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

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

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

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Northern Ireland to Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$620 Cheap Flights from Northern Ireland to Seattle in 2026

Find the cheapest flights from Northern Ireland to Seattle

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

11:35 am - 11:35 amBHD Belfast City-SEA Seattle/Tacoma Intl

32h 00m1 stop London Heathrow

1:30 pm - 10:10 amSEA Seattle/Tacoma Intl-BHD Belfast City

12h 40m1 stop London Heathrow

$868Iberia

Mon, Oct 5 - Thu, Oct 22

11:35 am - 12:36 amBHD Belfast City-SEA Seattle/Tacoma Intl

21h 01m2 stops London Heathrow Chicago O'Hare Intl

3:14 pm - 3:30 pmSEA Seattle/Tacoma Intl-BHD Belfast City

16h 16m2 stops Chicago O'Hare Intl London Heathrow

$873Iberia

Mon, Oct 5 - Thu, Oct 22

6:40 am - 10:42 pmBFS Belfast Intl-SEA Seattle/Tacoma Intl

24h 02m3 stops London Stansted Munich Franz Josef Strauss Vancouver Intl

7:00 pm - 11:05 pmSEA Seattle/Tacoma Intl-BFS Belfast Intl

20h 05m2 stops Reykjavik Keflavik Intl Glasgow Intl

$948Multiple Airlines

Mon, Oct 5 - Thu, Oct 22

6:40 am - 10:42 pmBFS Belfast Intl-SEA Seattle/Tacoma Intl

24h 02m3 stops London Stansted Munich Franz Josef Strauss Vancouver Intl

7:00 pm - 11:25 pmSEA Seattle/Tacoma Intl-BFS Belfast Intl

20h 25m3 stops Reykjavik Keflavik Intl Kastrup Copenhagen London Stansted

$953Multiple Airlines

Mon, Oct 5 - Thu, Oct 22

6:15 am - 9:40 amBFS Belfast Intl-SEA Seattle/Tacoma Intl

35h 25m3 stops London Gatwick Halifax Intl Calgary

7:00 pm - 9:05 pmSEA Seattle/Tacoma Intl-BFS Belfast Intl

18h 05m2 stops Reykjavik Keflavik Intl London Gatwick

$959Multiple Airlines

Tue, Sep 29 - Tue, Oct 6

8:20 am - 8:40 pmBFS Belfast Intl-SEA Seattle/Tacoma Intl

20h 20m2 stops London Gatwick Reykjavik Keflavik Intl

7:00 pm - 9:05 pmSEA Seattle/Tacoma Intl-BFS Belfast Intl

18h 05m2 stops Reykjavik Keflavik Intl London Gatwick

$962Multiple Airlines

Tue, Sep 29 - Tue, Oct 6

8:00 pm - 4:50 pmBHD Belfast City-SEA Seattle/Tacoma Intl

28h 50m1 stop London Heathrow

6:45 pm - 5:25 pmSEA Seattle/Tacoma Intl-BHD Belfast City

14h 40m1 stop London Heathrow

$977British Airways

Thu, Nov 5 - Mon, Nov 9

8:00 pm - 4:50 pmBHD Belfast City-SEA Seattle/Tacoma Intl

28h 50m1 stop London Heathrow

6:45 pm - 5:25 pmSEA Seattle/Tacoma Intl-BHD Belfast City

14h 40m1 stop London Heathrow

$978British Airways

Thu, Nov 5 - Mon, Nov 9

8:00 pm - 4:50 pmBHD Belfast City-SEA Seattle/Tacoma Intl

28h 50m1 stop London Heathrow

6:45 pm - 5:25 pmSEA Seattle/Tacoma Intl-BHD Belfast City

14h 40m1 stop London Heathrow

$979British Airways

Thu, Nov 5 - Mon, Nov 9

9:35 am - 8:15 pmBHD Belfast City-SEA Seattle/Tacoma Intl

18h 40m2 stops London Heathrow Chicago O'Hare Intl

10:31 am - 3:30 pmSEA Seattle/Tacoma Intl-BHD Belfast City

20h 59m2 stops Chicago O'Hare Intl London Heathrow

$984British Airways

Thu, Oct 15 - Mon, Oct 19

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British Airways flights from Northern Ireland to Seattle

