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Cheap flights from Boston to Belfast from $319

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 9/1. 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
11:35 pm - 11:30 pm
BOS
-
BFS
18h 55m
2 stops
Multiple Airlines Logo
5:45 pm - 9:45 pm
BFS
-
BOS
33h 00m
1 stop
$822Multiple Airlines
Thu, Jul 16 - Wed, Jul 29
Multiple Airlines Logo
8:50 pm - 7:50 pm
BOS
-
BFS
18h 00m
3 stops
Multiple Airlines Logo
2:50 pm - 8:20 pm
BFS
-
BOS
34h 30m
3 stops
$868Multiple Airlines
Tue, Aug 25 - Thu, Sep 10
British Airways Logo
9:50 pm - 3:20 pm
BOS
-
BHD
12h 30m
1 stop
British Airways Logo
9:35 am - 8:05 pm
BHD
-
BOS
15h 30m
1 stop
$892British Airways
Tue, Aug 25 - Thu, Sep 10
Multiple Airlines Logo
11:00 pm - 10:15 pm
BOS
-
BFS
18h 15m
2 stops
Multiple Airlines Logo
2:50 pm - 8:20 pm
BFS
-
BOS
34h 30m
3 stops
$894Multiple Airlines
Tue, Aug 25 - Thu, Sep 10
British Airways Logo
9:50 pm - 3:30 pm
BOS
-
BHD
12h 40m
1 stop
British Airways Logo
12:45 pm - 8:05 pm
BHD
-
BOS
12h 20m
1 stop
$911British Airways
Mon, Oct 19 - Thu, Oct 22
British Airways Logo
7:35 pm - 12:55 pm
BOS
-
BHD
12h 20m
1 stop
British Airways Logo
2:20 pm - 8:05 pm
BHD
-
BOS
10h 45m
1 stop
$912British Airways
Mon, Oct 19 - Thu, Oct 22
British Airways Logo
6:26 pm - 3:20 pm
BOS
-
BHD
15h 54m
2 stops
British Airways Logo
9:35 am - 5:05 pm
BHD
-
BOS
12h 30m
1 stop
$915British Airways
Tue, Aug 25 - Thu, Sep 10
British Airways Logo
6:26 pm - 3:20 pm
BOS
-
BHD
15h 54m
2 stops
British Airways Logo
9:35 am - 6:49 pm
BHD
-
BOS
14h 14m
2 stops
$925British Airways
Tue, Aug 25 - Thu, Sep 10
Aer Lingus Logo
5:25 pm - 8:50 pm
BOS
-
BHD
22h 25m
2 stops
Aer Lingus Logo
7:00 am - 6:50 pm
BHD
-
BOS
16h 50m
2 stops
$1,004Aer Lingus
Mon, Jun 1 - Thu, Jun 4
Delta Logo
8:25 pm - 4:55 pm
BOS
-
BHD
15h 30m
1 stop
Delta Logo
9:50 am - 4:40 pm
BHD
-
BOS
11h 50m
1 stop
$1,066Delta
Sat, Jul 18 - Wed, Jul 29

Aer Lingus flights from Boston to Belfast

Our best Aer Lingus deals on Boston to Belfast flight tickets
Aer Lingus
Jun 1
BOS5:25 pmBoston Logan Intl
22h 25m
2 stops
BHD8:50 pmBelfast City
Jun 4
BHD7:00 amBelfast City
16h 50m
2 stops
BOS6:50 pmBoston Logan Intl
$1,004
Aer Lingus
May 19
BOS5:25 pmBoston Logan Intl
19h 25m
2 stops
BHD5:50 pmBelfast City
May 22
BHD12:50 pmBelfast City
35h 00m
2 stops
BOS6:50 pmBoston Logan Intl
$1,138
Aer Lingus
Jul 18
BOS5:25 pmBoston Logan Intl
13h 30m
2 stops
BHD11:55 amBelfast City
Jul 31
BHD7:00 amBelfast City
12h 55m
2 stops
BOS2:55 pmBoston Logan Intl
$1,221

