$272 Find Cheap Flights from Boston to Belfast

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boston to Belfast departing on 5/17. 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

 
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
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Everything you should know

Cheapest round-trip
$575
British Airways
Wed 4/22Thu 4/30
BOS - BHD • 1 stop
Cheapest one-way
$272
Multiple Airlines
Sun 5/17
BOS - BFS • 2 stops
Top airlines
British Airways
Cheapest • from $575 (round-trip)
American Airlines
Best reviews • 7.2 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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Booking Insights
Flight Deals

Cheap Flights from Boston to Belfast (BOS-BHD)

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

Wed, Apr 22 - Thu, Apr 30
British Airways Logo
7:35 pm - 1:35 pm
BOS
-
BHD
13h 00m
1 stop
British Airways Logo
8:35 pm - 5:00 pm
BHD
-
BOS
25h 25m
1 stop
$575British Airways
Mon, Mar 9 - Mon, Mar 23
British Airways Logo
7:55 pm - 10:40 am
BOS
-
BHD
10h 45m
1 stop
British Airways Logo
5:45 pm - 3:16 pm
BHD
-
BOS
25h 31m
2 stops
$579British Airways
Mon, Mar 9 - Mon, Mar 23
British Airways Logo
3:49 pm - 10:40 am
BOS
-
BHD
14h 51m
2 stops
British Airways Logo
5:45 pm - 7:19 pm
BHD
-
BOS
29h 34m
2 stops
$581British Airways
Mon, Mar 9 - Mon, Mar 23
British Airways Logo
8:30 am - 9:05 am
BOS
-
BHD
20h 35m
1 stop
British Airways Logo
7:25 pm - 10:55 pm
BHD
-
BOS
31h 30m
1 stop
$586British Airways
Sun, Apr 26 - Mon, May 4
Delta Logo
4:35 pm - 9:20 am
BOS
-
BHD
11h 45m
1 stop
Delta Logo
9:50 am - 1:10 pm
BHD
-
BOS
32h 20m
1 stop
$592Delta
Sun, Apr 26 - Tue, May 5
Delta Logo
4:35 pm - 4:55 pm
BOS
-
BHD
19h 20m
1 stop
Delta Logo
9:50 am - 11:02 pm
BHD
-
BOS
18h 12m
2 stops
$602Delta
Sun, Apr 26 - Wed, May 6
Delta Logo
4:35 pm - 9:20 am
BOS
-
BHD
11h 45m
1 stop
Delta Logo
9:50 am - 11:02 pm
BHD
-
BOS
18h 12m
2 stops
$603Delta
Thu, Mar 19 - Mon, Mar 23
British Airways Logo
10:35 pm - 2:00 pm
BOS
-
BHD
11h 25m
1 stop
British Airways Logo
7:25 pm - 10:55 pm
BHD
-
BOS
31h 30m
1 stop
$621British Airways
Sat, Apr 25 - Tue, May 5
British Airways Logo
9:50 pm - 12:25 pm
BOS
-
BHD
9h 35m
1 stop
British Airways Logo
6:30 am - 4:55 pm
BHD
-
BOS
15h 25m
1 stop
$625British Airways
Sun, Apr 26 - Wed, May 6
Multiple Airlines Logo
11:00 pm - 6:50 pm
BOS
-
BFS
14h 50m
2 stops
Multiple Airlines Logo
9:35 am - 9:05 pm
BFS
-
BOS
16h 30m
1 stop
$718Multiple Airlines
Booking Insights

KAYAK's insights & trends for Boston to Belfast flights

Get data-powered insights and trends into flights from Boston to Belfast 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?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Boston to Belfast, 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 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

Cheapest flight$272
Flight from Boston to Belfast Intl Airport

When to book flights from Boston to Belfast

Are your dates flexible? Find out the best times to travel from Boston to Belfast 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 flights from Boston to Belfast

  • What is the cheapest flight from Boston to Belfast?

    In the last 3 days, the lowest price for a flight from Boston to Belfast was $272 for a one-way ticket and $575 for a round-trip.

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

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

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

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

  • Which airline alliances offer flights from Boston to Belfast?

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

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

    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.

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

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

    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 with an airline and back to Boston with another airline.

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

    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 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

 
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? 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 11213 reviews
6.4Food
7.5Boarding
8.0Crew
7.2Comfort
6.9Entertainment
Airline reviews

My flight to London from Philadelphia was cancelled due to weather.

6.0 GoodRicciyah, Jan 2026
PHL - LHR
Read more American Airlines reviews

My flight to London from Philadelphia was cancelled due to weather.

Enough space,crew was helpful,food was good.The gates are way far especially for travelers with health issues

After the door had been closed, the cockpit makes an announcement that catering is running late and it is not the airline's fault. It is their fault in the sense that we had to sit for 2 hours or more when we could have stayed in the terminal. Poor communications between catering and airline. This caused a young man to lose his temper and he went storming out hitting objects. He had complained to the gate agent that he had already waited at the gate 7 hours and when can the airplane leave? Airilnes do a poor job of explaining delays, maintenance issues, etc. whereas being truthful may gain more sympathy or understanding.

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

The issue was not with BA it was with the link yoiu sent fopr booking the flight

Loved the boarding option from Business class lounge, experience on flight was excellent, plenty of good food choices

The airline was not clear about a new departure time so we got to the airport early anyway. The flight left early which was great because of weather. The check in process was very easy and staff were friendly and helpful. The crew was great and our flight was very good.

Awful it always is unfortunately is the only way to fly direct to london

I travelled in business class and was disappointed by lack of service, curt and borderline rude time of the crew and to top it off, all of my luggage was delayed. It was like pulling teeth to even report the missing luggage and recover it the next day from the airport.

Boarding was poor. All groups called immediately one after the other resulting in a long queue in the jetty/jet bridge. Seats were very hard and and did not recline on a 4.5 hour flight. No food was available. Plane was cold. There was no entertainment.

The cramped seats are cruel and unusual punishment and may violate the Geneva code.

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.

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

Information on your arrival and departure airports