What are the cheapest airlines flying from Boston to Belfast round-trip?

Flying on KLM is currently your cheapest option to Belfast, with prices starting at £415. Additional return tickets that might be worth considering are offered by British Airways and Delta, with the lowest prices starting at £446 and £459, respectively. KLM is priced at 24% lower than the current average price of a flight leaving 3 months from now.

What are the cheapest airlines to fly from Boston to Belfast one-way?

To fly one-way, consider booking your trip with Iberia, which is currently one of the cheapest options available, starting at £235. British Airways flights start at £239 while deals on American Airlines start at £430 one-way.

What is the cheapest month to fly from Boston to Belfast?

February can be a great time to fly to Belfast from Boston with a flight ticket averaging about £552. Cheapflights users have found deals in the month of February for as cheap as £429. The most expensive prices can be found in the month of July.

What is the cheapest time of day to fly from BOS to BFS?

When flying from Boston to Belfast, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What airport do you fly from for flights from Boston to Belfast?

Located just 2.6 mi from the city center, Boston Logan Intl is the airport most travelers will use when flying to Belfast from Boston. Booking flights from Logan Intl (BOS) to Belfast should be relatively easy as there are 0 daily outbound flights to Belfast from 0 different airlines.

Can I find deals for flights from Boston to Belfast that include hotel bookings?

Yes. In addition to deals on Boston to Belfast flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Boston to Belfast?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Belfast.

Can I find deals for business class flights from Boston to Belfast?

Yes. Cheapflights offers flight deals from Boston to Belfast by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£221+ Flights from Boston to Belfast

Cheap flight deals from Boston to Belfast

Round-trip from	£412
One-way from	£221
Popular in	July
Cheapest in	February
Average price	£623

KLM
10/9-18/9
2 total stops
27h 50m total
Boston to Belfast

Search Deals

16/7
3 total stops
30h 20m total
Boston to Belfast

Search Deals

Highest demand for flights based on searches. 13% potential increase in price (£62 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).

Search Deals

Average for round-trip flights in June 2025

Search Deals

Find flight deals from Boston to Belfast

Cheapest flights from Boston to Belfast
Explore the most affordable flight options available from Boston to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 June 2025.

Wed 10/920:15BOS - BHD

1 stop15h 40mMultiple Airlines

Thu 18/906:30BHD - BOS

1 stop12h 10mMultiple Airlines

Deal found 12/6£412

Mon 8/920:50BOS - BHD

2 stops15h 05mKLM

Tue 16/906:30BHD - BOS

1 stop16h 55mKLM

Deal found 12/6£415

Wed 27/819:45BOS - BHD

1 stop11h 10mBritish Airways

Wed 3/916:05BHD - BOS

1 stop11h 40mBritish Airways

Deal found 13/6£446

Wed 10/920:50BOS - BHD

2 stops15h 05mDelta

Thu 18/906:30BHD - BOS

2 stops14h 41mDelta

Deal found 12/6£459

Sun 12/1021:55BOS - BHD

1 stop10h 10mAmerican Airlines

Sun 19/1013:00BHD - BOS

2 stops14h 49mAmerican Airlines

Deal found 12/6£471

Fri 5/907:15BOS - BFS

1 stop11h 15mMultiple Airlines

Sat 6/921:30BFS - BOS

2 stops52h 45mMultiple Airlines

Deal found 10/6£511

Wed 27/821:25BOS - BHD

2 stops15h 15mAer Lingus

Wed 3/906:55BHD - BOS

2 stops12h 45mAer Lingus

Deal found 13/6£598

Best flights from Boston to Belfast
Discover carefully curated flight deals from Boston to Belfast that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 13 June 2025.

Wed 10/920:15BOS - BHD

1 stop15h 40mMultiple Airlines

Thu 18/906:30BHD - BOS

1 stop12h 10mMultiple Airlines

Deal found 12/6£412

Mon 8/920:50BOS - BHD

2 stops15h 05mKLM

Tue 16/906:30BHD - BOS

1 stop16h 55mKLM

Deal found 12/6£415

Wed 27/819:45BOS - BHD

1 stop11h 10mBritish Airways

Wed 3/916:05BHD - BOS

1 stop11h 40mBritish Airways

Deal found 13/6£446

Wed 10/920:50BOS - BHD

2 stops15h 05mDelta

Thu 18/906:30BHD - BOS

2 stops14h 41mDelta

Deal found 12/6£459

Sun 12/1021:55BOS - BHD

1 stop10h 10mAmerican Airlines

Sun 19/1013:00BHD - BOS

2 stops14h 49mAmerican Airlines

Deal found 12/6£471

Wed 27/821:25BOS - BHD

2 stops15h 15mAer Lingus

Wed 3/906:55BHD - BOS

2 stops12h 45mAer Lingus

Deal found 13/6£598

Mon 28/707:25BOS - BFS

2 stops19h 25mMultiple Airlines

Mon 4/817:05BFS - BOS

2 stops32h 05mMultiple Airlines

Deal found 13/6£492

Last-minute flights from Boston to Belfast
Discover last-minute flight deals from Boston to Belfast. Data last updated 13 June 2025 and is based on user searches.