British Airways flights from Boston to Belfast

Our best British Airways deals on Boston to Belfast flight tickets
British Airways
Aug 25
BOS9:50 pmBoston Logan Intl
12h 30m
1 stop
BHD3:20 pmBelfast City
Sep 10
BHD9:35 amBelfast City
15h 30m
1 stop
BOS8:05 pmBoston Logan Intl
$892
British Airways
Oct 19
BOS9:50 pmBoston Logan Intl
12h 40m
1 stop
BHD3:30 pmBelfast City
Oct 22
BHD12:45 pmBelfast City
12h 20m
1 stop
BOS8:05 pmBoston Logan Intl
$911
British Airways
Oct 19
BOS7:35 pmBoston Logan Intl
12h 20m
1 stop
BHD12:55 pmBelfast City
Oct 22
BHD2:20 pmBelfast City
10h 45m
1 stop
BOS8:05 pmBoston Logan Intl
$912

momondo Fare Finder

 
Customize your flight search to find flights from Boston to Belfast 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 May 6, 2026.
Use the filters below to find and compare flights from Boston to Belfast that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Thu 7/16

11:35 pm-11:30 pm

2 stops18h 55m

Belfast Intl

Wed 7/29

5:45 pm-9:45 pm

1 stop33h 00m

$822

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Tue 8/25

8:50 pm-7:50 pm

3 stops18h 00m

Belfast Intl

Thu 9/10

2:50 pm-8:20 pm

3 stops34h 30m

$868

BostonBelfast

BOS - BHD

BOSBHD

Boston Logan Intl

Tue 8/25

9:50 pm-3:20 pm

1 stop12h 30m

Belfast City

Thu 9/10

9:35 am-8:05 pm

1 stop15h 30m

$892

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Tue 8/25

11:00 pm-10:15 pm

2 stops18h 15m

Belfast Intl

Thu 9/10

2:50 pm-8:20 pm

3 stops34h 30m

$894

BostonBelfast

BOS - BHD

BOSBHD

Boston Logan Intl

Mon 10/19

9:50 pm-3:30 pm

1 stop12h 40m

Belfast City

Thu 10/22

12:45 pm-8:05 pm

1 stop12h 20m

$911
Quickest round-trip

BostonBelfast

BOS - BHD

BOSBHD

Boston Logan Intl

Mon 10/19

7:35 pm-12:55 pm

1 stop12h 20m

Belfast City

Thu 10/22

2:20 pm-8:05 pm

1 stop10h 45m

$912

BostonBelfast

BOS - BHD

BOSBHD

Boston Logan Intl

Tue 8/25

6:26 pm-3:20 pm

2 stops15h 54m

Belfast City

Thu 9/10

9:35 am-5:05 pm

1 stop12h 30m

$915

BostonBelfast

BOS - BHD

BOSBHD

Boston Logan Intl

Tue 8/25

6:26 pm-3:20 pm

2 stops15h 54m

Belfast City

Thu 9/10

9:35 am-6:49 pm

2 stops14h 14m

$925

BostonBelfast

BOS - BHD

BOSBHD

Boston Logan Intl

Mon 6/1

5:25 pm-8:50 pm

2 stops22h 25m

Belfast City

Thu 6/4

7:00 am-6:50 pm

2 stops16h 50m

$1,004

BostonBelfast

BOS - BHD

BOSBHD

Boston Logan Intl

Sat 7/18

8:25 pm-4:55 pm

1 stop15h 30m

Belfast City

Wed 7/29

9:50 am-4:40 pm

1 stop11h 50m

$1,066

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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

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 typical price of a round-trip flight between Boston and Belfast?

What is the cheapest month to fly to Belfast?

In general, February is the cheapest month to fly from Boston to Belfast. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $0. If you don’t want to visit Belfast in February, then you should wait until March to fly from Boston, when ticket prices are also cheap, with an average price of $513.

Cheap Boston to Belfast flight deals and tips

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

Fastest flight time

10h 05m

Direct flights

None
The fastest flight from Boston to Belfast takes 10h 05m
There are no direct flights from Boston to Belfast. There are no popular flight routes from Boston to Belfast.
Search flight deals

Frequently asked questions about flying from Boston to Belfast

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

    A flight from Boston Logan Intl to Belfast will travel around 2981.1 mi. Flights usually cover this in 10h 05m, depending on flying conditions and air traffic around both airports.

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

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

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

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

    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.

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

    The travel and health documents required for your trip to Belfast 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. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Boston to Belfast

Compare and see reviews for airlines that fly from Boston to Belfast with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $534Free CancellationRating
6.7
7,944 reviews
Search British Airways flights

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Boston to Belfast. momondo saves you time and could save you money on your trip.

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

Yes. momondo enables you to select and highlight flights to Belfast from Boston with this policy.

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

Once all potential Boston to Belfast flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Price alerts on flights to Belfast from Boston are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Belfast trip

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Find better results for your trip to the United Kingdom

Fly into one of these airports located in Belfast

Airports listed have a maximum distance of 12.2 mi from Belfast
Belfast Intl Airport
Belfast City Airport