One Way
Fare Type:
  • Regular
  • Student
    Student Fare

    Only students above 12 years of age are eligible for special fares and/or additional baggage allowances. Carrying valid student ID cards and student visas (where applicable) is mandatory, else the passenger may be denied boarding or asked to pay for extra baggage.

Popular Filters

One Way Price

₹ 50,403 ₹ 1,60,000

Duration

10 h 0 m 31 h 0 m

Stops From Boston

Departure From Boston

Before 6 am

₹ 50,403

6 am - 12 pm

₹ 59,094

12 pm - 6 pm

₹ 59,094

After 6 pm

₹ 59,094

Arrival at Sofia

6 am - 12 pm

₹ 65,874

12 pm - 6 pm

₹ 59,094

After 6 pm

₹ 50,403

Alliances & Airlines

Oneworld

()

SkyTeam

(5)

Star Alliance

(16)

+ 1 more

Layover Airports

+ 4 more

Layover Duration

50 m 19 h 0 m
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Limited Period Offers

Premium Hotels Nearby Sofia

Boston to Sofia Flights, Fares @ ₹50403 + Flat Rs 1500 OFF

Use promo code GOINTL and Instant Discount of Rs 10,000 on your Boston to Sofia round trip flight booking. Lowest Airfare from Boston to Sofia is ₹50403 on 19 May. For fastest booking and best discounts on flight tickets visit Goibibo. Also check cheapest return Sofia to Boston flight tickets online here.
Sorted By:
Departure
Duration
Arrival
Price
Air Canada

₹ 50,403

Get Flat Rs 1275 OFF using code GODEALS | Get Flat 10% OFF using Axis Credit cards using GOAXISINTFEST

Boston to Sofia , 19 May

Air Canada AC 767

05:10

Tue, 19 May 26

Terminal B

Boston, United States

01 h 53 m

07:03

Tue, 19 May 26

Terminal T1

Toronto, Canada

BAGGAGE : CHECK INCABIN

Information not available

Air Canada AC 9614 | Operated By Lufthansa

20:20

Tue, 19 May 26

Terminal T1

Toronto, Canada

07 h 50 m

10:10

Wed, 20 May 26

Terminal T2

Munich, Germany

BAGGAGE : CHECK INCABIN

Information not available

Air Canada AC 9375 | Operated By Lufthansa

15:45

Wed, 20 May 26

Terminal T2

Munich, Germany

01 h 55 m

18:40

Wed, 20 May 26

Terminal T2

Sofia, Bulgaria

BAGGAGE : CHECK INCABIN

Information not available

FARES
Cabin bagCheck-inCancellationDate ChangeMeal

Basic

Fare offered by airline.

1 Piece
0 Kg
Free cancellation allowed upto 2 days before departure
Date Change Fee starting
₹ 28,625
Get complimentary meals

₹ 50,403

Standard

Fare offered by airline.

1 Piece
1 Piece
Free cancellation allowed upto 2 days before departure
Free date change allowed
Get complimentary meals

₹ 69,453

Flex

Fare offered by airline.

1 Piece
1 Piece
Free cancellation allowed upto 2 days before departure
Free date change allowed
Get complimentary meals

₹ 87,163

Premium economy standard

Fare offered by airline.

1 Piece
2 Pieces
Free cancellation allowed upto 2 days before departure
Free date change allowed
Get complimentary meals

₹ 1,18,758

United Airlines

More Timing Options

₹ 59,094

Get Flat Rs 1275 OFF using code GODEALS | Get Flat 10% OFF using Axis Credit cards using GOAXISINTFEST

Boston to Sofia , 19 May

United Airlines UA 721

14:22

Tue, 19 May 26

Terminal B

Boston, United States

01 h 46 m

16:08

Tue, 19 May 26

Washington-Dulles Apt, United States

BAGGAGE : CHECK INCABIN

Information not available

United Airlines UA 108

17:25

Tue, 19 May 26

Washington-Dulles Apt, United States

08 h 20 m

07:45

Wed, 20 May 26

Terminal T2

Munich, Germany

BAGGAGE : CHECK INCABIN

Information not available

United Airlines UA 9246 | Operated By Lufthansa

09:15

Wed, 20 May 26

Terminal T2

Munich, Germany

01 h 55 m

12:10

Wed, 20 May 26

Terminal T2

Sofia, Bulgaria

BAGGAGE : CHECK INCABIN

Information not available

FARES
Cabin bagCheck-inCancellationDate ChangeSeat

Basic economy

Fare offered by airline.

