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Cheap flights from Boston to Belfast from $272

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Boston to Belfast departing on 9/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Boston to Belfast

Cheap round-trip flights

Logo
8:00 pm - 9:30 pmBOS-BFS
20h 30m2 stops
Logo
8:55 am - 5:45 pmBFS-BOS
37h 50m2 stops
$582
Find Deal
Tue, Nov 25 - Sun, Nov 30
Logo
8:50 pm - 8:05 pmBOS-BFS
18h 15m2 stops
Logo
9:05 pm - 10:00 pmBFS-BOS
29h 55m2 stops
$654
Find Deal
Fri, Sep 12 - Fri, Sep 19
Logo
6:40 pm - 11:20 amBOS-BFS
11h 40m2 stops
Logo
10:55 pm - 6:10 pmBFS-BOS
24h 15m2 stops
$664
Find Deal
Mon, Aug 18 - Tue, Sep 2
Logo
7:10 pm - 2:20 pmBOS-BFS
14h 10m1 stop
Logo
7:25 am - 9:39 amBFS-BOS
31h 14m2 stops
$667
Find Deal
Mon, Aug 18 - Tue, Sep 2
Logo
7:15 pm - 10:30 pmBOS-BFS
22h 15m2 stops
Logo
9:05 pm - 2:20 pmBFS-BOS
46h 15m3 stops
$672
Find Deal
Sat, Sep 13 - Sat, Sep 20
Logo
12:15 pm - 11:20 amBOS-BFS
18h 05m3 stops
Logo
7:00 am - 8:05 pmBFS-BOS
42h 05m3 stops
$683
Find Deal
Mon, Aug 18 - Tue, Sep 2
Logo
6:05 pm - 6:50 pmBOS-BFS
19h 45m2 stops
Logo
11:15 pm - 2:35 pmBFS-BOS
44h 20m3 stops
$691
Find Deal
Tue, Nov 25 - Sun, Nov 30
Logo
6:40 pm - 11:20 amBOS-BFS
11h 40m2 stops
Logo
10:55 pm - 6:10 pmBFS-BOS
24h 15m2 stops
$695
Find Deal
Mon, Aug 18 - Tue, Sep 2
Logo
8:50 pm - 8:05 pmBOS-BFS
18h 15m2 stops
Logo
6:05 am - 11:35 amBFS-BOS
34h 30m2 stops
$697
Find Deal
Fri, Sep 12 - Fri, Sep 19
Logo
6:55 pm - 12:50 pmBOS-BFS
12h 55m1 stop
Logo
6:25 pm - 8:55 pmBFS-BOS
31h 30m2 stops
$708
Find Deal
Wed, Nov 26 - Sun, Nov 30

momondo Fare Finder

 
Customize your flight search to find flights from Boston to Belfast Intl Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated July 31, 2025.
Use the filters below to find and compare flights from Boston to Belfast Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Tue 11/25

