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Cheap flights from Boston to Belfast from $320

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 9/17. 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

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Boston to Belfast

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
8:50 pm - 11:10 pmBOS  Boston Logan Intl-BFS Belfast Intl
21h 20m2 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
$736Multiple Airlines
Mon, Sep 7 - Tue, Sep 22
Multiple Airlines Logo
8:50 pm - 3:30 pmBOS  Boston Logan Intl-BFS Belfast Intl
13h 40m2 stops Reykjavik Keflavik Intl London Gatwick
Multiple Airlines Logo
9:05 pm - 2:45 pmBFS  Belfast Intl-BOS Boston Logan Intl
46h 40m3 stops Palma de Mallorca Son Sant Joan Barcelona-El Prat Lisbon Humberto Delgado
$752Multiple Airlines
Mon, Sep 7 - Mon, Sep 14
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
$753Multiple 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
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
7:50 pm - 8:50 pmBOS  Boston Logan Intl-BFS Belfast Intl
20h 00m2 stops Reykjavik Keflavik Intl Edinburgh Turnhouse
Multiple Airlines Logo
5:05 pm - 2:40 pmBFS  Belfast Intl-BOS Boston Logan Intl
26h 35m3 stops London Stansted Barcelona-El Prat Lisbon Humberto Delgado
$777Multiple Airlines
Wed, Nov 4 - Tue, Nov 10
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
Multiple Airlines Logo
7:50 pm - 7:05 pmBOS  Boston Logan Intl-BFS Belfast Intl
18h 15m2 stops Reykjavik Keflavik Intl Paris Charles de Gaulle
Multiple Airlines Logo
7:05 am - 5:50 pmBFS  Belfast Intl-BOS Boston Logan Intl
15h 45m2 stops Paris Charles de Gaulle Reykjavik Keflavik Intl
$789Multiple Airlines
Wed, Nov 4 - Tue, Nov 10
Multiple Airlines Logo
8:50 pm - 11:05 pmBOS  Boston Logan Intl-BFS Belfast Intl
21h 15m2 stops Reykjavik Keflavik Intl Edinburgh Turnhouse
Multiple Airlines Logo
5:55 am - 6:50 pmBFS  Belfast Intl-BOS Boston Logan Intl
17h 55m2 stops Edinburgh Turnhouse Reykjavik Keflavik Intl
$794Multiple Airlines
Mon, Sep 14 - Tue, Sep 29

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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 August 8, 2026.
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

Cheapest round-trip

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Mon 9/7

8:50 pm-11:10 pm

2 stops21h 20m

Belfast Intl

Tue 9/22

5:10 pm-8:20 pm

3 stops32h 10m

$736

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Mon 9/7

8:50 pm-3:30 pm

2 stops13h 40m

Belfast Intl

Mon 9/14

9:05 pm-2:45 pm

3 stops46h 40m

$752

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

$753

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

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 11/4

7:50 pm-8:50 pm

2 stops20h 00m

Belfast Intl

Tue 11/10

5:05 pm-2:40 pm

3 stops26h 35m

$777

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 - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Wed 11/4

7:50 pm-7:05 pm

2 stops18h 15m

Belfast Intl

Tue 11/10

7:05 am-5:50 pm

2 stops15h 45m

$789

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Mon 9/14

8:50 pm-11:05 pm

2 stops21h 15m

Belfast Intl

Tue 9/29

5:55 am-6:50 pm

2 stops17h 55m

$794
Cheapest one-way

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Thu 9/17

11:00 pm-11:55 am

2 stops55h 55m

$320

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 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 July is, on average, the cheapest month to fly to Belfast Intl Airport from Boston, with most prices found around $0. If you’re not able to fly to Belfast Intl Airport in July, then February is your next best option. Flight prices from Boston to Belfast Intl Airport during February average around $0.

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

10h 35m

Direct flights

None
The fastest flight from Boston to Belfast Intl Airport takes 10h 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

Frequently asked questions about flying from Boston to Belfast Intl Airport

  • 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 10h 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 $538Free CancellationRating
6.7
8,153 reviews
Search British Airways flights

Traveling to a place near Belfast?

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

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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