HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Sofia

$296+ Cheap flights from Boston (BOS) to Sofia (SOF)

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 4/22. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SOF
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Boston to Sofia with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Boston Logan Intl to Sofia are usually found in October or November, booked 62 days in advance, depart on a Tuesday or Saturday and return on a Thursday

Cheap flight deals from Boston to Sofia

Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to Sofia (SOF). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated April 17, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$565
(CheapOair)

One-way from

$455
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$859
Provider with most accurate pricing for Boston Logan Intl-Sofia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boston Logan Intl-Sofia flights.
Search Deals
From Boston Logan Intl to Sofia
Search Deals
One-way flight from Boston Logan Intl to Sofia
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($46 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($34 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

Find flight deals from Boston to Sofia

Cheapest flights from Boston to Sofia
Explore the most affordable flight options available from Boston to Sofia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 17, 2025.

This CheapOair deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/19:55 pmBOS - SOF
1 stop14h 15mBritish Airways
Mon 6/168:00 pmSOF - BOS
1 stop33h 35mBritish Airways
Deal found 4/16$565
This Mytrip deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/167:15 pmBOS - SOF
2 stops22h 50mMultiple Airlines
Fri 5/236:15 amSOF - BOS
2 stops18h 35mMultiple Airlines
Deal found 4/16$625
This Trip.com deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/39:35 pmBOS - SOF
1 stop34h 10mTurkish Airlines
Fri 10/109:25 amSOF - BOS
1 stop17h 15mTurkish Airlines
Deal found 4/16$636
This FlightHub deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/215:05 pmBOS - SOF
1 stop12h 25mSWISS
Mon 8/253:30 pmSOF - BOS
1 stop30h 55mSWISS
Deal found 4/17$639
This CheapOair deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/15:50 pmBOS - SOF
2 stops22h 10mLufthansa
Tue 8/266:00 amSOF - BOS
1 stop18h 40mLufthansa
Deal found 4/16$645
This American Airlines deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/67:29 pmBOS - SOF
2 stops16h 56mAmerican Airlines
Wed 11/193:00 pmSOF - BOS
1 stop30h 00mAmerican Airlines
Deal found 4/17$689
This United Airlines deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/256:40 pmBOS - SOF
2 stops41h 10mUnited Airlines
Mon 11/32:15 pmSOF - BOS
2 stops31h 23mUnited Airlines
Deal found 4/16$701
This Gurufare deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/68:40 pmBOS - SOF
2 stops32h 25mITA Airways
Wed 9/1012:55 pmSOF - BOS
1 stop31h 45mITA Airways
Deal found 4/15$711
This Booking.com deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1810:20 amBOS - SOF
2 stops25h 20mAir Canada
Mon 9/2912:00 pmSOF - BOS
2 stops33h 31mAir Canada
Deal found 4/16$742

Cheapflights Fare Finder

Customize your flight search to find flights from Boston to Sofia 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, Cheapflights users made 2,558,603 searches. Data last updated April 17, 2025.
Use the filters below to find and compare flights from Boston to Sofia that are best for you.

Fly from

Boston

Fly to

Sofia

Route

Depart

Return

Price

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 6/1

9:55 pm-7:10 pm

1 stop14h 15m

Sofia

Mon 6/16

8:00 pm-10:35 pm

1 stop33h 35m

$565

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Fri 5/16

7:15 pm-1:05 am

2 stops22h 50m

Sofia

Fri 5/23

6:15 am-5:50 pm

2 stops18h 35m

$625

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Fri 10/3

9:35 pm-2:45 pm

1 stop34h 10m

Sofia

Fri 10/10

9:25 am-7:40 pm

1 stop17h 15m

$636

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 7/21

5:05 pm-12:30 pm

1 stop12h 25m

Sofia

Mon 8/25

3:30 pm-3:25 pm

1 stop30h 55m

$639

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Fri 8/1

5:50 pm-11:00 pm

2 stops22h 10m

Sofia

Tue 8/26

6:00 am-5:40 pm

1 stop18h 40m

$645

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sat 9/6

8:40 pm-12:05 pm

2 stops32h 25m

Sofia

Wed 9/10

12:55 pm-1:40 pm

1 stop31h 45m

$711

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 7/30

10:00 pm-10:50 pm

1 stop17h 50m

Sofia

Fri 8/15

6:00 am-5:40 pm

1 stop18h 40m

$738

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 8/18

10:20 am-6:40 pm

2 stops25h 20m

Sofia

Mon 9/29

12:00 pm-2:31 pm

2 stops33h 31m

$742

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 4/22

11:35 pm-12:25 pm

3 stops29h 50m

$296

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 7/22

9:40 pm-10:05 am

1 stop29h 25m

$466

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

Showing 1-10 of 15 results
1
2

Compare providers for flights from Boston to Sofia

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boston to Sofia in April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Boston-Sofia flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Boston-Sofia flight deals on Cheapflights vs. AranGrant >95% of the time. Price accuracy is based on data collected from Boston-Sofia flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Boston-Sofia flights, Cheapflights users trust AranGrant the most. AranGrant has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boston-Sofia flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Boston to Sofia

Have a flexible travel schedule? Discover the best time to fly to Sofia from Boston with our price prediction graph.
Estimated round-trip 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 Sofia

How far ahead should I book a flight from Boston to Sofia?