Wed 18/619:15BOS - BFS

2 stops22h 10mMultiple Airlines

Tue 24/606:00BFS - BOS

2 stops16h 50mMultiple Airlines

Deal found 12/6£693

Wed 18/617:36BOS - BHD

2 stops22h 39mDelta

Tue 24/608:30BHD - BOS

2 stops20h 26mDelta

Deal found 12/6£1,460

Sun 22/605:50BOS - BHD

3 stops27h 40mMultiple Airlines

Fri 27/606:45BHD - BOS

3 stops39h 52mMultiple Airlines

Deal found 11/6£957

Sun 22/620:10BOS - BHD

1 stop13h 30mBritish Airways

Fri 27/611:00BHD - BOS

2 stops16h 19mBritish Airways

Deal found 11/6£1,335

Fri 27/618:35BOS - BHD

1 stop17h 20mKLM

Mon 30/617:25BHD - BOS

1 stop25h 10mKLM

Deal found 11/6£537

Fri 27/620:15BOS - BHD

1 stop15h 40mMultiple Airlines

Mon 30/606:30BHD - BOS

2 stops14h 44mMultiple Airlines

Deal found 11/6£596

Fri 27/617:05BOS - BHD

2 stops23h 10mDelta

Mon 30/606:30BHD - BOS

2 stops14h 44mDelta

Deal found 11/6£600

Sat 12/717:30BOS - BHD

2 stops16h 00mAer Lingus

Tue 15/717:55BHD - BOS

2 stops25h 45mAer Lingus

Deal found 12/6£890

Mon 21/716:30BOS - BHD

2 stops16h 10mBritish Airways

Tue 22/718:30BHD - BOS

1 stop30h 40mBritish Airways

Deal found 12/6£454

Mon 21/720:50BOS - BFS

2 stops16h 55mMultiple Airlines

Tue 22/722:55BFS - BOS

2 stops23h 55mMultiple Airlines

Deal found 12/6£548

Sat 26/720:05BOS - BHD

1 stop11h 10mAmerican Airlines

Sun 27/715:50BHD - BOS

1 stop24h 30mAmerican Airlines

Deal found 10/6£486

One-way flights from Boston to Belfast
Search for one-way flight options from Boston to Belfast. Find affordable one-way fares based on user searches. Data last updated 13 June 2025.

Wed 16/720:50BOS - BFS

3 stops30h 20mMultiple Airlines

Deal found 11/6£221

Sat 4/1019:40BOS - BHD

1 stop9h 30mIberia

Deal found 10/6£235

Wed 16/720:50BOS - BHD

3 stops19h 00mMultiple Airlines

Deal found 11/6£236

Sat 4/1016:30BOS - BHD

2 stops12h 40mBritish Airways

Deal found 10/6£239

Mon 30/620:10BOS - BHD

1 stop11h 45mAmerican Airlines

Deal found 13/6£430

Cheapflights Fare Finder

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

BostonBelfast

BOS - BHD

BOSBHD

Boston Logan Intl

Wed 10/9

20:15-16:55

1 stop15h 40m

Belfast City

Thu 18/9

06:30-13:40

1 stop12h 10m

£412

BostonBelfast

BOS - BHD

BOSBHD

Boston Logan Intl

Mon 8/9

20:50-16:55

2 stops15h 05m

Belfast City

Tue 16/9

06:30-18:25

1 stop16h 55m

£415

BostonBelfast

BOS - BHD

BOSBHD

Boston Logan Intl

Wed 27/8

19:45-11:55

1 stop11h 10m

Belfast City

Wed 3/9

16:05-22:45

1 stop11h 40m

£446

BostonBelfast

BOS - BHD

BOSBHD

Boston Logan Intl

Wed 10/9

20:50-16:55

2 stops15h 05m

Belfast City

Thu 18/9

06:30-16:11

2 stops14h 41m

£459

BostonBelfast

BOS - BHD

BOSBHD

Boston Logan Intl

Sun 12/10

21:55-13:05

1 stop10h 10m

Belfast City

Sun 19/10

13:00-22:49

2 stops14h 49m

£471

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Mon 28/7

07:25-07:50

2 stops19h 25m

Belfast Intl

Mon 4/8

17:05-20:10

2 stops32h 05m

£492

BostonBelfast

BOS - BHD

BOSBHD

Boston Logan Intl

Wed 27/8

21:25-17:40

2 stops15h 15m

Belfast City

Wed 3/9

06:55-14:40

2 stops12h 45m

£598

BostonBelfast

BOS - BFS

BOSBFS

Boston Logan Intl

Wed 16/7

20:50-08:10

3 stops30h 20m

£221

BostonBelfast

BOS - BHD

BOSBHD

Boston Logan Intl

Sat 4/10

19:40-10:10

1 stop9h 30m

£235

BostonBelfast

BOS - BHD

BOSBHD

Boston Logan Intl

Wed 16/7

20:50-20:50

3 stops19h 00m

£236

Flights are sorted by cheapest return flights first.

