$339 Cheap Flights from Boston (BOS) to Belfast (BFS)

View $339 flight on Sat, Aug 23, 2025Opens in a new window

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Find available prices by choosing your travel dates.

Cheap Flights from Boston to Belfast (BOS-BFS)

Prices were available within the past 7 days and start at $339 for one-way flights and $657 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Apr 29 - Thu, May 1
BOS
Boston
BHD
Belfast
$657 Roundtrip, found 3 days ago
$657
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Apr 29 from Boston to Belfast, returning Thu, May 1, priced at $657 found 3 days ago
American Airlines
Thu, Sep 4 - Wed, Sep 10
BOS
Boston
BHD
Belfast
$665 Roundtrip, found 6 days ago
$665
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, Sep 4 from Boston to Belfast, returning Wed, Sep 10, priced at $665 found 6 days ago
American Airlines
Mon, Aug 4 - Mon, Oct 6
BOS
Boston
BHD
Belfast
$665 Roundtrip, found 1 day ago
$665
Roundtrip
found 1 day ago
Select American Airlines flight, departing Mon, Aug 4 from Boston to Belfast, returning Mon, Oct 6, priced at $665 found 1 day ago
British Airways
Mon, Aug 4 - Mon, Oct 6
BOS
Boston
BHD
Belfast
$667 Roundtrip, found 1 day ago
$667
Roundtrip
found 1 day ago
Select British Airways flight, departing Mon, Aug 4 from Boston to Belfast, returning Mon, Oct 6, priced at $667 found 1 day ago
American Airlines
Thu, Sep 4 - Wed, Sep 10
BOS
Boston
BHD
Belfast
$669 Roundtrip, found 6 days ago
$669
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, Sep 4 from Boston to Belfast, returning Wed, Sep 10, priced at $669 found 6 days ago
American Airlines
Sat, Aug 23 - Sat, Aug 30
BOS
Boston
BHD
Belfast
$672 Roundtrip, just found
$672
Roundtrip
just found
Select American Airlines flight, departing Sat, Aug 23 from Boston to Belfast, returning Sat, Aug 30, priced at $672 just found
British Airways
Sat, Apr 26 - Fri, May 9
BOS
Boston
BHD
Belfast
$674 Roundtrip, found 2 hours ago
$674
Roundtrip
found 2 hours ago
Select British Airways flight, departing Sat, Apr 26 from Boston to Belfast, returning Fri, May 9, priced at $674 found 2 hours ago
American Airlines
Thu, Sep 4 - Wed, Sep 10
BOS
Boston
BHD
Belfast
$674 Roundtrip, found 6 days ago
$674
Roundtrip
found 6 days ago
Select American Airlines flight, departing Thu, Sep 4 from Boston to Belfast, returning Wed, Sep 10, priced at $674 found 6 days ago
Iberia
Mon, Aug 4 - Mon, Oct 6
BOS
Boston
BHD
Belfast
$675 Roundtrip, found 1 day ago
$675
Roundtrip
found 1 day ago
Select Iberia flight, departing Mon, Aug 4 from Boston to Belfast, returning Mon, Oct 6, priced at $675 found 1 day ago
KLM
Tue, May 6 - Thu, May 8
BOS
Boston
BHD
Belfast
$683 Roundtrip, found 4 days ago
$683
Roundtrip
found 4 days ago
Select KLM flight, departing Tue, May 6 from Boston to Belfast, returning Thu, May 8, priced at $683 found 4 days ago

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.
*Available to One Key members.