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Cheap flights from Boston to Belfast from $278

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 5/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Boston to Belfast

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
11:40 pm - 1:05 pm
BOS
-
BFS
33h 25m1 stop
Multiple Airlines Logo
7:00 am - 9:05 pm
BFS
-
BOS
19h 05m2 stops
$567Multiple Airlines
Mon, Mar 23 - Mon, Mar 30
Multiple Airlines Logo
11:40 pm - 1:05 pm
BOS
-
BFS
33h 25m1 stop
Multiple Airlines Logo
9:10 am - 9:05 pm
BFS
-
BOS
16h 55m1 stop
$577Multiple Airlines
Mon, Mar 23 - Mon, Mar 30
Multiple Airlines Logo
7:50 pm - 8:10 pm
BOS
-
BFS
19h 20m2 stops
Multiple Airlines Logo
8:55 pm - 5:50 pm
BFS
-
BOS
25h 55m2 stops
$583Multiple Airlines
Sun, Jan 11 - Mon, Jan 19
Multiple Airlines Logo
7:50 pm - 6:55 pm
BOS
-
BFS
18h 05m2 stops
Multiple Airlines Logo
6:30 am - 5:50 pm
BFS
-
BOS
16h 20m2 stops
$631Multiple Airlines
Sun, Jan 11 - Tue, Jan 27
Multiple Airlines Logo
7:30 am - 9:40 am
BOS
-
BFS
21h 10m1 stop
Multiple Airlines Logo
6:00 am - 7:45 pm
BFS
-
BOS
18h 45m1 stop
$640Multiple Airlines
Sun, Jan 11 - Tue, Jan 27
Multiple Airlines Logo
9:50 pm - 6:30 pm
BOS
-
BFS
15h 40m1 stop
Multiple Airlines Logo
10:00 am - 8:05 pm
BFS
-
BOS
15h 05m1 stop
$645Multiple Airlines
Sat, Apr 4 - Mon, Apr 20
Multiple Airlines Logo
7:50 pm - 9:55 pm
BOS
-
BFS
21h 05m2 stops
Multiple Airlines Logo
5:45 am - 2:35 pm
BFS
-
BOS
37h 50m3 stops
$655Multiple Airlines
Sun, Jan 11 - Tue, Jan 27
Multiple Airlines Logo
7:50 pm - 8:15 pm
BOS
-
BFS
19h 25m2 stops
Multiple Airlines Logo
7:50 am - 2:45 pm
BFS
-
BOS
35h 55m3 stops
$658Multiple Airlines
Mon, Feb 2 - Mon, Feb 9
Multiple Airlines Logo
10:15 am - 4:35 pm
BOS
-
BFS
25h 20m3 stops
Multiple Airlines Logo
7:50 am - 2:45 pm
BFS
-
BOS
35h 55m3 stops
$684Multiple Airlines
Mon, Feb 2 - Mon, Feb 9
Multiple Airlines Logo
7:50 pm - 8:40 pm
BOS
-
BFS
19h 50m3 stops
Multiple Airlines Logo
5:45 am - 2:35 pm
BFS
-
BOS
37h 50m3 stops
$697Multiple Airlines
Sun, Jan 11 - Tue, Jan 27

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 December 21, 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

Mon 3/23

11:40 pm-1:05 pm

1 stop33h 25m

Belfast Intl

Mon 3/30

7:00 am-9:05 pm

2 stops19h 05m

$567

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Mon 3/23

11:40 pm-1:05 pm

1 stop33h 25m

Belfast Intl

Mon 3/30

9:10 am-9:05 pm

1 stop16h 55m

$577

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Sun 1/11

7:50 pm-8:10 pm

2 stops19h 20m

Belfast Intl

Mon 1/19

8:55 pm-5:50 pm

2 stops25h 55m

$583

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Sun 1/11

7:50 pm-6:55 pm

2 stops18h 05m

Belfast Intl

Tue 1/27

6:30 am-5:50 pm

2 stops16h 20m

$631

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Sun 1/11

7:30 am-9:40 am

1 stop21h 10m

Belfast Intl

Tue 1/27

6:00 am-7:45 pm

1 stop18h 45m

$640

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Sat 4/4

9:50 pm-6:30 pm

1 stop15h 40m

Belfast Intl

Mon 4/20

10:00 am-8:05 pm

1 stop15h 05m

$645

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Sun 1/11

7:50 pm-9:55 pm

2 stops21h 05m

Belfast Intl

Tue 1/27

5:45 am-2:35 pm

3 stops37h 50m

$655

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Mon 2/2

7:50 pm-8:15 pm

2 stops19h 25m

Belfast Intl

Mon 2/9

7:50 am-2:45 pm

3 stops35h 55m

$658

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Mon 2/2

10:15 am-4:35 pm

3 stops25h 20m

Belfast Intl

Mon 2/9

7:50 am-2:45 pm

3 stops35h 55m

$684

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Sun 1/11

7:50 pm-8:40 pm

3 stops19h 50m

Belfast Intl

Tue 1/27

5:45 am-2:35 pm

3 stops37h 50m

$697

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first
1
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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 September is, on average, the cheapest month to fly to Belfast Intl Airport from Boston, with most prices found around $614. If you’re not able to fly to Belfast Intl Airport in September, then March is your next best option. Flight prices from Boston to Belfast Intl Airport during March average around $641.

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

Fastest flight time

9h 35m

Direct flights

None
The fastest flight from Boston to Belfast Intl Airport takes 9h 35m
There are no direct flights from Boston to Belfast Intl Airport. There are no popular flight routes from Boston to 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 9h 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 $542Free CancellationRating
6.7
7,600 reviews
Search British Airways flights
American AirlinesPriceFrom $565Free CancellationRating
7.2
11,050 reviews
Search American Airlines flights

Traveling to a place near Belfast?

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