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Cheap flights from Northern Ireland to Seattle from £596

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 7/5. 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
1 adult, Economy, 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
06:10 - 17:55
BFS
-
SEA
19h 45m
2 stops
Multiple Airlines Logo
19:00 - 20:35
SEA
-
BFS
17h 35m
2 stops
£596Multiple Airlines
Thu, 7 May - Thu, 14 May
British Airways Logo
10:05 - 18:25
BHD
-
SEA
16h 20m
1 stop
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
£725British Airways
Wed, 22 Apr - Sun, 26 Apr
British Airways Logo
11:35 - 00:36
BHD
-
SEA
21h 01m
2 stops
British Airways Logo
20:20 - 20:35
SEA
-
BHD
16h 15m
1 stop
£728British Airways
Wed, 6 May - Sun, 10 May
British Airways Logo
09:35 - 17:29
BHD
-
SEA
39h 54m
2 stops
British Airways Logo
06:24 - 12:55
SEA
-
BHD
22h 31m
2 stops
£729British Airways
Fri, 11 Sep - Mon, 14 Sep
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
13:30 - 19:40
SEA
-
BHD
22h 10m
1 stop
£733British Airways
Fri, 8 May - Tue, 12 May
British Airways Logo
19:35 - 22:38
BHD
-
SEA
35h 03m
2 stops
British Airways Logo
13:30 - 15:20
SEA
-
BHD
17h 50m
1 stop
£737British Airways
Fri, 8 May - Tue, 12 May
British Airways Logo
10:05 - 22:47
BHD
-
SEA
20h 42m
2 stops
British Airways Logo
13:30 - 13:25
SEA
-
BHD
15h 55m
1 stop
£737British Airways
Wed, 22 Apr - Sun, 26 Apr
British Airways Logo
10:05 - 21:22
BHD
-
SEA
19h 17m
2 stops
British Airways Logo
12:34 - 08:50
SEA
-
BHD
36h 16m
2 stops
£752British Airways
Wed, 22 Apr - Sun, 26 Apr
British Airways Logo
11:35 - 11:35
BHD
-
SEA
32h 00m
1 stop
British Airways Logo
20:20 - 17:40
SEA
-
BHD
13h 20m
1 stop
£753British Airways
Wed, 6 May - Sun, 10 May
Multiple Airlines Logo
08:30 - 17:15
BFS
-
SEA
40h 45m
3 stops
Multiple Airlines Logo
19:10 - 21:30
SEA
-
BFS
18h 20m
2 stops
£901Multiple Airlines
Wed, 5 Aug - Sun, 16 Aug

British Airways flights from Northern Ireland to Seattle

Our best British Airways deals on Northern Ireland to Seattle flight tickets
British Airways
22 Apr
BHD10:05Belfast City
16h 20m
1 stop
SEA18:25Seattle/Tacoma Intl
26 Apr
SEA20:20Seattle/Tacoma Intl
14h 25m
1 stop
BHD18:45Belfast City
£725
British Airways
6 May
BHD11:35Belfast City
21h 01m
2 stops
SEA00:36Seattle/Tacoma Intl
10 May
SEA20:20Seattle/Tacoma Intl
16h 15m
1 stop
BHD20:35Belfast City
£728
British Airways
11 Sept
BHD09:35Belfast City
39h 54m
2 stops
SEA17:29Seattle/Tacoma Intl
14 Sept
SEA06:24Seattle/Tacoma Intl
22h 31m
2 stops
BHD12:55Belfast City
£729

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 25 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

Cheapest return flight

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 7/5

06:10-17:55

2 stops19h 45m

Seattle/Tacoma Intl

Thu 14/5

19:00-20:35

2 stops17h 35m

£596
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 22/4

10:05-18:25

1 stop16h 20m

Seattle/Tacoma Intl

Sun 26/4

20:20-18:45

1 stop14h 25m

£725

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 6/5

11:35-00:36

2 stops21h 01m

Seattle/Tacoma Intl

Sun 10/5

20:20-20:35

1 stop16h 15m

£728

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Fri 11/9

09:35-17:29

2 stops39h 54m

Seattle/Tacoma Intl

Mon 14/9

06:24-12:55

2 stops22h 31m

£729

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Fri 8/5

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Tue 12/5

13:30-19:40

1 stop22h 10m

£733

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Fri 8/5

19:35-22:38

2 stops35h 03m

Seattle/Tacoma Intl

Tue 12/5

13:30-15:20

1 stop17h 50m

£737

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 22/4

10:05-22:47

2 stops20h 42m

Seattle/Tacoma Intl

Sun 26/4

13:30-13:25

1 stop15h 55m

£737

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 22/4

10:05-21:22

2 stops19h 17m

Seattle/Tacoma Intl

Sun 26/4

12:34-08:50

2 stops36h 16m

£752

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 6/5

11:35-11:35

1 stop32h 00m

Seattle/Tacoma Intl

Sun 10/5

20:20-17:40

1 stop13h 20m

£753

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 5/8

08:30-17:15

3 stops40h 45m

Seattle/Tacoma Intl

Sun 16/8

19:10-21:30

2 stops18h 20m

£901

Flights are sorted by cheapest return flights first.

Showing 1-10 of 13 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

19h 45m

Direct flights

None
The fastest flight from Northern Ireland to Seattle takes 19h 45m
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
11,494 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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