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Cheap flights from Northern Ireland to Seattle from £625

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 28/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap return flights

Enter your travel dates to find the best prices.
British Airways Logo
06:35 - 13:14
BHD
-
SEA
38h 39m2 stops
British Airways Logo
14:04 - 14:15
SEA
-
BHD
40h 11m2 stops
£625British Airways
Wed, 28 Jan - Sun, 1 Feb
British Airways Logo
06:35 - 13:14
BHD
-
SEA
38h 39m2 stops
British Airways Logo
14:04 - 14:15
SEA
-
BHD
40h 11m2 stops
£629British Airways
Wed, 28 Jan - Sun, 1 Feb
British Airways Logo
12:25 - 16:55
BHD
-
SEA
12h 30m1 stop
British Airways Logo
18:50 - 16:50
SEA
-
BHD
14h 00m1 stop
£651British Airways
Wed, 4 Feb - Sun, 8 Feb
British Airways Logo
11:25 - 16:55
BHD
-
SEA
13h 30m1 stop
British Airways Logo
18:50 - 18:40
SEA
-
BHD
15h 50m1 stop
£654British Airways
Wed, 4 Feb - Sun, 8 Feb
British Airways Logo
06:35 - 22:07
BHD
-
SEA
23h 32m2 stops
British Airways Logo
08:04 - 13:55
SEA
-
BHD
21h 51m2 stops
£659British Airways
Wed, 4 Feb - Sun, 8 Feb
British Airways Logo
06:35 - 22:07
BHD
-
SEA
23h 32m2 stops
British Airways Logo
08:04 - 13:55
SEA
-
BHD
21h 51m2 stops
£663British Airways
Wed, 4 Feb - Sun, 8 Feb
American Airlines Logo
14:50 - 11:30
BHD
-
SEA
28h 40m1 stop
American Airlines Logo
18:50 - 18:40
SEA
-
BHD
15h 50m1 stop
£713American Airlines
Fri, 9 Jan - Tue, 13 Jan
Delta Logo
17:20 - 22:25
BHD
-
SEA
37h 05m2 stops
Delta Logo
11:25 - 16:50
SEA
-
BHD
21h 25m2 stops
£743Delta
Fri, 9 Jan - Tue, 13 Jan
Multiple Airlines Logo
18:30 - 18:00
BFS
-
SEA
30h 30m3 stops
Multiple Airlines Logo
19:00 - 20:15
SEA
-
BFS
17h 15m3 stops
£778Multiple Airlines
Fri, 27 Mar - Wed, 8 Apr
Multiple Airlines Logo
10:00 - 19:17
BFS
-
SEA
41h 17m2 stops
Multiple Airlines Logo
18:25 - 18:50
SEA
-
BFS
16h 25m1 stop
£820Multiple Airlines
Fri, 9 Jan - Tue, 13 Jan

British Airways flights from Northern Ireland to Seattle

Our best British Airways deals on Northern Ireland to Seattle flight tickets
British Airways
28 Jan
BHD06:35Belfast City
38h 39m
2 stops
SEA13:14Seattle/Tacoma Intl
1 Feb
SEA14:04Seattle/Tacoma Intl
40h 11m
2 stops
BHD14:15Belfast City
£625
Find similar
British Airways
28 Jan
BHD06:35Belfast City
38h 39m
2 stops
SEA13:14Seattle/Tacoma Intl
1 Feb
SEA14:04Seattle/Tacoma Intl
40h 11m
2 stops
BHD14:15Belfast City
£629
Find similar
British Airways
4 Feb
BHD12:25Belfast City
12h 30m
1 stop
SEA16:55Seattle/Tacoma Intl
8 Feb
SEA18:50Seattle/Tacoma Intl
14h 00m
1 stop
BHD16:50Belfast City
£651
Find similar

American Airlines flights from Northern Ireland to Seattle

Our best American Airlines deals on Northern Ireland to Seattle flight tickets
American Airlines
9 Jan
BHD14:50Belfast City
28h 40m
1 stop
SEA11:30Seattle/Tacoma Intl
13 Jan
SEA18:50Seattle/Tacoma Intl
15h 50m
1 stop
BHD18:40Belfast City
£713
Find similar
American Airlines
27 Mar
BHD06:45Belfast City
12h 45m
1 stop
SEA12:30Seattle/Tacoma Intl
8 Apr
SEA13:35Seattle/Tacoma Intl
14h 20m
1 stop
BHD11:55Belfast City
£1,235
Find similar

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 5 December 2025.
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

BHD - SEA

BHDSEA

Belfast City

Wed 28/1

06:35-13:14

2 stops38h 39m

Seattle/Tacoma Intl

Sun 1/2

14:04-14:15

2 stops40h 11m

£625

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 28/1

06:35-13:14

2 stops38h 39m

Seattle/Tacoma Intl

Sun 1/2

14:04-14:15

2 stops40h 11m

£629

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

12:25-16:55

1 stop12h 30m

Seattle/Tacoma Intl

Sun 8/2

18:50-16:50

1 stop14h 00m

£651

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

11:25-16:55

1 stop13h 30m

Seattle/Tacoma Intl

Sun 8/2

18:50-18:40

1 stop15h 50m

£654

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

06:35-22:07

2 stops23h 32m

Seattle/Tacoma Intl

Sun 8/2

08:04-13:55

2 stops21h 51m

£659

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

06:35-22:07

2 stops23h 32m

Seattle/Tacoma Intl

Sun 8/2

08:04-13:55

2 stops21h 51m

£663

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Fri 9/1

14:50-11:30

1 stop28h 40m

Seattle/Tacoma Intl

Tue 13/1

18:50-18:40

1 stop15h 50m

£713

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Fri 9/1

17:20-22:25

2 stops37h 05m

Seattle/Tacoma Intl

Tue 13/1

11:25-16:50

2 stops21h 25m

£743

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 27/3

18:30-18:00

3 stops30h 30m

Seattle/Tacoma Intl

Wed 8/4

19:00-20:15

3 stops17h 15m

£778

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 9/1

10:00-19:17

2 stops41h 17m

Seattle/Tacoma Intl

Tue 13/1

18:25-18:50

1 stop16h 25m

£820

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

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 30m

Direct flights

None
The fastest flight from Northern Ireland to Seattle takes 12h 30m
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
British AirwaysPriceFrom £441Free CancellationRating
6.7
7,562 reviews
Search British Airways flights
American AirlinesPriceFrom £563Free CancellationRating
7.2
11,047 reviews
Search American Airlines flights

  • How do I get Price Alerts for flights from Northern Ireland to Seattle?

    You can take advantage of momondo’s Price Alerts by first searching for your flights to Northern Ireland from Seattle. Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.

  • How can I save money on flights from Northern Ireland to Seattle with momondo?

    With “Price Forecast”, learn how soon you should book your flight in advance. Down to the day of week and time of day, our information can inform you on the ideal time to book to save on your travel. Our “Price Calendar” shows you at a quick glance when to book your travel for lower rates. By setting “Price Alerts” you can monitor changes in price and target the ideal time to book. Search for your trip destination by budget amount via our “Explore” feature. Whether you’re looking for ideas for your next travel adventure or cost-cutting tips, our “Discover” content is a great place to start.

  • How does momondo find its flight prices?

    momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.

Travelling to a place near Seattle?

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