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Sofia

$337+ Cheap flights from Boston (BOS) to Sofia (SOF)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/27. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SOF
Jan 3 — Jan 101
Sat 1/3
Sat 1/10
1 adult, Economy
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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

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Cheapflights Tip: The best prices from Boston Logan Intl to Sofia are usually found in October or February, booked 67 days in advance, depart on a Tuesday or Saturday and return on a Thursday

Cheap 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 December 4, 2025.

This KLM deal was found by Cheapflights users on 12/2. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/102:55 pmBOS - SOF
2 stops16h 10mMultiple Airlines
Wed 12/177:00 amSOF - BOS
1 stop13h 35mMultiple Airlines
Deal found 12/2$383
This oojo deal was found by Cheapflights users on 12/3. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/127:30 amBOS - SOF
1 stop20h 45mBritish Airways
Wed 12/249:00 pmSOF - BOS
1 stop29h 45mBritish Airways
Deal found 12/3$468
This Mytrip deal was found by Cheapflights users on 12/2. 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 12/56:15 amBOS - SOF
2 stops32h 05mMultiple Airlines
Sun 12/710:30 pmSOF - BOS
2 stops24h 27mMultiple Airlines
Deal found 12/2$559
This oojo deal was found by Cheapflights users on 12/2. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/56:05 amBOS - SOF
2 stops22h 10mBritish Airways
Sun 12/72:30 pmSOF - BOS
1 stop32h 30mBritish Airways
Deal found 12/2$576
This Mytrip deal was found by Cheapflights users on 12/3. 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 12/1210:45 amBOS - SOF
2 stops27h 35mMultiple Airlines
Wed 12/246:00 amSOF - BOS
2 stops16h 57mMultiple Airlines
Deal found 12/3$621
This CheapOair deal was found by Cheapflights users on 12/2. 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.
Wed 12/107:27 pmBOS - SOF
2 stops56h 48mBritish Airways
Wed 12/179:00 pmSOF - BOS
2 stops25h 15mBritish Airways
Deal found 12/2$635

Find 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 December 4, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$337
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$966
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
High demand for flights, 0% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($21 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 4, 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

Mon 1/19

8:40 pm-10:45 pm

1 stop19h 05m

Sofia

Wed 2/4

2:00 pm-6:57 pm

2 stops35h 57m

$344

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Thu 1/22

2:20 pm-1:15 pm

2 stops15h 55m

Sofia

Thu 2/5

2:00 pm-6:35 pm

1 stop11h 35m

$363

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 1/12

7:10 pm-2:05 pm

1 stop11h 55m

Sofia

Tue 1/27

7:10 am-1:40 pm

1 stop13h 30m

$378

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 5/5

5:10 pm-11:40 am

1 stop11h 30m

Sofia

Tue 5/19

4:05 pm-1:50 pm

1 stop28h 45m

$381

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 1/19

1:00 pm-2:05 pm

2 stops18h 05m

Sofia

Wed 2/4

7:00 am-6:27 pm

2 stops18h 27m

$386

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 1/13

6:30 pm-1:55 pm

1 stop12h 25m

Sofia

Tue 1/27

7:10 am-1:40 pm

1 stop13h 30m

$395

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 1/19

8:15 am-10:45 pm

2 stops31h 30m

Sofia

Wed 2/4

2:00 pm-6:35 pm

1 stop11h 35m

$396

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 1/13

2:20 pm-1:15 pm

2 stops15h 55m

Sofia

Tue 1/27

6:00 am-1:35 pm

1 stop14h 35m

$399

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Thu 1/22

2:20 pm-1:15 pm

2 stops15h 55m

Sofia

Thu 2/5

7:55 am-5:14 pm

2 stops16h 19m

$417

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 1/27

10:15 am-11:50 am

2 stops18h 35m

Sofia

Tue 2/10

2:15 pm-9:32 am

3 stops26h 17m

$420

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/2

Showing 1-10 of 20 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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
AranGrantPrice Accuracy2 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*2 stars
Trip.comPrice Accuracy2 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 Mytrip to be most consistent on Cheapflights vs. Mytrip Users can find the same prices on Boston-Sofia flight deals on Cheapflights vs. Mytrip >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 Mytrip the most. Mytrip 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 November 28, 2025.

The best time to book flights from Boston to Sofia is 67 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, January is the cheapest month in which you can book a flight from Boston to Sofia (average of $394). Flying from Boston to Sofia in May is currently the most expensive (average of $609). 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 December 4, 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 20% versus a flight in the morning.

How much does it cost to fly round-trip from Boston to Sofia?

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 December 4, 2025.
Peruse reviews from past customers who have flown with KLM, United Airlines, and Turkish Airlines from Boston to Sofia to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,430 reviews

Boarding

7.8

Food

7.2

Entertainment

7.1

Crew

8.4

Comfort

7.6

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
KLM
7.7
Good
1,430 reviews
KLM
7.7
Good
1,430 reviews

Boarding

7.8

Food

7.2

Entertainment

7.1

Crew

8.4

Comfort

7.6

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
United Airlines
7.4
Good
9,066 reviews
KLM
7.7
Good
1,430 reviews

Boarding

7.8

Food

7.2

Entertainment

7.1

Crew

8.4

Comfort

7.6

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
Turkish Airlines
7.3
Good
4,077 reviews
KLM
7.7
Good
1,430 reviews

Boarding

7.8

Food

7.2

Entertainment

7.1

Crew

8.4

Comfort

7.6

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
Lufthansa
6.8
Okay
7,612 reviews
KLM
7.7
Good
1,430 reviews

Boarding

7.8

Food

7.2

Entertainment

7.1

Crew

8.4

Comfort

7.6

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
British Airways
6.7
Okay
7,562 reviews
KLM
7.7
Good
1,430 reviews

Boarding

7.8

Food

7.2

Entertainment

7.1

Crew

8.4

Comfort

7.6

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle

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.

  • How long is the flight from Boston to Sofia?

    Lufthansa, Austrian Airlines, and KLM can get you from Boston to Sofia in just under 11h 30m. Your travel time can differ by up to 7h 35m. The distance between Boston and Sofia is about 4521 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    KLM, at $409, was found to be the cheapest airline from Boston to Sofia.Alternate airlines to your destination round-trip include Air France and Austrian Airlines. KLM is 44% 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 $395 on Lufthansa. Other airlines that offer cheap prices include Austrian Airlines from $409 and Turkish Airlines from $424 one-way.

  • 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, January is the cheapest month in which you can book a flight from Boston to Sofia (average of $394). Flying from Boston to Sofia in May is currently the most expensive (average of $609). 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

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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 December 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$409Average$672FlexibilityNo cancel feeOn-time75%
Air FranceCheapest$416Average$562FlexibilityNo cancel feeOn-time77%
Austrian AirlinesCheapest$422Average$712FlexibilityNo cancel feeOn-time78%
SWISSCheapest$436Average$718FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$439Average$764FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$449Average$856FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$482Average$540FlexibilityNo cancel feeOn-time70%
ITA AirwaysCheapest$505Average$924FlexibilityNo cancel feeOn-time81%
Turkish AirlinesCheapest$525Average$674FlexibilityNo cancel feeOn-time77%

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