$325 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 9/28. 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
$835
Typical prices: $655-$569
Multiple Airlines
Mon 8/31Wed 9/9
BOS - BFS • 2 stops
Cheapest one-way
$325
Multiple Airlines
Mon 9/28
BOS - BFS • 3 stops
Top airlines
Cheapest • from $892 (round-trip)
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, Aug 31 - Wed, Sep 9
Multiple Airlines Logo
11:00 pm - 8:40 pm
BOS
-
BFS
16h 40m
2 stops
Multiple Airlines Logo
9:35 am - 9:15 pm
BFS
-
BOS
16h 40m
1 stop
$835Multiple Airlines
Sun, Aug 30 - Wed, Sep 9
Multiple Airlines Logo
11:00 pm - 9:00 pm
BOS
-
BFS
17h 00m
2 stops
Multiple Airlines Logo
9:35 am - 9:15 pm
BFS
-
BOS
16h 40m
1 stop
$852Multiple Airlines
Wed, Oct 28 - Mon, Nov 2
Multiple Airlines Logo
8:20 pm - 4:50 pm
BOS
-
BHD
16h 30m
1 stop
Multiple Airlines Logo
7:20 am - 5:50 pm
BHD
-
BOS
15h 30m
2 stops
$865Multiple Airlines
Mon, Aug 31 - Thu, Sep 10
Multiple Airlines Logo
11:00 pm - 8:40 pm
BOS
-
BFS
16h 40m
2 stops
Multiple Airlines Logo
10:15 am - 9:15 pm
BFS
-
BOS
16h 00m
1 stop
$870Multiple Airlines
Sun, Aug 30 - Thu, Sep 10
Multiple Airlines Logo
11:00 pm - 9:00 pm
BOS
-
BFS
17h 00m
2 stops
Multiple Airlines Logo
10:15 am - 9:15 pm
BFS
-
BOS
16h 00m
1 stop
$887Multiple Airlines
Wed, Sep 2 - Wed, Sep 9
British Airways Logo
9:50 pm - 1:35 pm
BOS
-
BHD
10h 45m
1 stop
British Airways Logo
11:35 am - 8:05 pm
BHD
-
BOS
13h 30m
1 stop
$892British Airways
Thu, Sep 17 - Thu, Oct 1
British Airways Logo
7:40 pm - 10:10 am
BOS
-
BHD
9h 30m
1 stop
British Airways Logo
2:20 pm - 8:05 pm
BHD
-
BOS
10h 45m
1 stop
$895British Airways
Mon, Sep 28 - Mon, Oct 5
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
$896British Airways
Wed, Oct 28 - Mon, Nov 2
Multiple Airlines Logo
4:40 pm - 4:10 pm
BOS
-
BFS
19h 30m
2 stops
Multiple Airlines Logo
6:05 am - 5:50 pm
BFS
-
BOS
16h 45m
2 stops
$904Multiple Airlines
Wed, Oct 28 - Mon, Nov 2
Multiple Airlines Logo
8:50 pm - 9:45 pm
BOS
-
BFS
20h 55m
3 stops
Multiple Airlines Logo
6:05 am - 5:50 pm
BFS
-
BOS
16h 45m
2 stops
$907Multiple 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.

How much is a round-trip flight from Boston to Belfast?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Boston to Belfast departing in August.

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 $0 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $992 and $627 respectively.

Good to know

Cheapest flight$325
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 $325 for a one-way ticket and $835 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 7937 reviews
7.7Crew
6.8Comfort
6.4Entertainment
6.9Boarding
6.4Food
Airline reviews

Boarding was orderly, pilot and flight attendants were nice, entertainment options were good, and low sodium meals were quite tasty.

10.0 ExcellentAnonymous, Apr 2026
SFO - LHR
Read more British Airways reviews

Boarding was orderly, pilot and flight attendants were nice, entertainment options were good, and low sodium meals were quite tasty.

The whole experience was excellent, O can say out from Miami the best airline to travel with for any European destination. Since the ground staff to the inflight crew attention was great, service on board 10 of 10. Finally the 380 is very confortable and nice to travel.

All crew except 1 were excellent. When I asked assistance with business class seat conversion to a bed (not being familiar as never used before but have numerous times with other airlines) crew member helped very reluctantly. I should have told her that business class seat conversion is totally different in each airline such as Delta, New Zealand Air and United. Sorry it was my 1st time with America Airlines. Now I know, I won't bother asking assistance in future.

The seats in Premier Economy were very comfortable. The food was better than average. The way British Airways handled our seating was atrocious.

Flight delayed, connection was not at gate listed and so missed, staff were rude at Heathrow, phone tree stupid and difficult, took me 21 actual hours to reach my destination. Almost lost my hotel reservation after walking in a strange city alone after midnight because they would not put me up in a hotel at sfo or heathrow. I will never fly BA again and will tell all people and Instagram followers never to fly BA.

Overall ok. Best part has always been the sundae dessert.

I’ve never been on a trans-Atlantic (or Pacific) flight where the seats don’t recline—not even a little. I asked my seat mate when BA starting doing this and he said “Oh, a few years ago.” I couldn’t sleep, with my head falling forward waking me continuously, and came off the plane incredibly stiff. I booked a Premium Economy seat to get a more comfortable seat, which was worse than most basic Economy seats I’ve ever booked.

Nice aircraft. Good crew. Delayed departure from Houston, but arrived on time in London. Main thing I don’t like about flying BA is having to transit through security in London Heathrow. A major pain!

The gate agent made me check my carry-on in Denver, even though I've traveled all over taking this case on the plane. Beware folks. Food in Premium Economy was quite good - excellent blanket! Flight attendants on the Heathrow-to-Budapest flight on 3-27-2026 were quite snappy. I got a frown when asked to unscrew the water bottle cap for me (I had a cast on my right arm). Also woke up right when they were handing out biscuits. She had given my rowmates one and was in the process of giving water when I asked for a biscuit. She scolded me and said, "You snooze, you lose". She did give me one, but I thought that comment was uncalled for.

Wish the food and overall service was better. They treat Business class passengers same as economy

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

Information on your arrival and departure airports