

8.0

Very Good

7,920 reviews

Check prices

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

1,333 reviews

Delta

8.0

Very Good

7,920 reviews

Check prices

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

Finnair

7.6

Good

1,272 reviews

Delta

8.0

Very Good

7,920 reviews

Check prices

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

7,920 reviews

Check prices

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

1,068 reviews

Delta

8.0

Very Good

7,920 reviews

Check prices

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

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.
What are the cheapest airlines to fly from Northern Ireland to Seattle one-way?
For one-way options, check prices for Aer Lingus. According to our data, you can fly for as low as £787. Users have also found prices from £2,675 and £2,710 on Delta and Iberia, respectively.
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

Tacoma

Leavenworth

Bothell

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Northern Ireland to Seattle

Airline	Cheapest	Average	Flexibility	On-time
British Airways	Cheapest£443	Average£529	FlexibilityNo cancel fee	On-time70%	Search British Airways flights

Fly with Cheapflights

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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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 Northern Ireland to Seattle from £596

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/5. 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

Keep the following information in mind while searching for Northern Ireland to Seattle flight deals. Data was last updated 24 April 2025.

Round-trip from

Popular in

Cheapest in

Average price

Find 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 24 April 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 24 April 2025.

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

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 24 April 2025.

Rainfall in Seattle by month

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

Temperature in Seattle by month

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

Reviews of airlines servicing 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?

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

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?

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

Travelling to a place near 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 Northern Ireland to Seattle

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

Top airline 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?

100% Free

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Travel Smart

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 24 April 2025.