1 Piece
0 Kg
Non-refundable fare
Date Change Fee starting
₹ 28,625
Chargeable

₹ 59,094

Economy

Fare offered by airline.

1 Piece
1 Piece
Non-refundable fare
Free date change allowed
Free seats available

₹ 68,664

Economy fully refundable

Fare offered by airline.

1 Piece
1 Piece
Free cancellation allowed upto 2 days before departure
Free date change allowed
Free seats available

₹ 1,10,309

Economy plus fully refundable|premium economy fully ref

Fare offered by airline.

1 Piece
2 Pieces
Free cancellation allowed upto 2 days before departure
Free date change allowed
Free seats available

₹ 6,70,164

Air Canada

₹ 59,415

Get Flat Rs 1275 OFF using code GODEALS | Get Flat 10% OFF using Axis Credit cards using GOAXISINTFEST

Boston to Sofia , 19 May

Air Canada AC 751

10:35

Tue, 19 May 26

Terminal B

Boston, United States

01 h 18 m

11:53

Tue, 19 May 26

Montreal, Canada

BAGGAGE : CHECK INCABIN

Information not available

Air Canada AC 9098 | Operated By Lufthansa

20:40

Tue, 19 May 26

Montreal, Canada

07 h 15 m

09:55

Wed, 20 May 26

Terminal T2

Munich, Germany

BAGGAGE : CHECK INCABIN

Information not available

Air Canada AC 9375 | Operated By Lufthansa

15:45

Wed, 20 May 26

Terminal T2

Munich, Germany

01 h 55 m

18:40

Wed, 20 May 26

Terminal T2

Sofia, Bulgaria

BAGGAGE : CHECK INCABIN

Information not available

FARES
Cabin bagCheck-inCancellationDate ChangeMeal

Basic

Fare offered by airline.

1 Piece
0 Kg
Free cancellation allowed upto 2 days before departure
Date Change Fee starting
₹ 28,625
Get complimentary meals

₹ 59,415

Standard

Fare offered by airline.

1 Piece
1 Piece
Free cancellation allowed upto 2 days before departure
Free date change allowed
Get complimentary meals

₹ 68,985

Flex

Fare offered by airline.

1 Piece
1 Piece
Free cancellation allowed upto 2 days before departure
Free date change allowed
Get complimentary meals

₹ 86,695

Premium economy standard

Fare offered by airline.

1 Piece
2 Pieces
Free cancellation allowed upto 2 days before departure
Free date change allowed
Get complimentary meals

₹ 1,51,220

United Airlines

₹ 65,874

Get Flat Rs 1275 OFF using code GODEALS | Get Flat 10% OFF using Axis Credit cards using GOAXISINTFEST

Boston to Sofia , 19 May

United Airlines UA 9855 | Operated By Austrian Airlines

17:10

Tue, 19 May 26

Terminal E

Boston, United States

08 h

07:10

Wed, 20 May 26

Terminal T3

Vienna, Austria

BAGGAGE : CHECK INCABIN

Information not available

United Airlines UA 9832 | Operated By Austrian Airlines

09:10

Wed, 20 May 26

Terminal T3

Vienna, Austria

01 h 30 m

11:40

Wed, 20 May 26

Terminal T2

Sofia, Bulgaria

BAGGAGE : CHECK INCABIN

Information not available

FARES
Cabin bagCheck-inCancellationDate ChangeSeat

Basic economy

Fare offered by airline.

1 Piece
0 Kg
Non-refundable fare
Date Change Fee starting
₹ 28,625
Chargeable

₹ 65,874

Economy

Fare offered by airline.

1 Piece
1 Piece
Non-refundable fare
Free date change allowed
Free seats available

₹ 75,449

Economy fully refundable

Fare offered by airline.

