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Cheap flights from Northern Ireland to Seattle from $464

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Northern Ireland to Seattle departing on 10/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Northern Ireland to Seattle

Cheap round-trip flights

Logo
6:35 am - 8:40 pmBFS-SEA
22h 05m2 stops
Logo
7:00 pm - 11:00 pmSEA-BFS
20h 00m2 stops
$656
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jue., oct. 9 - lun., oct. 13
Logo
6:35 am - 3:30 pmBFS-SEA
16h 55m1 stop
Logo
5:35 pm - 8:35 pmSEA-BFS
19h 00m1 stop
$729
Find Deal
jue., oct. 9 - lun., oct. 13
Logo
7:05 am - 8:40 pmBHD-SEA
21h 35m2 stops
Logo
7:00 pm - 8:25 pmSEA-BHD
17h 25m2 stops
$732
Find Deal
jue., oct. 9 - lun., oct. 13
American Airlines Logo
10:40 am - 4:55 pmBHD-SEA
14h 15m1 stop
American Airlines Logo
1:48 pm - 2:15 pmSEA-BHD
17h 27m2 stops
$749American Airlines
Find Deal
jue., mar. 5 - lun., mar. 9
American Airlines Logo
9:05 am - 4:55 pmBHD-SEA
15h 50m1 stop
American Airlines Logo
1:48 pm - 2:15 pmSEA-BHD
17h 27m2 stops
$750American Airlines
Find Deal
jue., mar. 5 - lun., mar. 9
American Airlines Logo
9:05 am - 11:30 amBHD-SEA
34h 25m1 stop
American Airlines Logo
7:50 pm - 6:35 pmSEA-BHD
15h 45m1 stop
$751American Airlines
Find Deal
jue., mar. 5 - lun., mar. 9
British Airways Logo
8:00 pm - 11:30 amBHD-SEA
23h 30m1 stop
British Airways Logo
7:50 pm - 6:35 pmSEA-BHD
15h 45m1 stop
$753British Airways
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jue., mar. 5 - lun., mar. 9
American Airlines Logo
10:40 am - 11:07 pmBHD-SEA
20h 27m2 stops
American Airlines Logo
11:59 pm - 2:50 pmSEA-BHD
31h 51m2 stops
$755American Airlines
Find Deal
jue., mar. 5 - lun., mar. 9
American Airlines Logo
11:05 am - 11:07 pmBHD-SEA
20h 02m2 stops
American Airlines Logo
11:59 pm - 2:50 pmSEA-BHD
31h 51m2 stops
$756American Airlines
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jue., mar. 5 - lun., mar. 9
Delta Logo
6:30 am - 11:50 amBHD-SEA
13h 20m1 stop
Delta Logo
2:10 pm - 9:15 pmSEA-BHD
23h 05m1 stop
$767Delta
Find Deal
jue., oct. 9 - lun., oct. 13

Delta flights from Northern Ireland to Seattle

Our best Delta deals on Northern Ireland to Seattle flight tickets
Delta
Sep 15
BHD6:30 amBelfast City
20h 30m
2 stops
SEA7:00 pmSeattle/Tacoma Intl
Sep 24
SEA5:40 pmSeattle/Tacoma Intl
15h 15m
1 stop
BHD4:55 pmBelfast City
$733
Find similar
Delta
Sep 15
BHD6:30 amBelfast City
20h 30m
2 stops
SEA7:00 pmSeattle/Tacoma Intl
Sep 24
SEA9:40 amSeattle/Tacoma Intl
23h 15m
2 stops
BHD4:55 pmBelfast City
$737
Find similar
Delta
Sep 15
BHD6:30 amBelfast City
20h 30m
2 stops
SEA7:00 pmSeattle/Tacoma Intl
Sep 24
SEA2:10 pmSeattle/Tacoma Intl
23h 05m
1 stop
BHD9:15 pmBelfast City
$746
Find similar

KLM flights from Northern Ireland to Seattle

Our best KLM deals on Northern Ireland to Seattle flight tickets
KLM
Sep 15
BHD5:25 pmBelfast City
30h 40m
1 stop
SEA4:05 pmSeattle/Tacoma Intl
Sep 24
SEA2:10 pmSeattle/Tacoma Intl
23h 05m
1 stop
BHD9:15 pmBelfast City
$726
Find similar
KLM
Sep 15
BHD5:25 pmBelfast City
30h 40m
1 stop
SEA4:05 pmSeattle/Tacoma Intl
Sep 24
SEA2:10 pmSeattle/Tacoma Intl
18h 45m
1 stop
BHD4:55 pmBelfast City
$727
Find similar

momondo Fare Finder

 
Customize 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, momondo users made 832,500 searches. Data last updated septiembre 8, 2025.
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

BFS - SEA

BFSSEA

Belfast Intl

jue. 10/9

6:35 am-8:40 pm

2 stops22h 05m

Seattle/Tacoma Intl

lun. 10/13

7:00 pm-11:00 pm

2 stops20h 00m

$656

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

jue. 10/9

6:35 am-3:30 pm

1 stop16h 55m

Seattle/Tacoma Intl

lun. 10/13

5:35 pm-8:35 pm

1 stop19h 00m

$729

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

jue. 10/9

7:05 am-8:40 pm

2 stops21h 35m

Seattle/Tacoma Intl

lun. 10/13

7:00 pm-8:25 pm

2 stops17h 25m

$732

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

jue. 3/5

10:40 am-4:55 pm

1 stop14h 15m

Seattle/Tacoma Intl

lun. 3/9

1:48 pm-2:15 pm

2 stops17h 27m

$749

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

jue. 3/5

9:05 am-4:55 pm

1 stop15h 50m

Seattle/Tacoma Intl

lun. 3/9

1:48 pm-2:15 pm

2 stops17h 27m

$750

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

jue. 3/5

9:05 am-11:30 am

1 stop34h 25m

Seattle/Tacoma Intl

lun. 3/9

7:50 pm-6:35 pm

1 stop15h 45m

$751

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

jue. 3/5

8:00 pm-11:30 am

1 stop23h 30m

Seattle/Tacoma Intl

lun. 3/9

7:50 pm-6:35 pm

1 stop15h 45m

$753

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

jue. 3/5

10:40 am-11:07 pm

2 stops20h 27m

Seattle/Tacoma Intl

lun. 3/9

11:59 pm-2:50 pm

2 stops31h 51m

$755

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

jue. 3/5

11:05 am-11:07 pm

2 stops20h 02m

Seattle/Tacoma Intl

lun. 3/9

11:59 pm-2:50 pm

2 stops31h 51m

$756

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

jue. 10/9

6:30 am-11:50 am

1 stop13h 20m

Seattle/Tacoma Intl

lun. 10/13

2:10 pm-9:15 pm

1 stop23h 05m

$767

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 resultsSorted by cheapest first
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See travel insights to Seattle from

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

Can stopping save me money on Northern Ireland to Seattle flights?

You could potentially save up to 8% on your flight if you consider stops on a Northern Ireland to Seattle flight.

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

Direct flights

None
There are no direct flights from Northern Ireland to Seattle. There are no popular flight routes from Northern Ireland to Seattle.
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  • 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.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
Tacoma
SeaTac
Ocean Shores
Olympia
Renton
Lynnwood
Kent
Marysville
Puyallup
Federal Way
Cle Elum
Tukwila
Kirkland
Lakewood
Centralia
Shoreline
Fife
Redmond
Westport

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.

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