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Cheap flights from Northern Ireland to Seattle from £496

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 3/1. 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

Find the cheapest flights from Northern Ireland to Seattle

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
06:10 - 20:40
BFS
-
SEA
22h 30m
2 stops
Multiple Airlines Logo
19:00 - 21:05
SEA
-
BFS
18h 05m
2 stops
£641Multiple Airlines
Thu, 3 Sep - Tue, 8 Sep
Multiple Airlines Logo
10:35 - 20:14
BFS
-
SEA
17h 39m
1 stop
Multiple Airlines Logo
07:15 - 13:50
SEA
-
BFS
22h 35m
2 stops
£669Multiple Airlines
Mon, 5 Oct - Fri, 9 Oct
Multiple Airlines Logo
08:45 - 20:14
BHD
-
SEA
19h 29m
1 stop
Multiple Airlines Logo
07:15 - 20:30
SEA
-
BHD
29h 15m
2 stops
£680Multiple Airlines
Mon, 5 Oct - Fri, 9 Oct
Multiple Airlines Logo
11:45 - 17:55
BHD
-
SEA
38h 10m
2 stops
Multiple Airlines Logo
15:40 - 20:30
SEA
-
BHD
20h 50m
2 stops
£687Multiple Airlines
Mon, 5 Oct - Fri, 9 Oct
Multiple Airlines Logo
21:35 - 18:32
BFS
-
SEA
28h 57m
3 stops
Multiple Airlines Logo
15:40 - 21:15
SEA
-
BFS
21h 35m
2 stops
£690Multiple Airlines
Mon, 5 Oct - Fri, 9 Oct
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
06:15 - 10:30
SEA
-
BHD
20h 15m
2 stops
£705British Airways
Thu, 17 Sep - Sun, 20 Sep
British Airways Logo
09:15 - 16:50
BHD
-
SEA
15h 35m
1 stop
British Airways Logo
18:45 - 16:50
SEA
-
BHD
14h 05m
1 stop
£706British Airways
Wed, 25 Nov - Sun, 29 Nov
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
06:15 - 10:30
SEA
-
BHD
20h 15m
2 stops
£707British Airways
Thu, 17 Sep - Sun, 20 Sep
Multiple Airlines Logo
06:40 - 21:04
BFS
-
SEA
22h 24m
2 stops
Multiple Airlines Logo
15:40 - 21:15
SEA
-
BFS
21h 35m
2 stops
£707Multiple Airlines
Mon, 5 Oct - Fri, 9 Oct
Multiple Airlines Logo
06:10 - 20:40
BFS
-
SEA
22h 30m
2 stops
Multiple Airlines Logo
19:00 - 20:40
SEA
-
BFS
17h 40m
2 stops
£708Multiple Airlines
Wed, 26 Aug - Wed, 2 Sep

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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
17 Sept
BHD06:30Belfast City
13h 05m
1 stop
SEA11:35Seattle/Tacoma Intl
20 Sept
SEA06:15Seattle/Tacoma Intl
20h 15m
2 stops
BHD10:30Belfast City
£705
British Airways
25 Nov
BHD09:15Belfast City
15h 35m
1 stop
SEA16:50Seattle/Tacoma Intl
29 Nov
SEA18:45Seattle/Tacoma Intl
14h 05m
1 stop
BHD16:50Belfast City
£706
British Airways
17 Sept
BHD06:30Belfast City
13h 05m
1 stop
SEA11:35Seattle/Tacoma Intl
20 Sept
SEA06:15Seattle/Tacoma Intl
20h 15m
2 stops
BHD10:30Belfast City
£707

Aer Lingus flights from Northern Ireland to Seattle

Our best Aer Lingus deals on Northern Ireland to Seattle flight tickets
Aer Lingus
11 Aug
BHD09:50Belfast City
15h 20m
2 stops
SEA17:10Seattle/Tacoma Intl
18 Aug
SEA19:10Seattle/Tacoma Intl
14h 50m
2 stops
BHD18:00Belfast City
£932
Aer Lingus
19 Aug
BHD09:50Belfast City
15h 20m
2 stops
SEA17:10Seattle/Tacoma Intl
24 Aug
SEA19:10Seattle/Tacoma Intl
14h 50m
2 stops
BHD18:00Belfast City
£3,211
Aer Lingus
19 Aug
BHD09:50Belfast City
15h 20m
2 stops
SEA17:10Seattle/Tacoma Intl
24 Aug
SEA19:10Seattle/Tacoma Intl
14h 50m
2 stops
BHD18:00Belfast City
£3,215

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 31 July 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

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 3/9

06:10-20:40

2 stops22h 30m

Seattle/Tacoma Intl

Tue 8/9

19:00-21:05

2 stops18h 05m

£641

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 5/10

10:35-20:14

1 stop17h 39m

Seattle/Tacoma Intl

Fri 9/10

07:15-13:50

2 stops22h 35m

£669

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 5/10

08:45-20:14

1 stop19h 29m

Seattle/Tacoma Intl

Fri 9/10

07:15-20:30

2 stops29h 15m

£680

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 5/10

11:45-17:55

2 stops38h 10m

Seattle/Tacoma Intl

Fri 9/10

15:40-20:30

2 stops20h 50m

£687

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 5/10

21:35-18:32

3 stops28h 57m

Seattle/Tacoma Intl

Fri 9/10

15:40-21:15

2 stops21h 35m

£690

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 17/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Sun 20/9

06:15-10:30

2 stops20h 15m

£705
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 25/11

09:15-16:50

1 stop15h 35m

Seattle/Tacoma Intl

Sun 29/11

18:45-16:50

1 stop14h 05m

£706

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 17/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Sun 20/9

06:15-10:30

2 stops20h 15m

£707

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 5/10

06:40-21:04

2 stops22h 24m

Seattle/Tacoma Intl

Fri 9/10

15:40-21:15

2 stops21h 35m

£707

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 26/8

06:10-20:40

2 stops22h 30m

Seattle/Tacoma Intl

Wed 2/9

19:00-20:40

2 stops17h 40m

£708

Flights are sorted by cheapest return flights first.

Showing 1-10 of 15 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

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

British Airways is the most popular carrier 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.
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 refresh 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 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.

Travelling to a place near Seattle?

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

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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