1 Piece
1 Piece
Free cancellation allowed upto 2 days before departure
Free date change allowed
Free seats available

₹ 1,10,679

Swiss

₹ 67,300

Get Flat Rs 1350 OFF using code GODEALS | Get Flat 10% OFF using Axis Credit cards using GOAXISINTFEST

Boston to Sofia , 19 May

Swiss LX 55

17:20

Tue, 19 May 26

Terminal E

Boston, United States

06 h 55 m

06:15

Wed, 20 May 26

Zurich, Switzerland

BAGGAGE : CHECK INCABIN

Information not available

Swiss LX 1390 | Operated By Helvetic Airways

07:05

Wed, 20 May 26

Zurich, Switzerland

02 h 15 m

10:20

Wed, 20 May 26

Terminal T2

Sofia, Bulgaria

BAGGAGE : CHECK INCABIN

Information not available

FARES
Cabin bagCheck-inCancellationDate ChangeSeatMeal

Eco light

Fare offered by airline.

1 Piece
0 Kg
Free cancellation allowed upto 2 days before departure
Date Change Fee starting
₹ 28,625
Chargeable
Get complimentary meals

₹ 67,300

Eco standard

Fare offered by airline.

1 Piece
1 Piece
Free cancellation allowed upto 2 days before departure
Free date change allowed
Chargeable
Get complimentary meals

₹ 76,875

Eco flex

Fare offered by airline.

1 Piece
1 Piece
Free cancellation allowed upto 2 days before departure
Free date change allowed
Chargeable
Get complimentary meals

₹ 99,180

Prem eco standard

Fare offered by airline.

1 Piece
2 Pieces
Free cancellation allowed upto 2 days before departure
Free date change allowed
----
Get complimentary meals

₹ 1,52,695

United Airlines

₹ 67,462

Get Flat Rs 1275 OFF using code GODEALS | Get Flat 10% OFF using Axis Credit cards using GOAXISINTFEST

Boston to Sofia , 19 May

United Airlines UA 9805 | Operated By Swiss

17:20

Tue, 19 May 26

Terminal E

Boston, United States

06 h 55 m

06:15

Wed, 20 May 26

Zurich, Switzerland

BAGGAGE : CHECK INCABIN

Information not available

United Airlines UA 9734 | Operated By Air Baltic

07:15

Wed, 20 May 26

Zurich, Switzerland

01 h

08:15

Wed, 20 May 26

Terminal T2

Munich, Germany

BAGGAGE : CHECK INCABIN

Information not available

United Airlines UA 9246 | Operated By Lufthansa

09:15

Wed, 20 May 26

Terminal T2

Munich, Germany

01 h 55 m

12:10

Wed, 20 May 26

Terminal T2

Sofia, Bulgaria

BAGGAGE : CHECK INCABIN

Information not available

FARES
Cabin bagCheck-inCancellationDate ChangeSeat

Basic economy

Fare offered by airline.

1 Piece
0 Kg
Non-refundable fare
Date Change Fee starting
₹ 28,625
Chargeable

₹ 67,462

Economy

Fare offered by airline.

1 Piece
1 Piece
Non-refundable fare
Free date change allowed
Free seats available

₹ 77,037

Economy fully refundable

Fare offered by airline.

1 Piece
1 Piece
Free cancellation allowed upto 2 days before departure
Free date change allowed
Free seats available

₹ 1,12,267

Swiss

₹ 69,569

Get Flat Rs 1350 OFF using code GODEALS | Get Flat 10% OFF using Axis Credit cards using GOAXISINTFEST

Boston to Sofia , 19 May

Swiss LX 55

17:20

Tue, 19 May 26

Terminal E

Boston, United States

06 h 55 m

06:15

Wed, 20 May 26

Zurich, Switzerland

BAGGAGE : CHECK INCABIN

Information not available

Swiss LX 1100 | Operated By Air Baltic

07:15

Wed, 20 May 26

Zurich, Switzerland

01 h

08:15

Wed, 20 May 26

Terminal T2

Munich, Germany

BAGGAGE : CHECK INCABIN

Information not available

Swiss LX 3816 | Operated By Lufthansa

09:15

Wed, 20 May 26

Terminal T2

Munich, Germany

01 h 55 m

12:10

Wed, 20 May 26

Terminal T2

Sofia, Bulgaria

BAGGAGE : CHECK INCABIN

Information not available

FARES
Cabin bagCheck-inCancellationDate ChangeSeatMeal

Eco light

Fare offered by airline.

1 Piece
0 Kg
Free cancellation allowed upto 2 days before departure
Date Change Fee starting
₹ 28,625
Chargeable
Get complimentary meals

₹ 69,569

Eco standard

Fare offered by airline.

