$844 Find Cheap Flights from Seattle to Northern Ireland

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Northern Ireland departing on 6/11. 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.
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KAYAK searches hundreds of travel sites at once for deals on flights to Northern Ireland

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Northern Ireland, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Northern Ireland, as well as popular online travel agencies
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Best Northern Ireland Flight Deals from Seattle

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

Belfast
Belfast2 stops$844
Belfast
Belfast2 stops$844

Cheap Flights from Seattle to Northern Ireland

 
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.

Recent round-trip flight deals from Seattle to Northern Ireland

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Seattle to Northern Ireland.
Discover the best prices for you by selecting your travel dates on KAYAK.
 Logo
7:05 am - 6:35 pmSEA-BFS
27h 30m2 stops
 Logo
5:05 pm - 10:16 pmBFS-SEA
37h 11m3 stops
Wed, Jun 11 - Wed, Jun 18
 Logo
3:45 pm - 3:00 pmSEA-BFS
15h 15m2 stops
 Logo
9:00 am - 8:40 pmBFS-SEA
19h 40m2 stops
Tue, Jun 10 - Tue, Jun 17
 Logo
7:05 am - 6:35 pmSEA-BFS
27h 30m2 stops
 Logo
5:05 pm - 8:28 pmBFS-SEA
35h 23m2 stops
Wed, Jun 11 - Wed, Jun 18
 Logo
10:00 am - 6:35 pmSEA-BFS
24h 35m3 stops
 Logo
5:05 pm - 10:16 pmBFS-SEA
37h 11m3 stops
Wed, Jun 11 - Wed, Jun 18
Aer Lingus Logo
7:35 pm - 7:25 pmSEA-BHD
15h 50m2 stops
Aer Lingus Logo
7:00 am - 5:50 pmBHD-SEA
18h 50m2 stops
$1,010Aer Lingus
Find Deal
Tue, Jun 3 - Tue, Jun 10
Aer Lingus Logo
7:35 pm - 8:50 amSEA-BHD
29h 15m2 stops
Aer Lingus Logo
7:25 pm - 5:50 pmBHD-SEA
30h 25m2 stops
$1,067Aer Lingus
Find Deal
Thu, May 29 - Thu, Jun 5
British Airways Logo
8:20 pm - 7:25 pmSEA-BHD
15h 05m1 stop
British Airways Logo
6:35 am - 11:10 amBHD-SEA
12h 35m1 stop
$1,116British Airways
Find Deal
Tue, Jun 3 - Tue, Jun 10
British Airways Logo
6:20 am - 10:35 amSEA-BHD
20h 15m2 stops
British Airways Logo
6:35 am - 11:10 amBHD-SEA
12h 35m1 stop
$1,150British Airways
Find Deal
Tue, Jun 3 - Tue, Jun 10
KLM Logo
5:35 pm - 4:55 pmSEA-BHD
15h 20m1 stop
KLM Logo
5:25 pm - 3:55 pmBHD-SEA
30h 30m1 stop
$1,482KLM
Find Deal
Sat, Jun 14 - Sat, Jun 21
KLM Logo
1:55 pm - 4:55 pmSEA-BHD
19h 00m1 stop
KLM Logo
5:25 pm - 11:35 amBHD-SEA
26h 10m1 stop
$3,754KLM
Find Deal
Sun, Jun 29 - Thu, Jul 10
Useful Info

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 72 hours.

In the past 3 days, the cheapest round-trip tickets from Seattle to Northern Ireland were found on Aer Lingus ($1,010) and British Airways ($1,116).


Good to know

Low seasonOctober
High seasonJuly
Cheapest flight$844
Best time to beat the crowds with an average 40% drop in price.
Most popular time to fly with an average 21% increase in price.
Flight from Seattle to Belfast Intl 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.

  • What is the cheapest time of day to fly to Northern Ireland?

    The cheapest time of day to fly to Northern Ireland is generally in the afternoon, when round-trip flights cost $794 on average. Morning departures are around 100% cheaper than evening flights, on average. The most expensive time of day to fly to Northern Ireland is generally in the evening, which is peak travel time and where the average cost of a ticket is $1,000.

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.
6.6
British AirwaysOverall score based on 6837 reviews
6.4Entertainment
7.6Crew
6.8Boarding
6.3Food
6.7Comfort
Airline reviews

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.

6.0 GoodAnonymous, Apr 2025SEA - LHR
Read more British Airways reviews

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.

The crew could not have been more helpful, my meal was excellent, I slept peacefully until right before landing, and the BA lounge was a godsend. The only negative I encountered was the coffee both on the plane and in the lounge. Not to my taste but that’s a personal preference.

I don’t understand why a reputable airline like BA would delegate their London flights to AA. Makes no sense to me, as most domestic carriers do such a poor job these days. Terminal 3 at LHR is a total dump

Cancelled flight minutes before boarding. Rescheduled flight was two days later

The flight attendants were EXTREMELY personable and appreciated the service, lights going off after dinner (probably the norm, but I haven’t flown evening overnight flights in a while). Thank you!

Business class seats were very dated on my plane. Very little storage, charging ports were not easily accessible, tv screen kept flopping away. Vegetarian food was disappointing: hardly any protein and severely under-seasoned. Crew was lovely.

The food was ok, but not great. They delayed boarding in Portland and did not enforce group boarding. But the crew was excellent, went above and beyond.

The food was pathetic. There wasn't much leg room and recline space for such a long flight. No tea/ coffee for a 2-3 hour connecting flight without purchasing! Really!?

Service was very good. Because I use a cane, I was allowed to use Priority Boarding. Biggest problem was extremely limited leg room in Economy class seats. For airplane food, it was alright.

Was late but that airport/storm fault. Flight was full but comfortable. Food quite nice. Unfortunate that I had a rather miserable attendant, others were much friendlier

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

Information on your arrival and departure airports

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