BOS - BFS

$536 Find Cheap Flights from Boston to Belfast Intl Airport

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boston to Belfast Intl departing on 1/7. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Belfast Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Boston to Belfast, 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 Boston to Belfast, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$536
Overall average: $768
Multiple Airlines
Wed 1/7Wed 1/14
BOS - BFS • 2 stops
Cheapest one-way
Multiple Airlines
Thu 12/11
BOS - BFS • multi-stop
When to travel
September
Cheapest • 26% price drop
September
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Belfast Intl!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Boston to Belfast Intl (BOS-BFS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Boston to Belfast Intl 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 Boston to Belfast Intl

Wed, Jan 7 - Wed, Jan 14
Multiple Airlines Logo
7:50 pm - 3:30 pm
BOS
-
BFS
14h 40m2 stops
Multiple Airlines Logo
8:20 am - 5:50 pm
BFS
-
BOS
14h 30m2 stops
$536Multiple Airlines
Sun, Feb 1 - Sat, Feb 7
Multiple Airlines Logo
7:50 pm - 6:25 pm
BOS
-
BFS
17h 35m2 stops
Multiple Airlines Logo
5:45 am - 2:35 pm
BFS
-
BOS
37h 50m3 stops
$665Multiple Airlines
Sun, Jan 25 - Sun, Feb 1
Multiple Airlines Logo
7:50 pm - 6:55 pm
BOS
-
BFS
18h 05m2 stops
Multiple Airlines Logo
5:45 am - 8:10 pm
BFS
-
BOS
19h 25m3 stops
$673Multiple Airlines
Sun, Feb 1 - Sat, Feb 7
Multiple Airlines Logo
6:05 pm - 9:55 pm
BOS
-
BFS
22h 50m3 stops
Multiple Airlines Logo
5:45 am - 2:35 pm
BFS
-
BOS
37h 50m3 stops
$678Multiple Airlines
Sun, Feb 1 - Sat, Feb 7
Multiple Airlines Logo
7:30 am - 9:40 am
BOS
-
BFS
21h 10m1 stop
Multiple Airlines Logo
1:10 pm - 2:20 pm
BFS
-
BOS
30h 10m1 stop
$687Multiple Airlines
Sun, Jan 25 - Sun, Feb 1
Multiple Airlines Logo
5:30 am - 8:45 pm
BOS
-
BFS
34h 15m3 stops
Multiple Airlines Logo
5:45 am - 2:35 pm
BFS
-
BOS
37h 50m3 stops
$702Multiple Airlines
Wed, Jan 7 - Wed, Jan 14
Multiple Airlines Logo
7:50 pm - 4:10 pm
BOS
-
BFS
15h 20m2 stops
Multiple Airlines Logo
6:00 am - 7:55 pm
BFS
-
BOS
42h 55m3 stops
$719Multiple Airlines
Sun, Jan 25 - Sun, Feb 1
Multiple Airlines Logo
7:50 pm - 6:55 pm
BOS
-
BFS
18h 05m2 stops
Multiple Airlines Logo
6:00 am - 5:50 pm
BFS
-
BOS
16h 50m2 stops
$754Multiple Airlines
Wed, Jan 7 - Wed, Jan 14
Multiple Airlines Logo
7:50 pm - 10:10 pm
BOS
-
BFS
21h 20m3 stops
Multiple Airlines Logo
6:00 am - 7:55 pm
BFS
-
BOS
42h 55m3 stops
$756Multiple Airlines
Sun, Feb 1 - Sat, Feb 7
Multiple Airlines Logo
5:10 pm - 1:10 pm
BOS
-
BFS
15h 00m2 stops
Multiple Airlines Logo
10:25 pm - 1:55 pm
BFS
-
BOS
20h 30m2 stops
$989Multiple Airlines
Booking Insights

KAYAK's insights & trends for Boston to Belfast Intl flights

Get data-powered insights and trends into flights from Boston to Belfast Intl to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Boston to Belfast Intl Airport?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Boston to Belfast Intl Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Boston to Belfast Intl Airport is September, where tickets cost $614 (return) on average. On the other hand, the most expensive months are November and December, where the average cost of round-trip tickets is $1,488 and $1,221 respectively.

Good to know

Low seasonNovember
Cheapest flight$536
Best time to beat the crowds but there is an average 78% increase in price.
Most popular time to fly and prices are also 27% lower on average.
Flight from Boston to Belfast Intl Airport

When to book flights from Boston to Belfast Intl

Are your dates flexible? Find out the best times to travel from Boston to Belfast Intl based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Boston to Belfast Intl Airport flights

  • What is the cheapest flight from Boston to Belfast Intl Airport?

    In the last 3 days, the lowest price for a flight from Boston to Belfast Intl Airport was $536 for a round-trip ticket.

