What is the cheapest airline that flies from Seattle/Tacoma Intl to Northern Ireland?

British Airways, American Airlines, and KLM are the most popular carriers operating from Seattle/Tacoma Intl to Northern Ireland

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Northern Ireland?

Prices for flights from Seattle/Tacoma Intl Airport to Northern Ireland are updated daily.

How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Northern Ireland?

As of July 2025, there is 1 operator available to choose from for flights from Seattle/Tacoma Intl Airport to Northern Ireland.

How old do you have to be to fly from Seattle/Tacoma Intl Airport to Northern Ireland?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Northern Ireland.

What documentation or ID do you need to fly to Northern Ireland?

The necessary travel and health documents for your Northern Ireland trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$389 Cheap Flights from Seattle to Northern Ireland in 2025

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Seattle to Northern Ireland

Round-trip

One-way

Cheap round-trip flights

7:00 pm - 10:25 pmSEA-BFS

19h 25m2 stops

6:45 am - 8:40 pmBFS-SEA

21h 55m2 stops

$564

Find Deal

Sun, Sep 14 - Mon, Sep 29

7:00 pm - 11:10 pmSEA-BFS

20h 10m2 stops

7:00 am - 8:40 pmBFS-SEA

21h 40m2 stops

$707

Find Deal

Sun, Sep 7 - Tue, Sep 23

3:00 pm - 3:35 pmSEA-BHD

16h 35m2 stops

7:30 pm - 11:10 amBHD-SEA

23h 40m1 stop

$743British Airways

Find Deal

Wed, Sep 10 - Mon, Sep 15

3:00 pm - 6:40 pmSEA-BHD

19h 40m2 stops

6:30 pm - 5:29 pmBHD-SEA

30h 59m2 stops

$746British Airways

Find Deal

Wed, Sep 10 - Mon, Sep 15

7:50 pm - 4:35 pmSEA-BHD

13h 45m1 stop

9:15 am - 4:55 pmBHD-SEA

15h 40m1 stop

$749British Airways

Find Deal

Wed, Oct 29 - Wed, Nov 5

1:55 pm - 4:55 pmSEA-BHD

19h 00m1 stop

6:30 am - 11:42 pmBHD-SEA

25h 12m2 stops

$828Delta

Find Deal

Sun, Sep 7 - Tue, Sep 23

9:40 am - 4:55 pmSEA-BHD

23h 15m2 stops

6:30 am - 7:00 pmBHD-SEA

20h 30m2 stops

$842Delta

Find Deal

Sun, Sep 7 - Tue, Sep 23

7:35 pm - 9:45 amSEA-BHD

30h 10m2 stops

9:50 am - 5:50 pmBHD-SEA

16h 00m2 stops

$859Aer Lingus

Find Deal

Sun, Sep 7 - Tue, Sep 23

5:40 pm - 9:15 pmSEA-BHD

19h 35m1 stop

6:40 am - 4:05 pmBHD-SEA

17h 25m1 stop

$954KLM

Find Deal

Sun, Aug 24 - Thu, Sep 4

11:15 am - 4:50 pmSEA-BHD

21h 35m2 stops

6:30 am - 11:50 amBHD-SEA

13h 20m1 stop

$996KLM

Find Deal

Wed, Dec 3 - Sun, Dec 7

Delta flights from Seattle to Northern Ireland

Our best Delta deals on Seattle to Northern Ireland flight tickets

Delta

Sep 7

SEA1:55 pmSeattle/Tacoma Intl

19h 00m

1 stop

BHD4:55 pmBelfast City

Sep 23

BHD6:30 amBelfast City

25h 12m

2 stops

SEA11:42 pmSeattle/Tacoma Intl

$828

Find similar

Delta

Sep 7

SEA9:40 amSeattle/Tacoma Intl

23h 15m

2 stops

BHD4:55 pmBelfast City

Sep 23

BHD6:30 amBelfast City

20h 30m

2 stops

SEA7:00 pmSeattle/Tacoma Intl

$842

Find similar

Delta

Dec 23

SEA3:00 pmSeattle/Tacoma Intl

17h 50m

1 stop

BHD4:50 pmBelfast City

Jan 12

BHD5:20 pmBelfast City

26h 30m

1 stop

SEA11:50 amSeattle/Tacoma Intl

$914

Find similar

KLM flights from Seattle to Northern Ireland

Our best KLM deals on Seattle to Northern Ireland flight tickets

KLM

Aug 24

SEA5:40 pmSeattle/Tacoma Intl

19h 35m

1 stop

BHD9:15 pmBelfast City

