Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from Northern Ireland to Seattle from £388

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 25/8. 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

Discover deals from 900+ travel sites with momondo.

Voted winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

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 - 20:40
BFS
-
SEA
22h 30m
2 stops
Multiple Airlines Logo
15:40 - 19:40
SEA
-
BFS
20h 00m
2 stops
£710Multiple Airlines
Wed, 24 Jun - Wed, 1 Jul
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
20:20 - 19:40
SEA
-
BHD
15h 20m
1 stop
£715British Airways
Tue, 1 Sep - Tue, 22 Sep
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
20:20 - 19:40
SEA
-
BHD
15h 20m
1 stop
£716British Airways
Tue, 6 Oct - Tue, 20 Oct
British Airways Logo
09:40 - 20:52
BHD
-
SEA
19h 12m
2 stops
British Airways Logo
20:20 - 17:35
SEA
-
BHD
13h 15m
1 stop
£719British Airways
Tue, 1 Sep - Tue, 22 Sep
Multiple Airlines Logo
09:40 - 00:14
BHD
-
SEA
22h 34m
2 stops
Multiple Airlines Logo
11:34 - 15:20
SEA
-
BHD
19h 46m
2 stops
£720Multiple Airlines
Tue, 6 Oct - Tue, 20 Oct
Multiple Airlines Logo
06:15 - 15:40
BFS
-
SEA
17h 25m
2 stops
Multiple Airlines Logo
18:05 - 22:25
SEA
-
BFS
20h 20m
2 stops
£729Multiple Airlines
Tue, 23 Jun - Tue, 30 Jun
British Airways Logo
09:15 - 16:55
BHD
-
SEA
15h 40m
1 stop
British Airways Logo
11:42 - 10:40
SEA
-
BHD
38h 58m
2 stops
£749British Airways
Wed, 4 Nov - Sun, 8 Nov
British Airways Logo
06:35 - 23:18
BHD
-
SEA
24h 43m
2 stops
British Airways Logo
14:46 - 10:40
SEA
-
BHD
35h 54m
2 stops
£749British Airways
Wed, 4 Nov - Sun, 8 Nov
British Airways Logo
06:35 - 16:55
BHD
-
SEA
18h 20m
1 stop
British Airways Logo
14:46 - 14:15
SEA
-
BHD
39h 29m
2 stops
£750British Airways
Wed, 4 Nov - Sun, 8 Nov
British Airways Logo
06:35 - 16:55
BHD
-
SEA
18h 20m
1 stop
British Airways Logo
11:42 - 10:40
SEA
-
BHD
38h 58m
2 stops
£751British Airways
Wed, 4 Nov - Sun, 8 Nov

British Airways flights from Northern Ireland to Seattle

Our best British Airways deals on Northern Ireland to Seattle flight tickets
British Airways
1 Sept
BHD06:30Belfast City
13h 05m
1 stop
SEA11:35Seattle/Tacoma Intl
22 Sept
SEA20:20Seattle/Tacoma Intl
15h 20m
1 stop
BHD19:40Belfast City
£715
British Airways
6 Oct
BHD06:30Belfast City
13h 05m
1 stop
SEA11:35Seattle/Tacoma Intl
20 Oct
SEA20:20Seattle/Tacoma Intl
15h 20m
1 stop
BHD19:40Belfast City
£716
British Airways
1 Sept
BHD09:40Belfast City
19h 12m
2 stops
SEA20:52Seattle/Tacoma Intl
22 Sept
SEA20:20Seattle/Tacoma Intl
13h 15m
1 stop
BHD17:35Belfast City
£719

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 12 May 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 24/6

06:10-20:40

2 stops22h 30m

Seattle/Tacoma Intl

Wed 1/7

15:40-19:40

2 stops20h 00m

£710
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 1/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Tue 22/9

20:20-19:40

1 stop15h 20m

£715

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 6/10

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Tue 20/10

20:20-19:40

1 stop15h 20m

£716

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 1/9

09:40-20:52

2 stops19h 12m

Seattle/Tacoma Intl

Tue 22/9

20:20-17:35

1 stop13h 15m

£719

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 6/10

09:40-00:14

2 stops22h 34m

Seattle/Tacoma Intl

Tue 20/10

11:34-15:20

2 stops19h 46m

£720

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 23/6

06:15-15:40

2 stops17h 25m

Seattle/Tacoma Intl

Tue 30/6

18:05-22:25

2 stops20h 20m

£729

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/11

09:15-16:55

1 stop15h 40m

Seattle/Tacoma Intl

Sun 8/11

11:42-10:40

2 stops38h 58m

£749

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/11

06:35-23:18

2 stops24h 43m

Seattle/Tacoma Intl

Sun 8/11

14:46-10:40

2 stops35h 54m

£749

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/11

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Sun 8/11

14:46-14:15

2 stops39h 29m

£750

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/11

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Sun 8/11

11:42-10:40

2 stops38h 58m

£751

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 and Aer Lingus 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

16h 50m

Direct flights

None
The fastest flight from Northern Ireland to Seattle takes 16h 50m
There are no direct flights from Northern Ireland to Seattle. There are no popular flight routes from Northern Ireland to Seattle.
Search flight deals

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 £552Free CancellationRating
7.1
11,661 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
Kirkland
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.

An easier way to manage your Seattle trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Thu 11/6
Thu 18/6
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States