Use this chart to determine the optimal time to book a round-trip flight from Boston to Sofia. Price data was last updated on April 11, 2025.

The best time to book flights from Boston to Sofia is 62 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, November is the cheapest month in which you can book a flight from Boston to Sofia (average of $632). Flying from Boston to Sofia in June is currently the most expensive (average of $1,243). 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.

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

Find hourly flight availability from Boston to Sofia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 17, 2025.

When flying from Boston to Sofia, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 21% versus a flight in the morning.

Rainfall in Sofia by month

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

In terms of precipitation, rainfall in Sofia ranges from 1.2 - 2.8 inches per month. June is typically the wettest month, when rainfall can reach 2.8 in. January is typically the driest time to visit Sofia when rainfall is around 1.2 in.

Temperature in Sofia by month

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

If weather is an important factor for your trip to Sofia, 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 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

Reviews of airlines servicing Sofia

Get insights into the airlines that provide service to Sofia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Sofia. Reviews last updated April 17, 2025.
Austrian Airlines
7.6
Good
775 reviews

Entertainment

6.8

Boarding

7.6

Comfort

7.3

Food

6.7

Crew

8.1

Overall

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
Austrian Airlines
7.6
Good
775 reviews
Austrian Airlines
7.6
Good
775 reviews

Entertainment

6.8

Boarding

7.6

Comfort

7.3

Food

6.7

Crew

8.1

Overall

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
Air France
7.5
Good
1,435 reviews
Austrian Airlines
7.6
Good
775 reviews

Entertainment

6.8

Boarding

7.6

Comfort

7.3

Food

6.7

Crew

8.1

Overall

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
SWISS
7.5
Good
1,580 reviews
Austrian Airlines
7.6
Good
775 reviews

Entertainment

6.8

Boarding

7.6

Comfort

7.3

Food

6.7

Crew

8.1

Overall

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
United Airlines
7.4
Good
8,667 reviews
Austrian Airlines
7.6
Good
775 reviews

Entertainment

6.8

Boarding

7.6

Comfort

7.3

Food

6.7

Crew

8.1

Overall

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.
Turkish Airlines
7.3
Good
3,769 reviews
Austrian Airlines
7.6
Good
775 reviews

Entertainment

6.8

Boarding

7.6

Comfort

7.3

Food

6.7

Crew

8.1

Overall

7.6

Reviews

1 / 20
8.0
Excellent

Ely,Mar 2025

VIE - PMI

Luggage at destination was not split into priorities. Had business and only got my bag after 20 minutes, almost towards the end and I was in a rush, so the "priority" was completely ignored.

Related info for your journey

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

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

    British Airways, at $565, was found to be the cheapest airline from Boston to Sofia.Alternate airlines to your destination round-trip include Turkish Airlines and SWISS. British Airways is 34% cheaper than the average price of flights available within the next 90 days to this destination.

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

    One-way options have recently been found by users for as low as $462 on Lufthansa. Other airlines that offer cheap prices include Austrian Airlines from $476 and Air Serbia from $638 one-way.

  • Where are the most common layover locations when flying from Boston to Sofia?

    Flights departing from Boston and landing in Sofia layover in Frankfurt am Main most frequently.

  • What are some popular things to do or see while on a layover in Frankfurt am Main?

    Most Frankfurt am Main visitors opt to spend their time experiencing Römerberg, Hauptwache, and Konstablerwache. Travelers on a layover in Frankfurt am Main can visit Römerberg, Hauptwache, and Konstablerwache, by traveling 7.4 mi, 7.4 mi, and 7.7 mi, respectively after landing at Frankfurt am Main. Those looking to explore during their layover in Frankfurt am Main can rent a car from Frankfurt am Main for about $42 per day.

  • Where are the least popular layover locations for Boston to Sofia flights?

    The least popular layover on flights from Boston to Sofia is Munich.

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

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

  • How can I find direct flights from Boston to Sofia?

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

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

    Yes. Cheapflights offers flight deals from Boston to Sofia 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 Sofia?

    Currently, November is the cheapest month in which you can book a flight from Boston to Sofia (average of $632). Flying from Boston to Sofia in June is currently the most expensive (average of $1,243). 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

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

Alternative routes for Boston to Sofia

See prices for flight routes from nearby airports that may be better suited for you.
Hartford to Sofia flights

Top 9 airlines flying from Boston to Sofia

Discover the top 9 airlines that operate flights from Boston to Sofia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$514Average$608FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$550Average$825FlexibilityNo cancel feeOn-time70%
SWISSCheapest$558Average$847FlexibilityNo cancel feeOn-time79%
KLMCheapest$624Average$870FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$637Average$948FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$683Average$940FlexibilityNo cancel feeOn-time76%
Air FranceCheapest$687Average$952FlexibilityNo cancel feeOn-time77%
ITA AirwaysCheapest$742Average$931FlexibilityNo cancel feeOn-time81%
Austrian AirlinesCheapest$754Average$973FlexibilityNo cancel feeOn-time78%

100% Free

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

Book with Flexibility

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

Travel Smart

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.