  • Do I need a passport to fly between Boston and Belfast Intl Airport?

    Yes, you'll most likely have to show a valid passport before boarding the plane in Boston and on arrival in Belfast Intl Airport.

  • Which aircraft models fly most regularly from Boston to Belfast Intl Airport?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Boston to Belfast Intl Airport?

    oneworld is the only airline alliance operating flights between Boston and Belfast Intl Airport.

  • Which is the best airline for flights from Boston to Belfast, American Airlines or British Airways?

    The two airlines most popular with KAYAK users for flights from Boston to Belfast are American Airlines and British Airways. With an average price for the route of $694 and an overall rating of 7.2, American Airlines is the most popular choice. British Airways is also a great choice for the route, with an average price of $652 and an overall rating of 6.7.

  • How does KAYAK find such low prices on flights from Boston to Belfast Intl Airport?

    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 Boston to Belfast Intl Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Boston to Belfast Intl Airport?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Belfast Intl Airport from Boston 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 Boston to Belfast Intl Airport?

    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 to Belfast Intl Airport with an airline and back to Boston with another airline. Booking your flights between Boston and BFS can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Boston to Belfast Intl Airport?

    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 to Belfast Intl Airport from Boston up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from Boston to Belfast Intl

 
See real verified KAYAK customer reviews for airlines flying from Boston to Belfast. 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 Boston to Belfast Intl? 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.
7.2
American AirlinesOverall score based on 11048 reviews
8.0Crew
7.5Boarding
7.2Comfort
6.5Food
6.9Entertainment
Airline reviews

I got sick nothing contagious but distressing enough and the care I received on the flight was astounding.

8.0 ExcellentJamie, Dec 2025
BOS - DCA
Read more American Airlines reviews

I got sick nothing contagious but distressing enough and the care I received on the flight was astounding.

It was good..clean, comfy seat. Friendly warm welcoming crew. Was able to check my cabin luggage at the gate which I was able to pickup in a decent time from baggage claim. The app gave all updates from delays to baggage claim info. Overall smooth flight.

Disliked having to wait a little longer to disembark from the plan when we landed in London

Food should be better quality. Video screens have poor resolution and the library of movies is poor. The other airlines are much better.

The trip was smooth but the crew were very abrupt, snatching things before finished and being quite snappy when asked questions.

My wife and I love to travel, so we fly a lot. We've already logged 381,075 miles and with practically every major airline. But this flight was very disappointing. It started off well, with no delays and a new plane. But when lunchtime approached, all that good impression was ruined. Instead of white tablecloths, we were offered small, dark placemats, which, as it turned out, were perfectly adequate for the food. All the food offered—and my wife and I only took fish, and the meat—was not just bad, it was downright disgusting and not heated enough. The same applies to the appetizers. This was the first time in many years of traveling that we've been offered such disgusting food.

Lost luggage stuck no clothes and no word after 2 days leaving on cruise no stuff or clothes

Don’t know they cancelled the flight day before I was to leave. They sent a email at 9:00 pm at night saying they cancelled. That is the smooth way to say we don’t want your business! I think they didn’t have enough people booking so they cancelled the flight! It’s all about the money anymore there is no honesty in business.

The flight was canceled 3 hours after original take off time

Flight was cancelled 3 hrs AFTER etd. Thetefore Missed connection from JFK to New Zealand . No accommodation provided… This cost ne aporox 1000 USD in extra expenses and turned whst should have been a 24 hr trip ftom Boston - New Zealand into a VERY expensive , late 70+ hr nightmare … Complete nonsense!!!

Check in was was and the agent was very friendly and helpful The lounge was nice...boarding was straight from the lounge Everything worked at our seats, and video entertainment was good ..food was mediocre

The flight was excellent in World Travellor plus. Well worth the extra money. Boarding at Phoenix was the usual poorly organized event. Very stressful.

Although business class, the seating was really cramped. The food was so so.

Smooth trip no turbulence which is always a bonus for me lol! In cattle class so an element of being a bit squished (but not as bad as other shorter haul airlines) smaller plane than the one we flew out on and entertainment system wasn’t as modern but still definitely passed the time. Lovely crew x

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

Seat pitch is not enough to eat comfortably. When seat in front is reclined, your screen comes closer to your face. Ryanair seats are actually more comfortable.

The leg from Portland to Heathrow was great for a business class ticket. The BA leg from Heathrow to Lisbon was terrible. Basically coach seating with an empty seat between you and next passenger. Absolutely no leg room. Should not have been charged for business class and it was a 3 hour flight.

The flat beds. Other than that, the place was not clean.

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

I have always been pleased with their service. Would not change a thing

Everything you need to know for your flight from Boston to Belfast Intl

Information on your arrival and departure airports