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Cheap flights from Northern Ireland to Seattle from £380

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 15/7. 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 return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
06:30 - 18:45
BFS
-
SEA
44h 15m
3 stops
Multiple Airlines Logo
15:40 - 22:15
SEA
-
BFS
22h 35m
3 stops
£748Multiple Airlines
Mon, 29 Jun - Mon, 6 Jul
British Airways Logo
06:30 - 18:25
BHD
-
SEA
19h 55m
1 stop
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
£754British Airways
Thu, 15 Oct - Mon, 19 Oct
British Airways Logo
06:35 - 23:18
BHD
-
SEA
24h 43m
2 stops
British Airways Logo
14:46 - 10:40
SEA
-
BHD
35h 54m
2 stops
£756British Airways
Wed, 4 Nov - Sun, 8 Nov
Multiple Airlines Logo
12:45 - 18:25
BHD
-
SEA
13h 40m
1 stop
Multiple Airlines Logo
11:34 - 15:30
SEA
-
BHD
19h 56m
2 stops
£761Multiple Airlines
Thu, 15 Oct - Mon, 19 Oct
Multiple Airlines Logo
06:30 - 00:14
BHD
-
SEA
25h 44m
2 stops
Multiple Airlines Logo
15:10 - 15:30
SEA
-
BHD
16h 20m
2 stops
£765Multiple Airlines
Thu, 15 Oct - Mon, 19 Oct
Multiple Airlines Logo
06:30 - 18:45
BFS
-
SEA
44h 15m
3 stops
Multiple Airlines Logo
19:00 - 22:35
SEA
-
BFS
19h 35m
2 stops
£773Multiple Airlines
Mon, 29 Jun - Mon, 6 Jul
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
06:23 - 10:30
SEA
-
BHD
20h 07m
2 stops
£782British Airways
Wed, 7 Oct - Sun, 11 Oct
Multiple Airlines Logo
08:25 - 09:40
BFS
-
SEA
33h 15m
3 stops
Multiple Airlines Logo
05:45 - 18:25
SEA
-
BFS
28h 40m
3 stops
£795Multiple Airlines
Sun, 21 Jun - Sun, 28 Jun
British Airways Logo
10:05 - 00:15
BHD
-
SEA
22h 10m
2 stops
British Airways Logo
06:23 - 10:30
SEA
-
BHD
20h 07m
2 stops
£797British Airways
Wed, 7 Oct - Sun, 11 Oct
British Airways Logo
20:35 - 18:25
BHD
-
SEA
29h 50m
1 stop
British Airways Logo
11:34 - 15:30
SEA
-
BHD
19h 56m
2 stops
£801British Airways
Thu, 15 Oct - Mon, 19 Oct

British Airways flights from Northern Ireland to Seattle

Our best British Airways deals on Northern Ireland to Seattle flight tickets
British Airways
15 Oct
BHD06:30Belfast City
19h 55m
1 stop
SEA18:25Seattle/Tacoma Intl
19 Oct
SEA20:20Seattle/Tacoma Intl
14h 25m
1 stop
BHD18:45Belfast City
£754
British Airways
4 Nov
BHD06:35Belfast City
24h 43m
2 stops
SEA23:18Seattle/Tacoma Intl
8 Nov
SEA14:46Seattle/Tacoma Intl
35h 54m
2 stops
BHD10:40Belfast City
£756
British Airways
7 Oct
BHD06:30Belfast City
13h 05m
1 stop
SEA11:35Seattle/Tacoma Intl
11 Oct
SEA06:23Seattle/Tacoma Intl
20h 07m
2 stops
BHD10:30Belfast City
£782

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 19 May 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

Mon 29/6

06:30-18:45

3 stops44h 15m

Seattle/Tacoma Intl

Mon 6/7

15:40-22:15

3 stops22h 35m

£748

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 15/10

06:30-18:25

1 stop19h 55m

Seattle/Tacoma Intl

Mon 19/10

20:20-18:45

1 stop14h 25m

£754

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/11

06:35-23:18

2 stops24h 43m

Seattle/Tacoma Intl

Sun 8/11

14:46-10:40

2 stops35h 54m

£756

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 15/10

12:45-18:25

1 stop13h 40m

Seattle/Tacoma Intl

Mon 19/10

11:34-15:30

2 stops19h 56m

£761

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 15/10

06:30-00:14

2 stops25h 44m

Seattle/Tacoma Intl

Mon 19/10

15:10-15:30

2 stops16h 20m

£765

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 29/6

06:30-18:45

3 stops44h 15m

Seattle/Tacoma Intl

Mon 6/7

19:00-22:35

2 stops19h 35m

£773
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 7/10

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Sun 11/10

06:23-10:30

2 stops20h 07m

£782

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sun 21/6

08:25-09:40

3 stops33h 15m

Seattle/Tacoma Intl

Sun 28/6

05:45-18:25

3 stops28h 40m

£795

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 7/10

10:05-00:15

2 stops22h 10m

Seattle/Tacoma Intl

Sun 11/10

06:23-10:30

2 stops20h 07m

£797

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 15/10

20:35-18:25

1 stop29h 50m

Seattle/Tacoma Intl

Mon 19/10

11:34-15:30

2 stops19h 56m

£801

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 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

24h 55m

Direct flights

None
The fastest flight from Northern Ireland to Seattle takes 24h 55m
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 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 £561Free CancellationRating
7.1
11,648 reviews
Search American Airlines flights

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Fife
Kirkland
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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