1 Piece
1 Piece
Free cancellation allowed upto 2 days before departure
Free date change allowed
Chargeable
Get complimentary meals

₹ 79,144

Eco flex

Fare offered by airline.

1 Piece
1 Piece
Free cancellation allowed upto 2 days before departure
Free date change allowed
Chargeable
Get complimentary meals

₹ 1,01,449

Prem eco standard

Fare offered by airline.

1 Piece
2 Pieces
Free cancellation allowed upto 2 days before departure
Free date change allowed
----
Get complimentary meals

₹ 1,54,964

Delta Air Lines, Bulgaria Air

₹ 70,118

Get Flat Rs 1275 OFF using code GODEALS | Get Flat 10% OFF using Axis Credit cards using GOAXISINTFEST

Boston to Sofia , 19 May

Delta Air Lines DL 224

19:00

Tue, 19 May 26

Terminal E

Boston, United States

07 h 10 m

08:10

Wed, 20 May 26

Terminal T2E

Paris, France

BAGGAGE : CHECK INCABIN

Information not available

Bulgaria Air FB 432

10:15

Wed, 20 May 26

Terminal T1

Paris, France

02 h 45 m

14:00

Wed, 20 May 26

Terminal T2

Sofia, Bulgaria

BAGGAGE : CHECK INCABIN

Information not available

FARES
Cabin bagCheck-inCancellationDate ChangeSeatMeal

Delta main classic

Fare offered by airlines.

1 Piece
1 Piece
Free cancellation allowed upto 2 days before departure
Free date change allowed
Free seats available
Get complimentary meals

₹ 70,118

Delta main extra

Fare offered by airlines.

1 Piece
1 Piece
Free cancellation allowed upto 2 days before departure
Free date change allowed
Free seats available
Get complimentary meals

₹ 79,693

Delta premium select classic

Fare offered by airlines.

1 Piece
2 Pieces
Free cancellation allowed upto 2 days before departure
Free date change allowed
Free seats available
Get complimentary meals

₹ 1,42,113

Delta Air Lines, Bulgaria Air

₹ 77,651

Get Flat Rs 1275 OFF using code GODEALS | Get Flat 10% OFF using Axis Credit cards using GOAXISINTFEST

Boston to Sofia , 19 May

Delta Air Lines DL 242

18:50

Tue, 19 May 26

Terminal E

Boston, United States

07 h 10 m

08:00

Wed, 20 May 26

Amsterdam, Netherlands

BAGGAGE : CHECK INCABIN

Information not available

Bulgaria Air FB 462

10:15

Wed, 20 May 26

Amsterdam, Netherlands

02 h 45 m

14:00

Wed, 20 May 26

Terminal T2

Sofia, Bulgaria

BAGGAGE : CHECK INCABIN

Information not available

FARES
Cabin bagCheck-inCancellationDate ChangeSeatMeal

Delta main classic

Fare offered by airlines.

1 Piece
1 Piece
Free cancellation allowed upto 2 days before departure
Free date change allowed
Free seats available
Get complimentary meals

₹ 77,651

Delta main extra

Fare offered by airlines.

1 Piece
1 Piece
Free cancellation allowed upto 2 days before departure
Free date change allowed
Free seats available
Get complimentary meals

₹ 87,226

Delta premium select classic

Fare offered by airlines.

1 Piece
2 Pieces
Free cancellation allowed upto 2 days before departure
Free date change allowed
Free seats available
Get complimentary meals

₹ 2,27,571

KLM Royal Dutch, Bulgaria Air

₹ 1,12,870

Get Flat Rs 1350 OFF using code GODEALS | Get Flat 10% OFF using Axis Credit cards using GOAXISINTFEST

Boston to Sofia , 19 May

KLM Royal Dutch KL 6117 | Operated By Delta Air Lines

15:20

Tue, 19 May 26

Terminal E

Boston, United States

09 h 15 m

07:35

Wed, 20 May 26

Athens, Greece

BAGGAGE : CHECK INCABIN

Information not available

Bulgaria Air FB 1506 | Operated By Aegean Airlines

08:50

Wed, 20 May 26

Athens, Greece

01 h 15 m

10:05

Wed, 20 May 26

Terminal T2

Sofia, Bulgaria

BAGGAGE : CHECK INCABIN

Information not available

FARES
Cabin bagCheck-inCancellationDate ChangeMeal

Standard

Fare offered by airlines.

