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Cheap flights from Northern Ireland to Seattle from £404

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 29/10. 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
1 adult, Economy, 0 bags

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Find the cheapest flights from Northern Ireland to Seattle

Cheap return flights

Enter your travel dates to find the best prices.
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
19:50 - 18:35
SEA
-
BHD
15h 45m
1 stop
£557British Airways
Thu, 22 Oct - Mon, 26 Oct
British Airways Logo
20:35 - 11:35
BHD
-
SEA
23h 00m
1 stop
British Airways Logo
20:20 - 19:50
SEA
-
BHD
15h 30m
1 stop
£578British Airways
Wed, 23 Sep - Wed, 14 Oct
British Airways Logo
12:45 - 00:14
BHD
-
SEA
19h 29m
2 stops
British Airways Logo
15:10 - 14:15
SEA
-
BHD
16h 05m
2 stops
£582British Airways
Thu, 22 Oct - Mon, 26 Oct
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
17:40 - 09:00
SEA
-
BHD
31h 20m
2 stops
£598British Airways
Thu, 17 Sep - Mon, 21 Sep
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
17:40 - 09:00
SEA
-
BHD
31h 20m
2 stops
£599British Airways
Thu, 17 Sep - Mon, 21 Sep
KLM Logo
09:50 - 11:47
BHD
-
SEA
33h 57m
1 stop
KLM Logo
17:45 - 16:55
SEA
-
BHD
15h 10m
2 stops
£600KLM
Wed, 23 Sep - Wed, 14 Oct
Delta Logo
09:50 - 18:55
BHD
-
SEA
17h 05m
2 stops
Delta Logo
07:30 - 09:20
SEA
-
BHD
17h 50m
2 stops
£600Delta
Wed, 23 Sep - Wed, 14 Oct
British Airways Logo
20:35 - 21:36
BHD
-
SEA
33h 01m
2 stops
British Airways Logo
17:40 - 09:00
SEA
-
BHD
31h 20m
2 stops
£602British Airways
Thu, 17 Sep - Mon, 21 Sep
Multiple Airlines Logo
07:20 - 09:40
BFS
-
SEA
34h 20m
3 stops
Multiple Airlines Logo
19:10 - 21:15
SEA
-
BFS
18h 05m
2 stops
£918Multiple Airlines
Fri, 7 Aug - Fri, 14 Aug
Multiple Airlines Logo
07:20 - 09:40
BFS
-
SEA
34h 20m
3 stops
Multiple Airlines Logo
05:50 - 16:30
SEA
-
BFS
26h 40m
3 stops
£937Multiple Airlines
Fri, 7 Aug - Fri, 14 Aug

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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
22 Oct
BHD06:30Belfast City
13h 05m
1 stop
SEA11:35Seattle/Tacoma Intl
26 Oct
SEA19:50Seattle/Tacoma Intl
15h 45m
1 stop
BHD18:35Belfast City
£557
British Airways
23 Sept
BHD20:35Belfast City
23h 00m
1 stop
SEA11:35Seattle/Tacoma Intl
14 Oct
SEA20:20Seattle/Tacoma Intl
15h 30m
1 stop
BHD19:50Belfast City
£578
British Airways
22 Oct
BHD12:45Belfast City
19h 29m
2 stops
SEA00:14Seattle/Tacoma Intl
26 Oct
SEA15:10Seattle/Tacoma Intl
16h 05m
2 stops
BHD14:15Belfast City
£582

American Airlines flights from Northern Ireland to Seattle

Our best American Airlines deals on Northern Ireland to Seattle flight tickets
American Airlines
26 Jul
BHD11:00Belfast City
34h 19m
2 stops
SEA13:19Seattle/Tacoma Intl
3 Aug
SEA06:00Seattle/Tacoma Intl
25h 30m
2 stops
BHD15:30Belfast City
£660
American Airlines
26 Jul
BHD11:00Belfast City
34h 19m
2 stops
SEA13:19Seattle/Tacoma Intl
3 Aug
SEA20:20Seattle/Tacoma Intl
14h 25m
1 stop
BHD18:45Belfast City
£713

momondo Fare Finder

 
Customise 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 279,928 searches. Data last updated 25 June 2026.
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

Cheapest return flight
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 22/10

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Mon 26/10

19:50-18:35

1 stop15h 45m

£557

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 23/9

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Wed 14/10

20:20-19:50

1 stop15h 30m

£578

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 22/10

12:45-00:14

2 stops19h 29m

Seattle/Tacoma Intl

Mon 26/10

15:10-14:15

2 stops16h 05m

£582

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 17/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Mon 21/9

17:40-09:00

2 stops31h 20m

£598

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 17/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Mon 21/9

17:40-09:00

2 stops31h 20m

£599

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 23/9

09:50-11:47

1 stop33h 57m

Seattle/Tacoma Intl

Wed 14/10

17:45-16:55

2 stops15h 10m

£600

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 23/9

09:50-18:55

2 stops17h 05m

Seattle/Tacoma Intl

Wed 14/10

07:30-09:20

2 stops17h 50m

£600

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 17/9

20:35-21:36

2 stops33h 01m

Seattle/Tacoma Intl

Mon 21/9

17:40-09:00

2 stops31h 20m

£602

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 7/8

07:20-09:40

3 stops34h 20m

Seattle/Tacoma Intl

Fri 14/8

19:10-21:15

2 stops18h 05m

£918

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 7/8

07:20-09:40

3 stops34h 20m

Seattle/Tacoma Intl

Fri 14/8

05:50-16:30

3 stops26h 40m

£937

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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

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

British Airways and Aer Lingus 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

Fastest flight time

13h 05m

Direct flights

None
The fastest flight from Northern Ireland to Seattle takes 13h 05m
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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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 refresh daily.

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

  • 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 required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Northern Ireland to Seattle

Compare and see reviews for airlines that fly from Northern Ireland to Seattle with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom £570Free CancellationRating
7.1
11,757 reviews
Search American Airlines flights

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Kirkland
Fife
Ashford
Tacoma
SeaTac
Tukwila

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Northern Ireland to Seattle. momondo saves you time and could save you money on your trip.

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

momondo does allow users to show only those flights to Seattle from Northern Ireland which offer a flexible booking policy as well as other useful filters and features.

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

momondo helps you find the best flight between Northern Ireland and Seattle by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Price alerts on flights to Seattle from Northern Ireland are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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