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Cheap flights from Northern Ireland to Seattle from £348

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 1/10. 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
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
08:45 - 20:40
BHD
-
SEA
19h 55m
2 stops
Multiple Airlines Logo
19:00 - 20:30
SEA
-
BHD
17h 30m
2 stops
£700Multiple Airlines
Mon, 14 Sep - Sun, 20 Sep
Multiple Airlines Logo
08:15 - 20:40
BFS
-
SEA
20h 25m
2 stops
Multiple Airlines Logo
15:40 - 20:15
SEA
-
BFS
20h 35m
2 stops
£701Multiple Airlines
Mon, 14 Sep - Sun, 20 Sep
British Airways Logo
19:35 - 17:29
BHD
-
SEA
29h 54m
2 stops
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
£729British Airways
Mon, 14 Sep - Sun, 20 Sep
British Airways Logo
19:35 - 11:35
BHD
-
SEA
24h 00m
1 stop
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
£730British Airways
Mon, 14 Sep - Sun, 20 Sep
Multiple Airlines Logo
08:15 - 20:40
BFS
-
SEA
20h 25m
2 stops
Multiple Airlines Logo
15:40 - 22:35
SEA
-
BFS
22h 55m
3 stops
£731Multiple Airlines
Mon, 14 Sep - Sun, 20 Sep
British Airways Logo
11:35 - 00:36
BHD
-
SEA
21h 01m
2 stops
British Airways Logo
13:30 - 12:00
SEA
-
BHD
14h 30m
1 stop
£754British Airways
Wed, 13 May - Wed, 20 May
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
13:30 - 10:30
SEA
-
BHD
13h 00m
1 stop
£763British Airways
Wed, 14 Oct - Sun, 18 Oct
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
11:34 - 17:40
SEA
-
BHD
22h 06m
2 stops
£769British Airways
Wed, 14 Oct - Sun, 18 Oct
British Airways Logo
11:35 - 18:25
BHD
-
SEA
14h 50m
1 stop
British Airways Logo
13:30 - 12:00
SEA
-
BHD
14h 30m
1 stop
£773British Airways
Wed, 13 May - Wed, 20 May
Multiple Airlines Logo
20:55 - 18:32
BFS
-
SEA
29h 37m
3 stops
Multiple Airlines Logo
15:40 - 22:35
SEA
-
BFS
22h 55m
3 stops
£773Multiple Airlines
Mon, 14 Sep - Sun, 20 Sep

British Airways flights from Northern Ireland to Seattle

Our best British Airways deals on Northern Ireland to Seattle flight tickets
British Airways
14 Sept
BHD19:35Belfast City
29h 54m
2 stops
SEA17:29Seattle/Tacoma Intl
20 Sept
SEA20:20Seattle/Tacoma Intl
14h 25m
1 stop
BHD18:45Belfast City
£729
British Airways
14 Sept
BHD19:35Belfast City
24h 00m
1 stop
SEA11:35Seattle/Tacoma Intl
20 Sept
SEA20:20Seattle/Tacoma Intl
14h 25m
1 stop
BHD18:45Belfast City
£730
British Airways
13 May
BHD11:35Belfast City
21h 01m
2 stops
SEA00:36Seattle/Tacoma Intl
20 May
SEA13:30Seattle/Tacoma Intl
14h 30m
1 stop
BHD12:00Belfast City
£754

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 17 April 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

BHD - SEA

BHDSEA

Belfast City

Mon 14/9

08:45-20:40

2 stops19h 55m

Seattle/Tacoma Intl

Sun 20/9

19:00-20:30

2 stops17h 30m

£700

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 14/9

08:15-20:40

2 stops20h 25m

Seattle/Tacoma Intl

Sun 20/9

15:40-20:15

2 stops20h 35m

£701

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 14/9

19:35-17:29

2 stops29h 54m

Seattle/Tacoma Intl

Sun 20/9

20:20-18:45

1 stop14h 25m

£729

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 14/9

19:35-11:35

1 stop24h 00m

Seattle/Tacoma Intl

Sun 20/9

20:20-18:45

1 stop14h 25m

£730

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 14/9

08:15-20:40

2 stops20h 25m

Seattle/Tacoma Intl

Sun 20/9

15:40-22:35

3 stops22h 55m

£731

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 13/5

11:35-00:36

2 stops21h 01m

Seattle/Tacoma Intl

Wed 20/5

13:30-12:00

1 stop14h 30m

£754
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 14/10

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Sun 18/10

13:30-10:30

1 stop13h 00m

£763

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 14/10

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Sun 18/10

11:34-17:40

2 stops22h 06m

£769

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 13/5

11:35-18:25

1 stop14h 50m

Seattle/Tacoma Intl

Wed 20/5

13:30-12:00

1 stop14h 30m

£773

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 14/9

20:55-18:32

3 stops29h 37m

Seattle/Tacoma Intl

Sun 20/9

15:40-22:35

3 stops22h 55m

£773

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

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 £554Free CancellationRating
7.1
11,596 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
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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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