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Cheap flights from Boston to Belfast from £238

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 17/9. 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

Find the cheapest flights from Boston to Belfast

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
20:50 - 23:10BOS  Boston Logan Intl-BFS Belfast Intl
21h 20m2 stops Reykjavik Keflavik Intl London Gatwick
Multiple Airlines Logo
17:10 - 20:20BFS  Belfast Intl-BOS Boston Logan Intl
32h 10m3 stops Malaga Barcelona-El Prat Lisbon Humberto Delgado
£546Multiple Airlines
Mon, 7 Sep - Tue, 22 Sep
Multiple Airlines Logo
20:50 - 15:30BOS  Boston Logan Intl-BFS Belfast Intl
13h 40m2 stops Reykjavik Keflavik Intl London Gatwick
Multiple Airlines Logo
21:05 - 14:45BFS  Belfast Intl-BOS Boston Logan Intl
46h 40m3 stops Palma de Mallorca Son Sant Joan Barcelona-El Prat Lisbon Humberto Delgado
£558Multiple Airlines
Mon, 7 Sep - Mon, 14 Sep
Multiple Airlines Logo
20:50 - 20:25BOS  Boston Logan Intl-BFS Belfast Intl
18h 35m2 stops Reykjavik Keflavik Intl London Gatwick
Multiple Airlines Logo
17:10 - 21:45BFS  Belfast Intl-BOS Boston Logan Intl
33h 35m3 stops Malaga London Gatwick Reykjavik Keflavik Intl
£559Multiple Airlines
Mon, 14 Sep - Tue, 29 Sep
Multiple Airlines Logo
20:50 - 20:25BOS  Boston Logan Intl-BFS Belfast Intl
18h 35m2 stops Reykjavik Keflavik Intl London Gatwick
Multiple Airlines Logo
17:10 - 21:45BFS  Belfast Intl-BOS Boston Logan Intl
33h 35m3 stops Malaga London Gatwick Reykjavik Keflavik Intl
£566Multiple Airlines
Mon, 14 Sep - Tue, 29 Sep
Multiple Airlines Logo
20:50 - 20:25BOS  Boston Logan Intl-BFS Belfast Intl
18h 35m2 stops Reykjavik Keflavik Intl London Gatwick
Multiple Airlines Logo
06:40 - 20:20BFS  Belfast Intl-BOS Boston Logan Intl
42h 40m3 stops London Stansted Barcelona-El Prat Lisbon Humberto Delgado
£567Multiple Airlines
Mon, 14 Sep - Tue, 29 Sep
Multiple Airlines Logo
19:50 - 20:50BOS  Boston Logan Intl-BFS Belfast Intl
20h 00m2 stops Reykjavik Keflavik Intl Edinburgh Turnhouse
Multiple Airlines Logo
17:05 - 14:40BFS  Belfast Intl-BOS Boston Logan Intl
26h 35m3 stops London Stansted Barcelona-El Prat Lisbon Humberto Delgado
£577Multiple Airlines
Wed, 4 Nov - Tue, 10 Nov
Multiple Airlines Logo
23:00 - 17:05BOS  Boston Logan Intl-BFS Belfast Intl
13h 05m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
08:50 - 14:45BFS  Belfast Intl-BOS Boston Logan Intl
34h 55m3 stops London Stansted Barcelona-El Prat Lisbon Humberto Delgado
£586Multiple Airlines
Wed, 23 Sep - Tue, 6 Oct
Multiple Airlines Logo
20:50 - 23:05BOS  Boston Logan Intl-BFS Belfast Intl
21h 15m2 stops Reykjavik Keflavik Intl Edinburgh Turnhouse
Multiple Airlines Logo
05:55 - 18:50BFS  Belfast Intl-BOS Boston Logan Intl
17h 55m2 stops Edinburgh Turnhouse Reykjavik Keflavik Intl
£589Multiple Airlines
Mon, 14 Sep - Tue, 29 Sep
Multiple Airlines Logo
19:50 - 19:45BOS  Boston Logan Intl-BFS Belfast Intl
18h 55m3 stops Reykjavik Keflavik Intl Dublin Manchester
Multiple Airlines Logo
17:05 - 14:40BFS  Belfast Intl-BOS Boston Logan Intl
26h 35m3 stops London Stansted Barcelona-El Prat Lisbon Humberto Delgado
£595Multiple Airlines
Wed, 4 Nov - Tue, 10 Nov
Multiple Airlines Logo
20:50 - 15:55BOS  Boston Logan Intl-BFS Belfast Intl
14h 05m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
20:55 - 19:55BFS  Belfast Intl-BOS Boston Logan Intl
28h 00m2 stops London Gatwick Zurich
£599Multiple Airlines
Wed, 23 Sep - Tue, 6 Oct