Our best British Airways deals on Northern Ireland to Seattle flight tickets

British Airways

Nov 5

BHD8:00 pmBelfast City

28h 50m

1 stop

SEA4:50 pmSeattle/Tacoma Intl

Nov 9

SEA6:45 pmSeattle/Tacoma Intl

14h 40m

1 stop

BHD5:25 pmBelfast City

$977

British Airways

Nov 5

BHD8:00 pmBelfast City

28h 50m

1 stop

SEA4:50 pmSeattle/Tacoma Intl

Nov 9

SEA6:45 pmSeattle/Tacoma Intl

14h 40m

1 stop

BHD5:25 pmBelfast City

$978

British Airways

Nov 5

BHD8:00 pmBelfast City

28h 50m

1 stop

SEA4:50 pmSeattle/Tacoma Intl

Nov 9

SEA6:45 pmSeattle/Tacoma Intl

14h 40m

1 stop

BHD5:25 pmBelfast City

$979

KLM flights from Northern Ireland to Seattle

Our best KLM deals on Northern Ireland to Seattle flight tickets

KLM

Aug 20

BHD9:50 amBelfast City

14h 37m

1 stop

SEA4:27 pmSeattle/Tacoma Intl

Aug 24

SEA1:33 pmSeattle/Tacoma Intl

19h 22m

2 stops

BHD4:55 pmBelfast City

$7,951

KLM

Aug 20

BHD9:50 amBelfast City

14h 37m

1 stop

SEA4:27 pmSeattle/Tacoma Intl

Aug 24

SEA1:33 pmSeattle/Tacoma Intl

19h 22m

2 stops

BHD4:55 pmBelfast City

$7,977

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Mon 10/5

11:35 am-11:35 am

1 stop32h 00m

Seattle/Tacoma Intl

Thu 10/22

1:30 pm-10:10 am

1 stop12h 40m

$868

Quickest round-trip

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Mon 10/5

11:35 am-12:36 am

2 stops21h 01m

Seattle/Tacoma Intl

Thu 10/22

3:14 pm-3:30 pm

2 stops16h 16m

$873

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Mon 10/5

6:40 am-10:42 pm

3 stops24h 02m

Seattle/Tacoma Intl

Thu 10/22

7:00 pm-11:05 pm

2 stops20h 05m

$948

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Mon 10/5

6:40 am-10:42 pm

3 stops24h 02m

Seattle/Tacoma Intl

Thu 10/22

7:00 pm-11:25 pm

3 stops20h 25m

$953

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Tue 9/29

6:15 am-9:40 am

3 stops35h 25m

Seattle/Tacoma Intl

Tue 10/6

7:00 pm-9:05 pm

2 stops18h 05m

$959

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Tue 9/29

8:20 am-8:40 pm

2 stops20h 20m

Seattle/Tacoma Intl

Tue 10/6

7:00 pm-9:05 pm

2 stops18h 05m

$962

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Thu 11/5

8:00 pm-4:50 pm

1 stop28h 50m

Seattle/Tacoma Intl

Mon 11/9

6:45 pm-5:25 pm

1 stop14h 40m

$977

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Thu 11/5

8:00 pm-4:50 pm

1 stop28h 50m

Seattle/Tacoma Intl

Mon 11/9

6:45 pm-5:25 pm

1 stop14h 40m

$978

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Thu 11/5

8:00 pm-4:50 pm

1 stop28h 50m

Seattle/Tacoma Intl

Mon 11/9

6:45 pm-5:25 pm

1 stop14h 40m

$979

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Thu 10/15

9:35 am-8:15 pm

2 stops18h 40m

Seattle/Tacoma Intl

Mon 10/19

10:31 am-3:30 pm

2 stops20h 59m

$984

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 Northern Ireland to Seattle

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 airline that flies from Northern Ireland to Seattle/Tacoma Intl?

Aer Lingus and British Airways are the most popular carriers operating from Northern Ireland to Seattle/Tacoma Intl

Cheap Northern Ireland to Seattle flight deals and tips

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

Best Price Found	$620
Fastest flight time	13h 45m
Direct flights	None

The best one-way flight to Seattle from Northern Ireland in the past 72 hours is $620. The best round-trip flight deal from Northern Ireland to Seattle found on momondo in the last 72 hours is $868.

The fastest flight from Northern Ireland to Seattle takes 13h 45m

There are no direct flights from Northern Ireland to Seattle. There are no popular flight routes from Northern Ireland to Seattle.

Search flight deals

Frequently asked questions about flying from Northern Ireland to Seattle

When did momondo last update prices for flights from Northern Ireland to Seattle/Tacoma Intl Airport?
Prices for flights from Northern Ireland to Seattle/Tacoma Intl Airport are updated daily.
How old do you have to be to fly from Northern Ireland to Seattle/Tacoma Intl Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Northern Ireland to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

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SeaTac

Ocean Shores

Renton

Kent

Olympia

Lynnwood

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Lakewood

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Puyallup

Fife

Tukwila

Cle Elum

Marysville

Kirkland

Lacey

Shoreline

Centralia

Why use momondo?

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

Finding the right flight to Seattle from Northern Ireland 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 Seattle quick and easy, saving you time and money.

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

Yes. momondo allows you to filter the results for Northern Ireland to Seattle flights to just show those with flexible booking policies.

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

Once all potential Northern Ireland to Seattle flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

If you are simply researching potential flights to Seattle, momondo offers a useful price alert feature which will track prices for flights to Seattle from Northern Ireland and alert you when they change.