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Cheap flights from Boston to Belfast from £335

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 22/12. 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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Cheap return flights

Multiple Airlines Logo
22:20 - 22:00BOS-BFS
19h 40m2 stops
Multiple Airlines Logo
08:05 - 18:55BFS-BOS
15h 50m2 stops
£452Multiple Airlines
Find Deal
Fri, 31 Oct - Fri, 7 Nov
Multiple Airlines Logo
18:10 - 10:10BOS-BFS
12h 00m2 stops
Multiple Airlines Logo
21:30 - 20:10BFS-BOS
27h 40m3 stops
£505Multiple Airlines
Find Deal
Fri, 31 Oct - Fri, 7 Nov
Multiple Airlines Logo
19:05 - 22:45BOS-BFS
23h 40m3 stops
Multiple Airlines Logo
21:20 - 20:10BFS-BOS
27h 50m3 stops
£531Multiple Airlines
Find Deal
Fri, 31 Oct - Fri, 7 Nov

momondo Fare Finder

 
Customise 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 279,928 searches. Data last updated 17 September 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

Fri 31/10

22:20-22:00

2 stops19h 40m

Belfast Intl

Fri 7/11

08:05-18:55

2 stops15h 50m

£452

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Fri 31/10

18:10-10:10

2 stops12h 00m

Belfast Intl

Fri 7/11

21:30-20:10

3 stops27h 40m

£505

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Fri 31/10

19:05-22:45

3 stops23h 40m

Belfast Intl

Fri 7/11

21:20-20:10

3 stops27h 50m

£531

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Mon 22/12

23:35-14:05

2 stops33h 30m

£335

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Mon 22/12

21:15-10:20

3 stops32h 05m

£378

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

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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 £457. If you’re not able to fly to Belfast Intl Airport in September, then August is your next best option. Flight prices from Boston to Belfast Intl Airport during August average around £473.

What is the cheapest time of day to depart on your flight to Belfast Intl Airport?

The cheapest time of day to fly to Belfast Intl Airport is in the evening when flights can be purchased for as low as £465. In the afternoon is when there is more demand to fly to Belfast Intl Airport, so prices are often more expensive at around £466 per ticket.

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 return 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

Direct flights

None
There are no direct flights from Boston to Belfast Intl Airport. There are no popular flight routes from Boston to Belfast Intl Airport.
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  • How far is Boston Logan Intl to Belfast Intl by plane?

    A flight from Boston Logan Intl to Belfast Intl will travel around 2969.1 mi. A reasonable flight in good conditions will take 12h 00m.

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

    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 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.

Travelling to a place near Belfast?

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

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?

All flight searches from Boston to Belfast on momondo can be filtered to show those which offer flexible booking policies.

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

momondo provides multiple filters to help you find the best flight to Belfast from Boston. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Of course. momondo tracks the price of Boston to Belfast flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Belfast Intl Airport trip

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