$275 Cheap Flights from Boston (BOS) to Belfast (BFS)

View $275 flight on Sat, Aug 9, 2025Opens in a new window

Popular airlines from Logan International Airport (BOS) to Belfast International Airport (BFS)

Cheap Flights from Boston to Belfast (BOS-BFS)

Prices were available within the past 7 days and start at $275 for one-way flights and $446 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Fri, Apr 17 - Thu, Apr 23
BOS
Boston
BHD
Belfast
$446 Roundtrip, found 2 days ago
$446
Roundtrip
found 2 days ago
Select American Airlines flight, departing Fri, Apr 17 from Boston to Belfast, returning Thu, Apr 23, priced at $446 found 2 days ago
British Airways
Fri, Apr 17 - Thu, Apr 23
BOS
Boston
BHD
Belfast
$446 Roundtrip, found 2 days ago
$446
Roundtrip
found 2 days ago
Select British Airways flight, departing Fri, Apr 17 from Boston to Belfast, returning Thu, Apr 23, priced at $446 found 2 days ago
British Airways
Sun, Apr 26 - Wed, Apr 29
BOS
Boston
BHD
Belfast
$448 Roundtrip, found 1 day ago
$448
Roundtrip
found 1 day ago
Select British Airways flight, departing Sun, Apr 26 from Boston to Belfast, returning Wed, Apr 29, priced at $448 found 1 day ago
American Airlines
Fri, Aug 1 - Thu, Aug 7
BOS
Boston
BHD
Belfast
$450 Roundtrip, found 2 days ago
$450
Roundtrip
found 2 days ago
Select American Airlines flight, departing Fri, Aug 1 from Boston to Belfast, returning Thu, Aug 7, priced at $450 found 2 days ago
American Airlines
Thu, Sep 11 - Sat, Sep 13
BOS
Boston
BHD
Belfast
$453 Roundtrip, found 1 day ago
$453
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Sep 11 from Boston to Belfast, returning Sat, Sep 13, priced at $453 found 1 day ago
American Airlines
Fri, Aug 1 - Thu, Aug 7
BOS
Boston
BHD
Belfast
$460 Roundtrip, found 2 days ago
$460
Roundtrip
found 2 days ago
Select American Airlines flight, departing Fri, Aug 1 from Boston to Belfast, returning Thu, Aug 7, priced at $460 found 2 days ago
British Airways
Fri, Aug 1 - Thu, Aug 7
BOS
Boston
BHD
Belfast
$462 Roundtrip, found 2 days ago
$462
Roundtrip
found 2 days ago
Select British Airways flight, departing Fri, Aug 1 from Boston to Belfast, returning Thu, Aug 7, priced at $462 found 2 days ago
Delta
Wed, Sep 10 - Mon, Sep 22
BOS
Boston
BHD
Belfast
$564 Roundtrip, found 5 hours ago
$564
Roundtrip
found 5 hours ago
Select Delta flight, departing Wed, Sep 10 from Boston to Belfast, returning Mon, Sep 22, priced at $564 found 5 hours ago
Virgin Atlantic
Tue, Oct 7 - Wed, Oct 22
BOS
Boston
BHD
Belfast
$564 Roundtrip, found 4 hours ago
$564
Roundtrip
found 4 hours ago
Select Virgin Atlantic flight, departing Tue, Oct 7 from Boston to Belfast, returning Wed, Oct 22, priced at $564 found 4 hours ago
KLM
Wed, Aug 20 - Wed, Aug 27
BOS
Boston
BHD
Belfast
$616 Roundtrip, found 6 hours ago
$616
Roundtrip
found 6 hours ago
Select KLM flight, departing Wed, Aug 20 from Boston to Belfast, returning Wed, Aug 27, priced at $616 found 6 hours ago

Find the cheapest month to fly from Boston (BOS) to Belfast (BFS)

August is typically the cheapest month to fly

From $547 - $1,200 per traveler.

Graph displaying average flight prices per month

Flights from Boston (BOS) to Belfast (BHD)
Origin airport
Logan Intl.
Destination airport
George Best Belfast City
Roundtrip price
$445
Distance
2983 mi

Boston to Belfast Flights

The cheapest times to fly from Boston to Belfast

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Boston to Belfast are during the month of April. You can find some of the cheapest flights from Boston to Belfast with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Boston to Belfast

Sunday is one of the best days to book for cheap flights from Boston to Belfast: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Boston to Belfast

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Boston to Belfast in 2025. You can also book with separate airlines for your outbound and return journeys, from $275 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Boston to Belfast flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Boston to Belfast airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Logan Intl. Airport (BOS) to Belfast Intl. Airport (BFS) cost?
Discover the latest flight deals from BOS to BFS by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from BOS to BFS?
The cheapest flights from BOS to BFS are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from BOS to BFS?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from BOS to BFS. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Logan Intl. Airport (BOS) to Belfast Intl. Airport (BFS)?
Nonstop flights from Logan Intl. Airport (BOS) to Belfast Intl. Airport (BFS) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your travel dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from BOS to BFS?
Friday is usually the busiest day for flights, while Tuesday tends to be the quietest.* Just remember that flight schedules can vary based on various factors, including the time of year and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Logan Intl. Airport (BOS) to Belfast Intl. Airport (BFS)?
To arrive at Belfast Intl. Airport (BFS) on schedule, book a flight that leaves Logan Intl. Airport (BOS) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Logan Intl. Airport (BOS) to Belfast Intl. Airport (BFS) last-minute?
Last-minute fares from BOS to BFS are generally more expensive. For the best rates, start looking for flights as early as possible. That said, if you're flexible with your travel dates, it's possible to score a cheap fare just before your departure.
Is it cheaper to book a BOS to BFS flight and hotel package?
You'll typically save money by booking a BOS to BFS flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage it all in one place. Once you've chosen your ideal accommodations and flights, consider adding extras such as activities, car rentals and tours.
Can I cancel or change the date of my flight from Logan Intl. Airport (BOS) to Belfast Intl. Airport (BFS)?
If you booked your BOS to BFS flight in the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the fare type you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

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*Available to One Key members.