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Cheap flights from Northern Ireland to Seattle from £626

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from Northern Ireland to Seattle departing on 29/4. 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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Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
07:35 - 17:55
BFS
-
SEA
18h 20m
2 stops
Multiple Airlines Logo
19:00 - 17:05
SEA
-
BFS
14h 05m
2 stops
£626Multiple Airlines
Wed, 29 Apr - Wed, 6 May
Multiple Airlines Logo
07:35 - 17:55
BFS
-
SEA
18h 20m
2 stops
Multiple Airlines Logo
19:00 - 17:05
SEA
-
BFS
14h 05m
2 stops
£638Multiple Airlines
Wed, 29 Apr - Wed, 6 May
Multiple Airlines Logo
08:20 - 20:40
BFS
-
SEA
20h 20m
2 stops
Multiple Airlines Logo
19:00 - 20:55
SEA
-
BFS
17h 55m
2 stops
£669Multiple Airlines
Tue, 12 May - Tue, 19 May
Multiple Airlines Logo
07:00 - 20:40
BHD
-
SEA
21h 40m
2 stops
Multiple Airlines Logo
15:40 - 19:40
SEA
-
BHD
20h 00m
2 stops
£698Multiple Airlines
Wed, 29 Apr - Wed, 6 May
Multiple Airlines Logo
07:00 - 20:40
BHD
-
SEA
21h 40m
2 stops
Multiple Airlines Logo
15:40 - 19:40
SEA
-
BHD
20h 00m
2 stops
£698Multiple Airlines
Wed, 29 Apr - Wed, 6 May
KLM Logo
09:50 - 16:30
BHD
-
SEA
14h 40m
1 stop
KLM Logo
17:45 - 16:55
SEA
-
BHD
15h 10m
1 stop
£707KLM
Wed, 29 Apr - Wed, 6 May
British Airways Logo
11:35 - 18:25
BHD
-
SEA
14h 50m
1 stop
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
£724British Airways
Wed, 23 Sep - Sun, 27 Sep
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
06:24 - 10:30
SEA
-
BHD
20h 06m
2 stops
£727British Airways
Wed, 23 Sep - Sun, 27 Sep
KLM Logo
09:50 - 16:30
BHD
-
SEA
14h 40m
1 stop
KLM Logo
17:45 - 09:20
SEA
-
BHD
31h 35m
1 stop
£732KLM
Wed, 29 Apr - Wed, 6 May
British Airways Logo
10:05 - 21:09
BHD
-
SEA
19h 04m
2 stops
British Airways Logo
06:24 - 10:30
SEA
-
BHD
20h 06m
2 stops
£735British Airways
Wed, 23 Sep - Sun, 27 Sep

British Airways flights from Northern Ireland to Seattle

Our best British Airways deals on Northern Ireland to Seattle flight tickets
British Airways
23 Sept
BHD11:35Belfast City
14h 50m
1 stop
SEA18:25Seattle/Tacoma Intl
27 Sept
SEA20:20Seattle/Tacoma Intl
14h 25m
1 stop
BHD18:45Belfast City
£724
British Airways
23 Sept
BHD06:30Belfast City
13h 05m
1 stop
SEA11:35Seattle/Tacoma Intl
27 Sept
SEA06:24Seattle/Tacoma Intl
20h 06m
2 stops
BHD10:30Belfast City
£727
British Airways
23 Sept
BHD10:05Belfast City
19h 04m
2 stops
SEA21:09Seattle/Tacoma Intl
27 Sept
SEA06:24Seattle/Tacoma Intl
20h 06m
2 stops
BHD10:30Belfast City
£735

American Airlines flights from Northern Ireland to Seattle

Our best American Airlines deals on Northern Ireland to Seattle flight tickets
American Airlines
16 May
BHD07:05Belfast City
23h 33m
2 stops
SEA22:38Seattle/Tacoma Intl
18 May
SEA11:16Seattle/Tacoma Intl
20h 14m
2 stops
BHD15:30Belfast City
£3,687
American Airlines
15 May
BHD06:30Belfast City
26h 06m
2 stops
SEA00:36Seattle/Tacoma Intl
17 May
SEA11:16Seattle/Tacoma Intl
22h 24m
2 stops
BHD17:40Belfast City
£3,912
American Airlines
14 May
BHD06:30Belfast City
13h 05m
1 stop
SEA11:35Seattle/Tacoma Intl
18 May
SEA13:19Seattle/Tacoma Intl
18h 11m
2 stops
BHD15:30Belfast City
£4,352

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 1 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

BFS - SEA

BFSSEA

Belfast Intl

Wed 29/4

07:35-17:55

2 stops18h 20m

Seattle/Tacoma Intl

Wed 6/5

19:00-17:05

2 stops14h 05m

£626

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 29/4

07:35-17:55

2 stops18h 20m

Seattle/Tacoma Intl

Wed 6/5

19:00-17:05

2 stops14h 05m

£638

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 12/5

08:20-20:40

2 stops20h 20m

Seattle/Tacoma Intl

Tue 19/5

19:00-20:55

2 stops17h 55m

£669

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 29/4

07:00-20:40

2 stops21h 40m

Seattle/Tacoma Intl

Wed 6/5

15:40-19:40

2 stops20h 00m

£698

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 29/4

07:00-20:40

2 stops21h 40m

Seattle/Tacoma Intl

Wed 6/5

15:40-19:40

2 stops20h 00m

£698

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 29/4

09:50-16:30

1 stop14h 40m

Seattle/Tacoma Intl

Wed 6/5

17:45-16:55

1 stop15h 10m

£707
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 23/9

11:35-18:25

1 stop14h 50m

Seattle/Tacoma Intl

Sun 27/9

20:20-18:45

1 stop14h 25m

£724

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 23/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Sun 27/9

06:24-10:30

2 stops20h 06m

£727

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 29/4

09:50-16:30

1 stop14h 40m

Seattle/Tacoma Intl

Wed 6/5

17:45-09:20

1 stop31h 35m

£732

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 23/9

10:05-21:09

2 stops19h 04m

Seattle/Tacoma Intl

Sun 27/9

06:24-10:30

2 stops20h 06m

£735

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.
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 £568Free CancellationRating
7.1
11,545 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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