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Cheap flights from Boston to Belfast from $361

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
1 adult, Economy, 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
11:00 pm - 10:00 pmBOS  Boston Logan Intl-BFS Belfast Intl
18h 00m2 stops Reykjavik Keflavik Intl London Gatwick
Multiple Airlines Logo
5:10 pm - 8:20 pmBFS  Belfast Intl-BOS Boston Logan Intl
32h 10m3 stops Malaga Barcelona-El Prat Lisbon Humberto Delgado
$743Multiple Airlines
Mon, Sep 14 - Tue, Sep 29
Multiple Airlines Logo
8:50 pm - 8:25 pmBOS  Boston Logan Intl-BFS Belfast Intl
18h 35m2 stops Reykjavik Keflavik Intl London Gatwick
Multiple Airlines Logo
5:10 pm - 9:45 pmBFS  Belfast Intl-BOS Boston Logan Intl
33h 35m3 stops Malaga London Gatwick Reykjavik Keflavik Intl
$762Multiple Airlines
Mon, Sep 14 - Tue, Sep 29
Multiple Airlines Logo
8:50 pm - 8:25 pmBOS  Boston Logan Intl-BFS Belfast Intl
18h 35m2 stops Reykjavik Keflavik Intl London Gatwick
Multiple Airlines Logo
9:15 am - 8:20 pmBFS  Belfast Intl-BOS Boston Logan Intl
40h 05m3 stops London Stansted Barcelona-El Prat Lisbon Humberto Delgado
$763Multiple Airlines
Mon, Sep 14 - Mon, Sep 28
Multiple Airlines Logo
8:50 pm - 8:25 pmBOS  Boston Logan Intl-BFS Belfast Intl
18h 35m2 stops Reykjavik Keflavik Intl London Gatwick
Multiple Airlines Logo
6:40 am - 8:20 pmBFS  Belfast Intl-BOS Boston Logan Intl
42h 40m3 stops London Stansted Barcelona-El Prat Lisbon Humberto Delgado
$764Multiple Airlines
Mon, Sep 14 - Tue, Sep 29
Multiple Airlines Logo
8:50 pm - 8:15 pmBOS  Boston Logan Intl-BFS Belfast Intl
18h 25m2 stops Reykjavik Keflavik Intl London Gatwick
Multiple Airlines Logo
9:30 pm - 2:40 pmBFS  Belfast Intl-BOS Boston Logan Intl
46h 10m3 stops London Luton Madrid Barajas Lisbon Humberto Delgado
$766Multiple Airlines
Wed, Sep 9 - Fri, Sep 18
Multiple Airlines Logo
11:00 pm - 8:30 pmBOS  Boston Logan Intl-BHD Belfast City
16h 30m2 stops Reykjavik Keflavik Intl London Gatwick
Multiple Airlines Logo
2:20 pm - 6:50 pmBHD  Belfast City-BOS Boston Logan Intl
33h 30m2 stops London Gatwick Reykjavik Keflavik Intl
$769Multiple Airlines
Mon, Sep 14 - Tue, Sep 29
Multiple Airlines Logo
11:00 pm - 8:25 pmBOS  Boston Logan Intl-BFS Belfast Intl
16h 25m2 stops Reykjavik Keflavik Intl London Gatwick
Multiple Airlines Logo
9:25 pm - 8:20 pmBFS  Belfast Intl-BOS Boston Logan Intl
27h 55m3 stops Edinburgh Turnhouse Madrid Barajas Lisbon Humberto Delgado
$772Multiple Airlines
Mon, Sep 14 - Mon, Sep 28
Multiple Airlines Logo
7:50 pm - 8:45 pmBOS  Boston Logan Intl-BFS Belfast Intl
19h 55m3 stops Reykjavik Keflavik Intl Oslo Gardermoen London Stansted
Multiple Airlines Logo
7:50 am - 7:55 pmBFS  Belfast Intl-BOS Boston Logan Intl
41h 05m3 stops Manchester Madrid Barajas Lisbon Humberto Delgado
$785Multiple Airlines
Wed, Nov 18 - Sun, Nov 22
Multiple Airlines Logo
11:00 pm - 5:05 pmBOS  Boston Logan Intl-BFS Belfast Intl
13h 05m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
8:50 am - 2:45 pmBFS  Belfast Intl-BOS Boston Logan Intl
34h 55m3 stops London Stansted Barcelona-El Prat Lisbon Humberto Delgado
$789Multiple Airlines
Wed, Sep 23 - Tue, Oct 6
British Airways Logo
9:30 pm - 4:45 pmBOS  Boston Logan Intl-BHD Belfast City
14h 15m1 stop London Heathrow
British Airways Logo
2:40 pm - 9:50 pmBHD  Belfast City-BOS Boston Logan Intl
12h 10m1 stop London Heathrow
$911British Airways
Tue, Nov 24 - Mon, Nov 30

