BOS - BFS

$325 Find Cheap Flights from Boston to Belfast Intl Airport

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 Intl 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 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
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Everything you should know

Cheapest round-trip
$595
Typical prices: $678-$601
Multiple Airlines
Thu 9/24Thu 10/22
BOS - BFS • 2 stops
Cheapest one-way
$325
Multiple Airlines
Mon 9/28
BOS - BFS • 3 stops
When to travel
Cheapest • 31% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
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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

Thu, Sep 24 - Thu, Oct 22
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
$595Multiple Airlines
Thu, Sep 17 - Thu, Oct 1
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
$696Multiple Airlines
Sun, Sep 13 - Mon, Sep 21
Multiple Airlines Logo
8:50 pm - 10:30 pm
BOS
-
BFS
20h 40m
3 stops
Multiple Airlines Logo
8:40 am - 2:45 pm
BFS
-
BOS
35h 05m
3 stops
$852Multiple Airlines
Sun, Sep 13 - Mon, Sep 21
Multiple Airlines Logo
8:50 pm - 9:50 pm
BOS
-
BFS
20h 00m
2 stops
Multiple Airlines Logo
8:40 am - 2:45 pm
BFS
-
BOS
35h 05m
3 stops
$862Multiple Airlines
Fri, Jun 5 - Thu, Jun 18
Multiple Airlines Logo
10:05 am - 9:50 pm
BOS
-
BFS
30h 45m
2 stops
Multiple Airlines Logo
8:05 pm - 8:55 pm
BFS
-
BOS
29h 50m
2 stops
$870Multiple Airlines
Thu, Sep 17 - Thu, Oct 1
Multiple Airlines Logo
11:00 pm - 11:00 pm
BOS
-
BFS
19h 00m
3 stops
Multiple Airlines Logo
2:50 pm - 8:20 pm
BFS
-
BOS
34h 30m
3 stops
$872Multiple Airlines
Fri, Jun 5 - Thu, Jun 18
Multiple Airlines Logo
5:50 am - 9:50 pm
BOS
-
BFS
35h 00m
3 stops
Multiple Airlines Logo
8:05 pm - 8:55 pm
BFS
-
BOS
29h 50m
2 stops
$885Multiple Airlines
Thu, Sep 24 - Thu, Oct 22
Multiple Airlines Logo
8:50 pm - 11:00 pm
BOS
-
BFS
21h 10m
3 stops
Multiple Airlines Logo
6:40 am - 8:20 pm
BFS
-
BOS
42h 40m
3 stops
$888Multiple Airlines
Thu, Sep 24 - Thu, Oct 22
Multiple Airlines Logo
8:50 pm - 11:05 pm
BOS
-
BFS
21h 15m
2 stops
Multiple Airlines Logo
10:15 am - 2:45 pm
BFS
-
BOS
33h 30m
2 stops
$914Multiple Airlines
Thu, Jun 11 - Thu, Jun 18
Multiple Airlines Logo
10:05 am - 6:55 pm
BOS
-
BFS
27h 50m
3 stops
Multiple Airlines Logo
8:05 pm - 8:55 pm
BFS
-
BOS
29h 50m
2 stops
$921Multiple 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.

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

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 Intl Airport departing in September.

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 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.

Good to know

Low seasonFebruary
Cheapest flight$325
Best time to beat the crowds with an average 32% drop in price.
Most popular time to fly and prices are also 24% 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 $325 for a one-way ticket and $595 for a round-trip.

  • 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.

  • 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 airline 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.
6.7
British AirwaysOverall score based on 7931 reviews
6.9Boarding
6.4Entertainment
6.8Comfort
7.7Crew
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 Intl

Information on your arrival and departure airports