8:00 pm-9:30 pm

2 stops20h 30m

Belfast Intl

Sun 11/30

8:55 am-5:45 pm

2 stops37h 50m

$582

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Fri 9/12

8:50 pm-8:05 pm

2 stops18h 15m

Belfast Intl

Fri 9/19

9:05 pm-10:00 pm

2 stops29h 55m

$654

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Mon 8/18

6:40 pm-11:20 am

2 stops11h 40m

Belfast Intl

Tue 9/2

10:55 pm-6:10 pm

2 stops24h 15m

$664

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Mon 8/18

7:10 pm-2:20 pm

1 stop14h 10m

Belfast Intl

Tue 9/2

7:25 am-9:39 am

2 stops31h 14m

$667

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Sat 9/13

7:15 pm-10:30 pm

2 stops22h 15m

Belfast Intl

Sat 9/20

9:05 pm-2:20 pm

3 stops46h 15m

$672

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Mon 8/18

12:15 pm-11:20 am

3 stops18h 05m

Belfast Intl

Tue 9/2

7:00 am-8:05 pm

3 stops42h 05m

$683

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Tue 11/25

6:05 pm-6:50 pm

2 stops19h 45m

Belfast Intl

Sun 11/30

11:15 pm-2:35 pm

3 stops44h 20m

$691

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Mon 8/18

6:40 pm-11:20 am

2 stops11h 40m

Belfast Intl

Tue 9/2

10:55 pm-6:10 pm

2 stops24h 15m

$695

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Fri 9/12

8:50 pm-8:05 pm

2 stops18h 15m

Belfast Intl

Fri 9/19

6:05 am-11:35 am

2 stops34h 30m

$697

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Wed 11/26

6:55 pm-12:50 pm

1 stop12h 55m

Belfast Intl

Sun 11/30

6:25 pm-8:55 pm

2 stops31h 30m

$708

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 18 resultsSorted by cheapest first
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See travel insights to Belfast from

How to get the cheapest flight ticket from Boston to Belfast Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

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

The month of February is, on average, the cheapest month to fly to Belfast Intl Airport from Boston, with most prices found around $588. If you’re not able to fly to Belfast Intl Airport in February, then September is your next best option. Flight prices from Boston to Belfast Intl Airport during September average around $651.

What is the cheapest day to depart on your flight to Belfast Intl Airport?

The cheapest day to depart on your flight to Belfast Intl Airport is on a Wednesday when prices can be found for as low as $641. This is often the case because there is less demand to fly during this day of the week. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Boston to Belfast Intl Airport for around $968.

What is the cheapest time of day to depart on your flight to Belfast Intl Airport?

In the afternoon is the cheapest time of day to fly from Boston to Belfast Intl Airport when you can find flight prices for as low as $636. Flying to Belfast Intl Airport in the afternoon is an ideal time because this is during off-peak travel hours. In contrast, the most expensive time of day to depart to Belfast Intl Airport is in the evening when prices are around $685.

When to book flights from Boston to Belfast Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Boston to Belfast Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Boston to Belfast Intl Airport (BOS to BFS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Boston to Belfast Intl Airport

Best Price Found

$272

Fastest flight time

11h 35m

Direct flights

None
The best one-way flight to Belfast Intl Airport from Boston in the past 72 hours is $272. The best round-trip flight deal from Boston to Belfast Intl Airport found on momondo in the last 72 hours is $582.
The fastest flight from Boston to Belfast Intl Airport takes 11h 35m
There are no direct flights from Boston to Belfast Intl Airport. Popular non-direct route for this connection is Boston Logan Intl Airport - Belfast Intl Airport.
Search flight deals

  • How far is Boston Logan Intl to Belfast Intl by plane?

    The distance between Boston Logan Intl and Belfast Intl is about 2969.1 mi. By plane, this route typically takes 11h 35m.

  • When did momondo last update prices for flights from Boston Logan Intl Airport to Belfast Intl Airport?

    Prices for flights from Boston Logan Intl Airport to Belfast Intl Airport refresh daily.

  • How many operators does momondo search for flights from Boston Logan Intl Airport to Belfast Intl Airport?

  • How old do you have to be to fly from Boston Logan Intl Airport to Belfast Intl Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Boston Logan Intl Airport to Belfast Intl Airport.

  • What documentation or ID do you need to fly to Belfast Intl Airport?

    The travel and health documents required for your trip to Belfast Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Belfast Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Boston to Belfast Intl Airport?

Best airlines flying from Boston to Belfast Intl Airport

Compare and see reviews for airlines that fly from Boston to Belfast Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $565Free CancellationRating
6.6
7,222 reviews
Search British Airways flights
American AirlinesPriceFrom $586Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

Traveling to a place near Belfast?

Book flights to Belfast if you plan to visit one of these locations
Newry
Armagh
Cookstown
Dungannon

Why use momondo?

Why should I use momondo to find a flight deal from Boston to Belfast?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Belfast from Boston.

Can I find flights from Boston to Belfast with flexible booking policies on momondo?

momondo does allow users to show only those flights to Belfast from Boston which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Boston to Belfast?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Belfast from Boston.

I’m not ready to book a flight from Boston to Belfast right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Belfast from Boston. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Belfast Intl Airport trip

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