Sep 4

BHD6:40 amBelfast City

17h 25m

1 stop

SEA4:05 pmSeattle/Tacoma Intl

$954

Find similar

KLM

Dec 3

SEA11:15 amSeattle/Tacoma Intl

21h 35m

2 stops

BHD4:50 pmBelfast City

Dec 7

BHD6:30 amBelfast City

13h 20m

1 stop

SEA11:50 amSeattle/Tacoma Intl

$996

Find similar

KLM

Aug 13

SEA5:40 pmSeattle/Tacoma Intl

15h 15m

1 stop

BHD4:55 pmBelfast City

Aug 17

BHD5:25 pmBelfast City

26h 10m

1 stop

SEA11:35 amSeattle/Tacoma Intl

$1,112

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 9/14

7:00 pm-10:25 pm

2 stops19h 25m

Belfast Intl

Mon 9/29

6:45 am-8:40 pm

2 stops21h 55m

$564

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 9/7

7:00 pm-11:10 pm

2 stops20h 10m

Belfast Intl

Tue 9/23

7:00 am-8:40 pm

2 stops21h 40m

$707

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 9/10

3:00 pm-3:35 pm

2 stops16h 35m

Belfast City

Mon 9/15

7:30 pm-11:10 am

1 stop23h 40m

$743

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 9/10

3:00 pm-6:40 pm

2 stops19h 40m

Belfast City

Mon 9/15

6:30 pm-5:29 pm

2 stops30h 59m

$746

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 10/29

7:50 pm-4:35 pm

1 stop13h 45m

Belfast City

Wed 11/5

9:15 am-4:55 pm

1 stop15h 40m

$749

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 9/7

1:55 pm-4:55 pm

1 stop19h 00m

Belfast City

Tue 9/23

6:30 am-11:42 pm

2 stops25h 12m

$828

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 9/7

9:40 am-4:55 pm

2 stops23h 15m

Belfast City

Tue 9/23

6:30 am-7:00 pm

2 stops20h 30m

$842

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 9/7

7:35 pm-9:45 am

2 stops30h 10m

Belfast City

Tue 9/23

9:50 am-5:50 pm

2 stops16h 00m

$859

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 8/24

5:40 pm-9:15 pm

1 stop19h 35m

Belfast City

Thu 9/4

6:40 am-4:05 pm

1 stop17h 25m

$954

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 12/3

11:15 am-4:50 pm

2 stops21h 35m

Belfast City

Sun 12/7

6:30 am-11:50 am

1 stop13h 20m

$996

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Seattle to Northern Ireland

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest day to depart on your flight to Northern Ireland?

The cheapest day to depart on your flight to Northern Ireland is on a Tuesday when prices can be found for as low as $724. This is often the case because there is less demand to fly during this day of the week. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from Seattle to Northern Ireland for around $1,208.

What is the cheapest time of day to depart on your flight to Northern Ireland?

At noon is the cheapest time of day to fly from Seattle to Northern Ireland when you can find flight prices for as low as $794. Flying to Northern Ireland at noon is an ideal time because this is during off-peak travel hours. Flights in the afternoon are often more expensive with an average ticket price of $1,000.

Cheap Seattle to Northern Ireland flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Northern Ireland

Best Price Found	$389
Fastest flight time	13h 05m
Direct flights	None
Airports in Northern Ireland	2 airports

The best one-way flight to Northern Ireland from Seattle in the past 72 hours is $389. The best round-trip flight deal from Seattle to Northern Ireland found on momondo in the last 72 hours is $564.

