$377 Find Cheap Flights from Seattle to Northern Ireland - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Northern Ireland departing on 9/21. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Book Cheap Seattle to Northern Ireland Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Northern Ireland that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seattle to Northern Ireland

Mon, Oct 5 - Thu, Oct 22
British Airways Logo
1:30 pm - 12:55 pm
SEA
-
BHD
15h 25m
1 stop
British Airways Logo
12:45 pm - 6:25 pm
BHD
-
SEA
13h 40m
1 stop
$886British Airways
Mon, Oct 5 - Thu, Oct 22
British Airways Logo
1:30 pm - 12:55 pm
SEA
-
BHD
15h 25m
1 stop
British Airways Logo
12:45 pm - 6:25 pm
BHD
-
SEA
13h 40m
1 stop
$887British Airways
Tue, Aug 18 - Mon, Aug 31
Multiple Airlines Logo
7:00 pm - 10:15 pm
SEA
-
BFS
19h 15m
2 stops
Multiple Airlines Logo
9:25 pm - 9:40 am
BFS
-
SEA
44h 15m
3 stops
$903Multiple Airlines
Mon, Oct 5 - Thu, Oct 22
American Airlines Logo
3:20 pm - 3:30 pm
SEA
-
BHD
16h 10m
2 stops
American Airlines Logo
6:30 am - 11:35 am
BHD
-
SEA
13h 05m
1 stop
$907American Airlines
Mon, Oct 5 - Thu, Oct 22
American Airlines Logo
3:20 pm - 3:30 pm
SEA
-
BHD
16h 10m
2 stops
American Airlines Logo
6:30 am - 11:35 am
BHD
-
SEA
13h 05m
1 stop
$908American Airlines
Wed, Nov 11 - Tue, Nov 17
American Airlines Logo
1:53 pm - 2:35 pm
SEA
-
BHD
16h 42m
2 stops
American Airlines Logo
8:45 am - 4:55 pm
BHD
-
SEA
16h 10m
1 stop
$909American Airlines
Tue, Aug 18 - Mon, Aug 31
Multiple Airlines Logo
7:00 pm - 10:15 pm
SEA
-
BFS
19h 15m
2 stops
Multiple Airlines Logo
9:25 pm - 9:40 am
BFS
-
SEA
44h 15m
3 stops
$910Multiple Airlines
Mon, Oct 5 - Thu, Oct 22
British Airways Logo
10:31 am - 12:55 pm
SEA
-
BHD
18h 24m
2 stops
British Airways Logo
12:45 pm - 12:35 am
BHD
-
SEA
19h 50m
2 stops
$919British Airways
Mon, Oct 5 - Thu, Oct 22
British Airways Logo
10:31 am - 12:55 pm
SEA
-
BHD
18h 24m
2 stops
British Airways Logo
12:45 pm - 12:35 am
BHD
-
SEA
19h 50m
2 stops
$920British Airways
Mon, Aug 3 - Tue, Aug 18
British Airways Logo
8:20 pm - 5:30 pm
SEA
-
BHD
13h 10m
1 stop
British Airways Logo
8:25 pm - 6:25 pm
BHD
-
SEA
30h 00m
1 stop
$937British Airways
Booking Insights

KAYAK's insights & trends for Seattle to Northern Ireland flights

Get data-powered insights and trends into flights from Seattle to Northern Ireland to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Seattle to Northern Ireland?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 5 days.

In the past 5 days, the cheapest round-trip tickets from Seattle to Northern Ireland were found on British Airways ($887) and American Airlines ($908).

Good to know

Cheapest flight$377
Flight from Seattle to Belfast City Airport

FAQs - booking Northern Ireland flights

  • How does KAYAK find such low prices on flights from Seattle to Northern Ireland?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Northern Ireland.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Northern Ireland?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Seattle to Northern Ireland is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Northern Ireland?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Seattle to Northern Ireland with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Northern Ireland?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Seattle to Northern Ireland up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Seattle to Northern Ireland

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Northern Ireland. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to Northern Ireland? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
6.7
British AirwaysOverall score based on 8095 reviews
6.4Entertainment
7.7Crew
6.8Comfort
6.9Boarding
6.4Food
Airline reviews

Meh. Lived the seat. The entertainment unit did not work and had to be reset 3 times. Service was SLOW taking over 90 min to be served. Crew forgot about my meal. Chicken was dry and almost inedible.

6.0 GoodAnonymous, Jun 2026
SEA - LHR
Read more British Airways reviews

Meh. Lived the seat. The entertainment unit did not work and had to be reset 3 times. Service was SLOW taking over 90 min to be served. Crew forgot about my meal. Chicken was dry and almost inedible.

Flying on the Boeing 787 from Seattle to London was everything that I expected. Every thing was great.

Moved me away from my family and refused to fix it.

Connection at Hethrow was horrible..We couldn't get out of the plane for an hour as they were buying people to the airport and there were not enough busses. We had 2 and half hf between flights so it was very tight. After departing plane we had to go thru security again. People with less time in between connections missed their flights

Captain sick. Unable to get replacement so delayed me 30 hours, many others delayed 54 hours. TOTALLY DESTROYED ALL MY PLANS, including lost my rental car which would now cost over 5 times what I paid so stuck with buses n trains... lost hotel reservations.... HORRIBLE!!!

The BA business class cabin is excellent,very comfortable for sleeping but the service could be improved.

The flight from Seattle was delayed, which made me miss my connection to Florence. I was re-booked NINE HOURS LATER!!! That’s basically a vacation day lost. British Airways needs to partner with other airlines when possible to get a more realistic travel time, if delays occur. I realize there aren’t many flights to Florence from London, so I would book differently were I to return. The actual flight from Seattle was very comfortable and the crew was great, no faults there. I enjoy British Airways, this was an anomaly.

Could have done with a 2nd round of drinks even if it was only to distribute bottled water

The second leg of my flight unexpectedly got canceled. I was stuck at the airport for the whole day and instead of flying out that morning I flew out in the evening. For some of my fellow passengers it was the second cancellation and their original flight was supposed to go out the day before. There was no reason given though getting rebooked was quick even though I would have preferred if I would have been on one of the earlier flights that day. Compensation was a £10 voucher for some food at the airport. I eventually arrived without further incident but but due to the cancellation, it was one of my more frustrating travels of my life.

Due to a cyber attack at the SeaTac airport ALL of the airport computers at the airport were down. This seriously impacted every airline at the airport and the resulted in our flight leaving a hour later than scheduled. This delay caused us to miss our connecting flight from Heathrow to Edinburgh. I was amazed to have British Airways staff meet us at the gate as we left our flight. They quickly provided us with new boarding passes for a flight going to Edinburgh later the same day. Problems sometimes happen but they handled the situation in first class style.

Everything you need to know for your flight from Seattle to Northern Ireland

Information on your arrival and departure airports