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Cheap flights from Northern Ireland to Seattle from £303

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 15/5. 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
08:20 - 20:40
BFS
-
SEA
20h 20m
2 stops
Multiple Airlines Logo
15:40 - 20:55
SEA
-
BFS
21h 15m
2 stops
£645Multiple Airlines
Tue, 14 Apr - Tue, 21 Apr
Multiple Airlines Logo
10:05 - 22:38
BHD
-
SEA
20h 33m
2 stops
Multiple Airlines Logo
13:35 - 12:00
SEA
-
BHD
14h 25m
1 stop
£650Multiple Airlines
Wed, 15 Apr - Wed, 22 Apr
Delta Logo
09:50 - 23:59
BHD
-
SEA
22h 09m
2 stops
Delta Logo
06:00 - 09:20
SEA
-
BHD
19h 20m
2 stops
£652Delta
Wed, 15 Apr - Wed, 22 Apr
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
13:35 - 13:35
SEA
-
BHD
16h 00m
1 stop
£657British Airways
Wed, 15 Apr - Wed, 22 Apr
British Airways Logo
19:25 - 12:30
BHD
-
SEA
24h 05m
1 stop
British Airways Logo
13:37 - 16:05
SEA
-
BHD
19h 28m
2 stops
£665British Airways
Mon, 16 Mar - Mon, 23 Mar
British Airways Logo
17:45 - 12:30
BHD
-
SEA
25h 45m
1 stop
British Airways Logo
19:50 - 16:05
SEA
-
BHD
13h 15m
1 stop
£669British Airways
Mon, 16 Mar - Mon, 23 Mar
Multiple Airlines Logo
08:20 - 22:53
BFS
-
SEA
22h 33m
3 stops
Multiple Airlines Logo
15:40 - 15:15
SEA
-
BFS
15h 35m
2 stops
£673Multiple Airlines
Tue, 14 Apr - Tue, 21 Apr
Multiple Airlines Logo
08:20 - 22:53
BFS
-
SEA
22h 33m
3 stops
Multiple Airlines Logo
15:40 - 19:50
SEA
-
BFS
20h 10m
3 stops
£677Multiple Airlines
Tue, 14 Apr - Tue, 21 Apr
British Airways Logo
19:25 - 00:24
BHD
-
SEA
35h 59m
2 stops
British Airways Logo
07:21 - 16:05
SEA
-
BHD
25h 44m
2 stops
£677British Airways
Mon, 16 Mar - Mon, 23 Mar
KLM Logo
17:30 - 11:15
BHD
-
SEA
25h 45m
2 stops
KLM Logo
09:30 - 09:20
SEA
-
BHD
15h 50m
2 stops
£777KLM
Tue, 7 Jul - Fri, 17 Jul

British Airways flights from Northern Ireland to Seattle

Our best British Airways deals on Northern Ireland to Seattle flight tickets
British Airways
15 Apr
BHD06:30Belfast City
13h 05m
1 stop
SEA11:35Seattle/Tacoma Intl
22 Apr
SEA13:35Seattle/Tacoma Intl
16h 00m
1 stop
BHD13:35Belfast City
£657
British Airways
16 Mar
BHD19:25Belfast City
24h 05m
1 stop
SEA12:30Seattle/Tacoma Intl
23 Mar
SEA13:37Seattle/Tacoma Intl
19h 28m
2 stops
BHD16:05Belfast City
£665
British Airways
16 Mar
BHD17:45Belfast City
25h 45m
1 stop
SEA12:30Seattle/Tacoma Intl
23 Mar
SEA19:50Seattle/Tacoma Intl
13h 15m
1 stop
BHD16:05Belfast City
£669

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 2 March 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

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 14/4

08:20-20:40

2 stops20h 20m

Seattle/Tacoma Intl

Tue 21/4

15:40-20:55

2 stops21h 15m

£645

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 15/4

10:05-22:38

2 stops20h 33m

Seattle/Tacoma Intl

Wed 22/4

13:35-12:00

1 stop14h 25m

£650

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 15/4

09:50-23:59

2 stops22h 09m

Seattle/Tacoma Intl

Wed 22/4

06:00-09:20

2 stops19h 20m

£652

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 15/4

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Wed 22/4

13:35-13:35

1 stop16h 00m

£657

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 16/3

19:25-12:30

1 stop24h 05m

Seattle/Tacoma Intl

Mon 23/3

13:37-16:05

2 stops19h 28m

£665

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 16/3

17:45-12:30

1 stop25h 45m

Seattle/Tacoma Intl

Mon 23/3

19:50-16:05

1 stop13h 15m

£669

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 14/4

08:20-22:53

3 stops22h 33m

Seattle/Tacoma Intl

Tue 21/4

15:40-15:15

2 stops15h 35m

£673

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 14/4

08:20-22:53

3 stops22h 33m

Seattle/Tacoma Intl

Tue 21/4

15:40-19:50

3 stops20h 10m

£677

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 16/3

19:25-00:24

2 stops35h 59m

Seattle/Tacoma Intl

Mon 23/3

07:21-16:05

2 stops25h 44m

£677

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 7/7

17:30-11:15

2 stops25h 45m

Seattle/Tacoma Intl

Fri 17/7

09:30-09:20

2 stops15h 50m

£777

Flights are sorted by cheapest return flights first.

Showing 1-10 of 17 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?

American Airlines 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

Fastest flight time

12h 55m

Direct flights

None
The fastest flight from Northern Ireland to Seattle takes 12h 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

  • 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 £560Free CancellationRating
7.1
11,375 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
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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