$294 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 9/8. 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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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$617
Overall average: $662
Multiple Airlines
Mon 4/13Wed 4/29
BOS - BFS • 2 stops
Cheapest one-way
$294
British Airways
Tue 9/8
BOS - BHD • 2 stops
Top airlines
British Airways
Cheapest • from $700 (round-trip)
British Airways
Best reviews • 6.7 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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Flight Deals
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

Mon, Apr 13 - Wed, Apr 29
Multiple Airlines Logo
11:00 pm - 8:25 pm
BOS
-
BFS
16h 25m
2 stops
Multiple Airlines Logo
7:00 am - 9:45 pm
BFS
-
BOS
43h 45m
2 stops
$617Multiple Airlines
Mon, Apr 27 - Mon, May 4
Multiple Airlines Logo
11:00 pm - 8:25 pm
BOS
-
BFS
16h 25m
2 stops
Multiple Airlines Logo
6:10 am - 9:45 pm
BFS
-
BOS
20h 35m
2 stops
$643Multiple Airlines
Mon, Apr 13 - Wed, Apr 29
Multiple Airlines Logo
11:00 pm - 8:30 pm
BOS
-
BHD
16h 30m
2 stops
Multiple Airlines Logo
7:00 am - 9:45 pm
BHD
-
BOS
43h 45m
2 stops
$647Multiple Airlines
Wed, Apr 29 - Wed, May 6
Multiple Airlines Logo
6:05 pm - 3:35 pm
BOS
-
BFS
16h 30m
2 stops
Multiple Airlines Logo
6:10 am - 8:20 pm
BFS
-
BOS
19h 10m
2 stops
$687Multiple Airlines
Mon, May 4 - Wed, May 13
British Airways Logo
9:50 pm - 12:55 pm
BOS
-
BHD
10h 05m
1 stop
British Airways Logo
11:35 am - 5:00 pm
BHD
-
BOS
10h 25m
1 stop
$700British Airways
Mon, May 4 - Wed, May 13
British Airways Logo
3:05 pm - 12:55 pm
BOS
-
BHD
16h 50m
2 stops
British Airways Logo
11:35 am - 5:00 pm
BHD
-
BOS
10h 25m
1 stop
$713British Airways
Mon, May 4 - Wed, May 13
British Airways Logo
3:05 pm - 12:55 pm
BOS
-
BHD
16h 50m
2 stops
British Airways Logo
11:35 am - 11:52 pm
BHD
-
BOS
17h 17m
2 stops
$723British Airways
Thu, May 14 - Mon, May 18
Multiple Airlines Logo
8:50 pm - 11:30 pm
BOS
-
BFS
21h 40m
2 stops
Multiple Airlines Logo
7:00 am - 6:50 pm
BFS
-
BOS
40h 50m
2 stops
$731Multiple Airlines
Sun, May 3 - Sun, May 10
British Airways Logo
9:55 pm - 6:45 pm
BOS
-
BHD
15h 50m
1 stop
British Airways Logo
3:50 pm - 10:35 pm
BHD
-
BOS
11h 45m
1 stop
$758British Airways
Sun, May 3 - Sun, May 10
American Airlines Logo
8:10 pm - 5:40 pm
BOS
-
BHD
16h 30m
1 stop
American Airlines Logo
1:10 pm - 11:52 pm
BHD
-
BOS
15h 42m
2 stops
$778American 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 February, where tickets cost $542 (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.

Find deals

Good to know

Cheapest flight$294
Flight from Boston to Belfast City 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 $294 for a one-way ticket and $617 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 airline 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.
6.7
British AirwaysOverall score based on 7797 reviews
7.6Crew
6.4Entertainment
6.9Boarding
6.8Comfort
6.4Food
Airline reviews

Very please with the seating that the Kayak staff booked for us!

10.0 ExcellentAimee, Mar 2026
ATL - LHR
Read more British Airways reviews

Very please with the seating that the Kayak staff booked for us!

Worth every penny to upgrade to BC. Treated and felt more like First Class

Good service, food and comfort in World Traveller Plus. Entertainment was poor - no wifi on the way out and barely working on the way back. Not a great choice of entertainment on the seat back tv.

They had us seating down for one hour just waiting on the plane

Flying with BA is always a good experience—even in economy class. It is better if in business and first class. Timely, breeze through security and timely connections

We waited at BOS at the gate for an hour and couldn’t get a drink or anything. Once in the air the service, food and ride was excellent.

My enetertainmnet screen was broken. Lost my bags. Almost missed my flight do to connection issues with (despite a request) ZERO help from crew. Food was edible. Potatoes pretty good even

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.

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

Information on your arrival and departure airports

Boston (BOS)