1 Piece
1 Piece
Non-refundable fare
Free date change allowed
Get complimentary meals

₹ 1,12,870

Flex

Fare offered by airlines.

1 Piece
1 Piece
No airline cancellation fee
Free date change allowed
Get complimentary meals

₹ 1,22,920

Premium standard

Fare offered by airlines.

1 Piece
2 Pieces
Non-refundable fare
Free date change allowed
Get complimentary meals

₹ 1,53,365

Premium flex

Fare offered by airlines.

1 Piece
2 Pieces
No airline cancellation fee
Free date change allowed
Get complimentary meals

₹ 1,83,520

Boston Sofia Cheap Flights Fare Date
Lowest Airfare Today Rs 0
19 May
Cheapest Fare Within 30 Days Rs null
19 May
Cheapest Fare Within 90 Days Rs null
19 May
Cheapest Fare Within 365 Days Rs null
19 May

Get cheap flights from Boston to Sofia with Goibibo India

Q: Why choose Goibibo for your flight booking from Boston to Sofia?

A: Goibibo lets you search and compare flight tickets to various destinations with just a click. There is a huge inventory of airlines for you to choose from, and exciting deals and discounts so that you can book your flight tickets at reasonable prices. You can always reach out to Goibibo customer care for any help.

Q: How to get a cheap flight ticket from Boston to Sofia?

A: At Goibibio, it’s very simple to find cheap flights. • After entering the source and destination on the home page, you will get a list of flights. Click on the ‘Cheapest’ filter below to see the cheapest flights first. • You can also grab a cheap flight booking by setting up an alert for Boston to Sofia flights. Goibibo will let you know whenever there is a price drop for your flight. What’s the best time to book a flight from Boston to Sofia? • For a cheap domestic flight, try booking 3-4 weeks in advance. • For an international flight, you must book at least 7-8 weeks ahead for a better price. • You can also check the calendar view while booking to compare the prices for various dates. • Set up a price alert to get notified about the best prices for your flight from Boston to Sofia.

Q: What should you keep in mind while booking a flight from Boston to Sofia?

A: At Goibibo, you can compare flights from all major airlines at one go. Always keep an eye out for the best offers on your Boston to Sofia flight. Plus, there are no hidden charges when you book a Boston to Sofia flight on Goibibo.

Q: Is there any discount on a flight booking from Boston to Sofia?

A: Goibibo always has discount offers running on flights. You can find many coupons on the website and app for your Boston to Sofia booking. While booking, you can choose the best coupon from the list for an instant discount on your tickets.

Boston to Sofia Flights

Searching for Boston to Sofia cheap flights? Then, Goibibo is your one-stop destination to book Boston to Sofia flight in a hassle-free manner. It is one such platform that brings forth all the options for you at one place and lets you book the most suitable flight with the best deals and offers.

There is no dearth of options when it comes to Boston to Sofia Flight booking. Several budget and premium airlines fly on this route. You can easily check the Boston to Sofia flight schedule on Goibibo. There are approximately 20 flights flying daily between Boston and Sofia from early morning to late at night. Out of these Boston to Sofia flight, 0 are non stop flights 20 are connecting flights. Air Canada, Austrian Airlines, Bulgaria Air, Delta Air Lines, KLM Royal Dutch, Swiss, United Airlines are some major airlines that fly between Boston and Sofia.

The lowest airfare of Boston to Sofia flight is ₹50403 and the average airfare is 65874 depending on the airline, timings and availability. So, it is advisable to book domestic flights 2-3 weeks well in advance to avail minimum airfare. You can also book Boston to Sofia cheap flights if you are flexible with your dates and timings.

You will board your Boston to Sofia flight from the Boston Airport and deboard it at Sofia Airport.

You cannot only book Boston to Sofia cheap flight tickets through Goibibo but can also do web check-in and track your flight status.