The fastest flight from Seattle to Northern Ireland takes 13h 05m

There are no direct flights from Seattle to Northern Ireland. Popular non-direct routes for this connection are Seattle/Tacoma Intl Airport - Belfast Intl Airport and Seattle/Tacoma Intl Airport - Belfast City Airport.

There are 2 airports near Northern Ireland: Belfast Intl (BFS), Belfast City (BHD)

Search flight deals

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Northern Ireland?
Prices for flights from Seattle/Tacoma Intl Airport to Northern Ireland are updated daily.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Northern Ireland?
As of July 2025, there is 1 operator available to choose from for flights from Seattle/Tacoma Intl Airport to Northern Ireland.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Northern Ireland?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Northern Ireland.
What documentation or ID do you need to fly to Northern Ireland?
The necessary travel and health documents for your Northern Ireland trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Seattle to Northern Ireland

Compare and see reviews for airlines that fly from Seattle to Northern Ireland with momondo

Airline	Rating	Free Cancellation	Price
British Airways	PriceFrom $519	Free Cancellation	Rating 6.6 7,222 reviews		Search British Airways flights

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Northern Ireland?

Finding the right flight to Northern Ireland from Seattle is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Northern Ireland quick and easy, saving you time and money.

Can I find flights from Seattle to Northern Ireland with flexible booking policies on momondo?

Flights from Seattle to Northern Ireland with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Seattle to Northern Ireland?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Seattle to Northern Ireland.

I’m not ready to book a flight from Seattle to Northern Ireland right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Seattle to Northern Ireland flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your Northern Ireland trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Tue 8/5

Tue 8/12

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Northern Ireland

Popular cities in Northern Ireland

Flights to Londonfrom $283

Flights to Manchesterfrom $372

Flights to Edinburghfrom $405

Flights to Glasgowfrom $417

Flights to Birminghamfrom $384

Flights to Belfastfrom $442

Flights to Newcastle upon Tynefrom $462

Flights to Bristolfrom $465

Flights to Invernessfrom $402

Flights to Liverpoolfrom $475

Flights to Aberdeenfrom $506

Flights to Leedsfrom $473

Cheap flights from Seattle to Northern Ireland from $389

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Northern Ireland departing on 8/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Seattle to Northern Ireland

Cheap round-trip flights

Cheap one-way flights

Delta flights from Seattle to Northern Ireland

Our best Delta deals on Seattle to Northern Ireland flight tickets

KLM flights from Seattle to Northern Ireland

Our best KLM deals on Seattle to Northern Ireland flight tickets

momondo Fare Finder

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

See travel insights to Northern Ireland from

How to get the cheapest flight ticket from Seattle to Northern Ireland

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Northern Ireland?

What is the cheapest time of day to depart on your flight to Northern Ireland?

What is the cheapest airline that flies from Seattle/Tacoma Intl to Northern Ireland?

British Airways, American Airlines, and KLM are the most popular carriers operating from Seattle/Tacoma Intl to Northern Ireland

Cheap Seattle to Northern Ireland flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Northern Ireland

Best Price Found

Fastest flight time

Direct flights

Airports in Northern Ireland

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Northern Ireland?

How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Northern Ireland?

How old do you have to be to fly from Seattle/Tacoma Intl Airport to Northern Ireland?

What documentation or ID do you need to fly to Northern Ireland?

Best airlines flying from Seattle to Northern Ireland

Compare and see reviews for airlines that fly from Seattle to Northern Ireland with momondo

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Northern Ireland?

Can I find flights from Seattle to Northern Ireland with flexible booking policies on momondo?

How can momondo help me find flights from Seattle to Northern Ireland?

I’m not ready to book a flight from Seattle to Northern Ireland right now. Can momondo alert me if prices change?

An easier way to manage your Northern Ireland trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Northern Ireland

Popular cities in Northern Ireland

Popular flights according to clicks in the last 7 days on momondo