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British Airways flights from Boston to Belfast

Our best British Airways deals on Boston to Belfast flight tickets
British Airways
24 Nov
BOS21:30Boston Logan Intl
14h 15m
1 stop
BHD16:45Belfast City
30 Nov
BHD14:40Belfast City
12h 10m
1 stop
BOS21:50Boston Logan Intl
£676
British Airways
25 Nov
BOS21:30Boston Logan Intl
11h 45m
1 stop
BHD14:15Belfast City
1 Dec
BHD11:25Belfast City
13h 15m
1 stop
BOS19:40Boston Logan Intl
£678
British Airways
26 Jan
BOS21:30Boston Logan Intl
14h 15m
1 stop
BHD16:45Belfast City
1 Feb
BHD11:30Belfast City
13h 10m
1 stop
BOS19:40Boston Logan Intl
£682

KLM flights from Boston to Belfast

Our best KLM deals on Boston to Belfast flight tickets
KLM
7 Sept
BOS16:40Boston Logan Intl
11h 40m
1 stop
BHD09:20Belfast City
14 Sept
BHD17:30Belfast City
34h 40m
2 stops
BOS23:10Boston Logan Intl
£731
KLM
25 Nov
BOS13:35Boston Logan Intl
14h 35m
2 stops
BHD09:10Belfast City
1 Dec
BHD17:20Belfast City
26h 13m
2 stops
BOS14:33Boston Logan Intl
£742
KLM
14 Sept
BOS20:25Boston Logan Intl
15h 30m
1 stop
BHD16:55Belfast City
29 Sept
BHD09:50Belfast City
26h 34m
2 stops
BOS07:24Boston Logan Intl
£760

momondo Fare Finder

 
Customise 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 279,928 searches. Data last updated 8 August 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 return flight

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Mon 7/9

20:50-23:10

2 stops21h 20m

Belfast Intl

Tue 22/9

17:10-20:20

3 stops32h 10m

£546

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Mon 7/9

20:50-15:30

2 stops13h 40m

Belfast Intl

Mon 14/9

21:05-14:45

3 stops46h 40m

£558

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Mon 14/9

20:50-20:25

2 stops18h 35m

Belfast Intl

Tue 29/9

17:10-21:45

3 stops33h 35m

£559

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Mon 14/9

20:50-20:25

2 stops18h 35m

Belfast Intl

Tue 29/9

17:10-21:45

3 stops33h 35m

£566

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Mon 14/9

20:50-20:25

2 stops18h 35m

Belfast Intl

Tue 29/9

06:40-20:20

3 stops42h 40m

£567

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Wed 4/11

19:50-20:50

2 stops20h 00m

Belfast Intl

Tue 10/11

17:05-14:40

3 stops26h 35m

£577

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Wed 23/9

23:00-17:05

2 stops13h 05m

Belfast Intl

Tue 6/10

08:50-14:45

3 stops34h 55m

£586
Fastest return journey

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Mon 14/9

20:50-23:05

2 stops21h 15m

Belfast Intl

Tue 29/9

05:55-18:50

2 stops17h 55m

£589

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Wed 4/11

19:50-19:45

3 stops18h 55m

Belfast Intl

Tue 10/11

17:05-14:40

3 stops26h 35m

£595

BostonBelfast

BOS Boston Logan Intl - BFS Belfast Intl

BOSBFS

Boston Logan Intl

Wed 23/9

20:50-15:55

2 stops14h 05m

Belfast Intl

Tue 6/10

20:55-19:55

2 stops28h 00m

£599

Flights are sorted by cheapest return 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 cheapest month to fly to Belfast?

The cheapest month to fly to Belfast from Boston is in July. Flight prices, which tend to average around £0, are often lower during this time because this is during the off-season. If you aren’t able to travel to Belfast during the month of July, then flying in February is also cheap. Prices for this month can be found on momondo for an average 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 35m

Direct flights

None
The fastest flight from Boston to Belfast takes 10h 35m
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?

    Belfast is 2981.1 mi away from Boston Logan Intl. Typically, this will take 10h 35m by plane in normal conditions.

  • 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 are refreshed on a daily basis.

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for 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.

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Boston to Belfast for you.

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

Yes. momondo allows you to filter the results for Boston to Belfast flights to just show those with flexible booking policies.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Boston to Belfast.

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

If you are simply researching potential flights to Belfast, momondo offers a useful price alert feature which will track prices for flights to Belfast from Boston and alert you when they change.

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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