How to book a Boston to Sofia flight ticket on Goibibo?
Booking flight tickets on Goibibo is very simple. For a Boston to Sofia flight, check below:
  • Enter your personal Goibibo account by hitting the ‘Sign In’ option on the top right of the desktop site. You can also create a new account by clicking on the ‘Sign Up’ option, followed by entering your mobile number or signing in with your personal Facebook account.
  • On the Goibibo homepage, you will see three options for booking flight tickets from Boston to Sofia. Choose one among one-way, round trip or multicity flights.
  • Fill in the city where you will board your flight from and the destination city. Choose a date of departure and enter the return date if you are booking a round trip flight. Select your preferred class of travel and add the number of passengers with whom you are travelling.
  • Hit the ‘Search’ button.
  • Within a second or two, you will be then redirected to another page with all the flights from Boston to Sofia – the topmost one will have the cheapest airfare.
  • On the left, you will find filters such as your desired time to board a flight, direct or connecting flights and the airline.
  • Apply as per your preference and click on the ‘Book’ option.
  • You can opt for an airport transfer and even choose a Travel Protection plan.
  • Before making the final payment, provide your personal details including your email address and mobile number. You can also use an available Promo Code FLYDREAM to get Rs 1500 as instant discount for your Boston to Sofia flight ticket.
  • Click on the ‘Proceed’ button.
  • After the payment, you will receive the e-ticket and the invoice for your Boston to Sofia flight on your email address.

  • How can I check the flight schedule for a Boston to Sofia flight?
    To check the Boston to Sofia flight schedule,
  • Visit https://www.goibibo.com/flight-schedule/
  • Choose from the one-way, round trip and multicity flight options.
  • Type in the cities of origin and arrival, and choose the date of departure for a one-way flight, the return date, in case, you have selected a round-trip or, the different dates of departures for a multicity booking.
  • After clicking on the ‘Get Set Go’ option, you will get the real-time flight schedule.

  • How much baggage can I carry on my Boston to Sofia flight?
    Baggage allowance depends on the class of travel and airline. In the Boston to Sofia Air India flight, 25 kg of checked baggage is allowed, while 8 kg of hand luggage is permitted. On the other hand, in all domestic IndiGo flights, a passenger can carry 7 kg of hand luggage and 15 kg of checked baggage.

     


    Where will I board my flight at Boston and deboard at Sofia?
    When you have booked a Boston to Sofia flight, you will board the flight at and de-board at .

     


    How can I do web check-in for my upcoming Boston at Sofia flight?
    To avail the web check-in service and avoid queues at airports, you have to visit the official airline websites. Commonly, you have to fill the cities of departure and arrival, PNR number and last name to select your preferred seats and meals.

     

    About Sofia

    undefined

    Airport Address

    Sofia Airport
    Tel: (02) 937 2211 (departures) |(02) 937 2212 (arrivals)

    About Boston

    undefined

    Airport Address

    Frequently Asked Questions - Boston to Sofia Flights

    Q: How many flights fly from Boston to Sofia on the daily basis?

    A: Around 20 flights are flying daily from Boston to Sofia. Out of which 0 are direct and 20 are connecting flights on this route. Some major airlines between this route are Air Canada, Austrian Airlines, Bulgaria Air, Delta Air Lines, KLM Royal Dutch, Swiss, United Airlines.

    Q: What are the name and codes for Boston and Sofia airports?

    A: The name of Boston airport is Boston Airport and its code is BOS and name of Sofia Airport is Sofia Airport, its code is SOF.

    Q: Which are the most preferred airlines from Boston to Sofia ?

    A: Air Canada, Austrian Airlines, Bulgaria Air, Delta Air Lines, KLM Royal Dutch, Swiss, United Airlines are the most preferred airlines on Boston to Sofia flight route.

    Q: Which is the last flight on Boston to Sofia route?

    A: The last flight from Boston to Sofia route is United Airlines at 19:27.

    Q: When does the first flight leave from Boston to Sofia?

    A: The first flight from Boston to Sofia is Air Canada at 05:10.

    Q: What is today’s cheapest fare from Boston to Sofia?

    A: Today lowest airfare on Boston to Sofia flight route is 0.

    Q: Which is the cheapest flight from Boston to Sofia in next 7 and next 30 days?

    A: Cheapest flight in next 7 days on Boston to Sofia route is at . And in next 30 days lowest price on Boston to Sofia route is .

    Q: Which airline has maximum number for flights between Boston to Sofia?

    A: Out of 20 daily flights between Boston to Sofia United Airlines has maximum 11 flights. After that Bulgaria Air has 4, KLM Royal Dutch has 3, Air Canada has 2, Delta Air Lines has 2, Swiss has 2, Austrian Airlines has 1 flights between Boston to Sofia.

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