Deals found on 11/6

Showing 1-10 of 12 results

Best time to book a flight from Boston to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast from Boston with our price prediction graph.

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Boston to Belfast

What is the cheapest month to book a flight from Boston to Belfast?

Currently, January is the cheapest month in which you can book a flight from Boston to Belfast (average of £67). Flying from Boston to Belfast in July is currently the most expensive (average of £90). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Rainfall in Belfast by month

In terms of precipitation, rainfall in Belfast ranges from 50.0 - 90.0 inches per month. October is typically the wettest month, when rainfall can reach 90.0 mm. April is typically the driest time to visit Belfast when rainfall is around 50.0 mm.

Temperature in Belfast by month

If weather is an important factor for your trip to Belfast, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 16.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 5.0 C).

Reviews of airlines servicing Belfast

See what other customers who have flown with Delta, KLM and American Airlines from Boston to Belfast have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

7,946 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very Good

7,946 reviews

Delta

8.0

Very Good

7,946 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

KLM

7.8

Good

1,358 reviews

Delta

8.0

Very Good

7,946 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

American Airlines

7.2

Good

10,000 reviews

Delta

8.0

Very Good

7,946 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Aer Lingus

7.1

Good

1,118 reviews

Delta

8.0

Very Good

7,946 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Iberia

7.0

Good

2,776 reviews

Delta

8.0

Very Good

7,946 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

What airport do you fly from for flights from Boston to Belfast?
Located just 2.6 mi from the city center, Boston Logan Intl is the airport most travelers will use when flying to Belfast from Boston. Booking flights from Logan Intl (BOS) to Belfast should be relatively easy as there are 0 daily outbound flights to Belfast from 0 different airlines.
What are the cheapest airlines flying from Boston to Belfast round-trip?
Flying on KLM is currently your cheapest option to Belfast, with prices starting at £415. Additional return tickets that might be worth considering are offered by British Airways and Delta, with the lowest prices starting at £446 and £459, respectively. KLM is priced at 24% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from Boston to Belfast one-way?
To fly one-way, consider booking your trip with Iberia, which is currently one of the cheapest options available, starting at £235. British Airways flights start at £239 while deals on American Airlines start at £430 one-way.
Can I find deals for flights from Boston to Belfast that include hotel bookings?
Yes. In addition to deals on Boston to Belfast flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Boston to Belfast?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boston to Belfast.
Can I find deals for business class flights from Boston to Belfast?
Yes. Cheapflights offers flight deals from Boston to Belfast by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Boston to Belfast?
Currently, January is the cheapest month in which you can book a flight from Boston to Belfast (average of £67). Flying from Boston to Belfast in July is currently the most expensive (average of £90). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Boston to Belfast

Boston to Belfast Intl flights

Boston to Belfast City flights

Hartford to Belfast City flights

Fly with Cheapflights

How does Cheapflights help users find flights from Boston to Belfast?

Cheapflights makes it easy to find Boston to Belfast flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Boston to Belfast?

Cheapflights simply makes it quick and affordable to book flights from Boston to Belfast by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Boston to Belfast with no change fees?

Certainly. Search results for flights to Belfast from Boston shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Boston to Belfast become cheaper?

Not ready to book yet? You can track prices for flights from Boston to Belfast on Cheapflights with our Price Alert feature and get notified when better prices are available.

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Cheapflights is completely free to use, so you can start saving the moment you arrive.

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Our users can plan ahead with confidence and find flights with no change fees

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Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

Cheap flights from Boston to Belfast from £221

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 16/7. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Boston to Belfast

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Boston to Belfast

Cheapest flights from Boston to BelfastExplore the most affordable flight options available from Boston to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 June 2025.

Explore the most affordable flight options available from Boston to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 June 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Boston to Belfast that are best for you.

Best time to book a flight from Boston to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast from Boston with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Boston to Belfast

What is the cheapest month to book a flight from Boston to Belfast?

Rainfall in Belfast by month

Plan your trip to Belfast by taking into account the average rainfall totals by month.

Temperature in Belfast by month

Plan your trip to Belfast by taking into account the average temperature totals by month.

Reviews of airlines servicing Belfast

See what other customers who have flown with Delta, KLM and American Airlines from Boston to Belfast have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Boston to Belfast. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly from for flights from Boston to Belfast?

What are the cheapest airlines flying from Boston to Belfast round-trip?

What are the cheapest airlines to fly from Boston to Belfast one-way?

Can I find deals for flights from Boston to Belfast that include hotel bookings?

How can I find direct flights from Boston to Belfast?

Can I find deals for business class flights from Boston to Belfast?

What is the cheapest month to book a flight from Boston to Belfast?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Boston to Belfast

See prices for flight routes from nearby airports that may be better suited for you.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Boston to Belfast?

Why should you use Cheapflights to find cheap flight tickets from Boston to Belfast?

Can Cheapflights find flights from Boston to Belfast with no change fees?

Can Cheapflights notify me if prices for flights from Boston to Belfast become cheaper?

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Boston to Belfast
Explore the most affordable flight options available from Boston to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 June 2025.