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Delta flights from Boston to Belfast

Our best Delta deals on Boston to Belfast flight tickets
Delta
Aug 14
BOS8:25 pmBoston Logan Intl
15h 30m
1 stop
BHD4:55 pmBelfast City
Aug 21
BHD9:50 amBelfast City
11h 47m
1 stop
BOS4:37 pmBoston Logan Intl
$1,115
Delta
Aug 14
BOS9:05 amBoston Logan Intl
19h 15m
2 stops
BHD9:20 amBelfast City
Aug 21
BHD9:50 amBelfast City
13h 40m
1 stop
BOS6:30 pmBoston Logan Intl
$1,120
Delta
Aug 14
BOS9:05 amBoston Logan Intl
19h 15m
2 stops
BHD9:20 amBelfast City
Aug 21
BHD9:50 amBelfast City
19h 08m
2 stops
BOS11:58 pmBoston Logan Intl
$1,130

British Airways flights from Boston to Belfast

Our best British Airways deals on Boston to Belfast flight tickets
British Airways
Nov 24
BOS9:30 pmBoston Logan Intl
14h 15m
1 stop
BHD4:45 pmBelfast City
Nov 30
BHD2:40 pmBelfast City
12h 10m
1 stop
BOS9:50 pmBoston Logan Intl
$911
British Airways
Nov 25
BOS9:30 pmBoston Logan Intl
11h 45m
1 stop
BHD2:15 pmBelfast City
Dec 1
BHD11:25 amBelfast City
13h 15m
1 stop
BOS7:40 pmBoston Logan Intl
$913
British Airways
Jan 26
BOS9:30 pmBoston Logan Intl
14h 15m
1 stop
BHD4:45 pmBelfast City
Feb 1
BHD11:30 amBelfast City
13h 10m
1 stop
BOS7:40 pmBoston Logan Intl
$919

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 August 5, 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 Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Mon 9/14

11:00 pm-10:00 pm

2 stops18h 00m

Belfast Intl

Tue 9/29

5:10 pm-8:20 pm

3 stops32h 10m

$743

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Mon 9/14

8:50 pm-8:25 pm

2 stops18h 35m

Belfast Intl

Tue 9/29

5:10 pm-9:45 pm

3 stops33h 35m

$762

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Mon 9/14

8:50 pm-8:25 pm

2 stops18h 35m

Belfast Intl

Mon 9/28

9:15 am-8:20 pm

3 stops40h 05m

$763

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Mon 9/14

8:50 pm-8:25 pm

2 stops18h 35m

Belfast Intl

Tue 9/29

6:40 am-8:20 pm

3 stops42h 40m

$764

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Wed 9/9

8:50 pm-8:15 pm

2 stops18h 25m

Belfast Intl

Fri 9/18

9:30 pm-2:40 pm

3 stops46h 10m

$766

BostonBelfast

BOS Boston Logan Intl - BHD Belfast City

BOSBHD

Boston Logan Intl

Mon 9/14

11:00 pm-8:30 pm

2 stops16h 30m

Belfast City

Tue 9/29

2:20 pm-6:50 pm

2 stops33h 30m

$769

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Mon 9/14

11:00 pm-8:25 pm

2 stops16h 25m

Belfast Intl

Mon 9/28

9:25 pm-8:20 pm

3 stops27h 55m

$772

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Wed 11/18

7:50 pm-8:45 pm

3 stops19h 55m

Belfast Intl

Sun 11/22

7:50 am-7:55 pm

3 stops41h 05m

$785

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Wed 9/23

11:00 pm-5:05 pm

2 stops13h 05m

Belfast Intl

Tue 10/6

8:50 am-2:45 pm

3 stops34h 55m

$789
Quickest round-trip

BostonBelfast

BOS Boston Logan Intl - BHD Belfast City

BOSBHD

Boston Logan Intl

Tue 11/24

9:30 pm-4:45 pm

1 stop14h 15m

Belfast City

Mon 11/30

2:40 pm-9:50 pm

1 stop12h 10m

$911

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 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 cheapest month to fly to Belfast?

In general, July 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 July, then you should wait until February to fly from Boston, when ticket prices are also cheap, with an average price of $0.

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 45m

Direct flights

None
The fastest flight from Boston to Belfast takes 10h 45m
There are no direct flights from Boston to Belfast. There are no popular flight routes from Boston to Belfast.
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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 45m, 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 $538Free CancellationRating
6.7
8,148 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.

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Fri 9/4
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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