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Sofia

$383+ 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 7/20. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SOF
Aug 1 — Aug 81
Sat 8/1
Sat 8/8
1 adult, Economy
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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 July 2, 2026.

This FlightHub deal was found by Cheapflights users on 7/1. 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 7/139:50 pm
BOS
-
SOF
1 stop34h 10m
Turkish Airlines
Tue 7/219:35 am
SOF
-
BOS
1 stop17h 20m
Turkish Airlines
Deal found 7/1$822
This oojo deal was found by Cheapflights users on 7/1. 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.
Tue 7/287:27 pm
BOS
-
SOF
2 stops16h 13m
Lufthansa
Wed 8/266:10 am
SOF
-
BOS
2 stops24h 49m
Lufthansa
Deal found 7/1$824
This Mytrip deal was found by Cheapflights users on 7/1. 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 9/113:35 pm
BOS
-
SOF
2 stops26h 40m
Multiple Airlines
Fri 9/2510:10 pm
SOF
-
BOS
2 stops24h 30m
Multiple Airlines
Deal found 7/1$825
This Mytrip deal was found by Cheapflights users on 7/1. 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 10/308:50 pm
BOS
-
SOF
3 stops20h 20m
Multiple Airlines
Fri 11/137:45 pm
SOF
-
BOS
3 stops31h 10m
Multiple Airlines
Deal found 7/1$826
This United Airlines deal was found by Cheapflights users on 7/1. 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.
Tue 12/88:40 pm
BOS
-
SOF
1 stop19h 05m
United Airlines
Fri 1/87:55 am
SOF
-
BOS
1 stop12h 35m
United Airlines
Deal found 7/1$831
This United Airlines deal was found by Cheapflights users on 7/1. 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.
Wed 12/92:16 pm
BOS
-
SOF
2 stops15h 59m
United Airlines
Fri 1/87:55 am
SOF
-
BOS
1 stop12h 35m
United Airlines
Deal found 7/1$832
This Mytrip deal was found by Cheapflights users on 6/29. 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.
Tue 7/285:45 pm
BOS
-
SOF
2 stops15h 00m
Multiple Airlines
Wed 8/269:40 pm
SOF
-
BOS
2 stops27h 02m
Multiple Airlines
Deal found 6/29$833
This United Airlines deal was found by Cheapflights users on 7/1. 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.
Wed 12/92:16 pm
BOS
-
SOF
2 stops15h 59m
United Airlines
Wed 1/62:00 pm
SOF
-
BOS
1 stop11h 35m
United Airlines
Deal found 7/1$834
This Kiwi.com deal was found by Cheapflights users on 7/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1911:00 pm
BOS
-
SOF
2 stops42h 50m
Multiple Airlines
Sat 10/39:50 pm
SOF
-
BOS
1 stop28h 55m
Multiple Airlines
Deal found 7/1$835
This Mytrip deal was found by Cheapflights users on 6/28. 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.
Thu 8/134:45 pm
BOS
-
SOF
3 stops27h 15m
Multiple Airlines
Mon 8/317:30 pm
SOF
-
BOS
2 stops26h 15m
Multiple Airlines
Deal found 6/28$836
This Kiwi.com deal was found by Cheapflights users on 6/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2711:35 pm
BOS
-
SOF
1 stop19h 00m
Multiple Airlines
Sun 10/182:15 pm
SOF
-
BOS
2 stops35h 35m
Multiple Airlines
Deal found 6/30$837
This United Airlines deal was found by Cheapflights users on 7/1. 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.
Wed 12/910:30 am
BOS
-
SOF
2 stops19h 45m
United Airlines
Thu 12/317:55 am
SOF
-
BOS
2 stops16h 30m
United Airlines
Deal found 7/1$838

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 July 2, 2026.

Most accurate provider

Ovago
3 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$822
(FlightHub)

One-way from

$383
(Kiwi.com)

Popular in

May

Cheapest in

February

Average price

$731
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. 23% potential increase in price ($199 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($34 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
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 July 2, 2026.
Use the filters below to find and compare flights from Boston to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 10/18

8:05 pm-6:40 pm

1 stop15h 35m

Sofia

Wed 10/21

8:00 am-1:50 pm

1 stop12h 50m

$839

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 12/9

4:05 pm-6:10 pm

1 stop19h 05m

Sofia

Wed 1/6

2:00 pm-6:35 pm

1 stop11h 35m

$855

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 8/17

8:05 pm-11:15 pm

1 stop20h 10m

Sofia

Mon 8/31

7:25 pm-5:40 pm

1 stop29h 15m

$869

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 8/24

8:05 pm-11:15 pm

1 stop20h 10m

Sofia

Tue 9/8

8:00 am-1:50 pm

1 stop12h 50m

$871

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Fri 12/11

12:30 pm-1:15 pm

2 stops17h 45m

Sofia

Thu 1/7

7:55 am-5:25 pm

2 stops16h 30m

$888

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 7/14

9:25 am-12:10 pm

2 stops19h 45m

Sofia

Tue 8/25

8:00 am-10:18 am

2 stops33h 18m

$891

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 7/29

10:40 am-6:40 pm

2 stops25h 00m

Sofia

Wed 8/12

7:00 pm-5:40 pm

2 stops29h 40m

$892

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Fri 12/25

7:40 pm-10:45 pm

2 stops44h 05m

Sofia

Fri 1/8

6:00 am-10:37 pm

2 stops23h 37m

$903

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 7/12

9:50 pm-3:00 pm

1 stop34h 10m

Sofia

Sun 7/19

3:50 pm-7:55 pm

1 stop35h 05m

$912

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Thu 7/16

9:50 pm-3:00 pm

1 stop34h 10m

Sofia

Sun 7/19

9:10 pm-7:55 pm

1 stop29h 45m

$912

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/29

Showing 1-10 of 16 resultsSorted by cheapest first
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 July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
OvagoPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
MytripPrice Accuracy3 starsTrust Score*3 stars
Trip.comPrice Accuracy1 starTrust 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 Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Boston-Sofia flight deals on Cheapflights vs. Ovago >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 Ovago the most. Ovago 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?

The best time to book flights from Boston to Sofia is 59 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, February is the cheapest month in which you can book a flight from Boston to Sofia (average of $460). Flying from Boston to Sofia in May is currently the most expensive (average of $1,006). 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.

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 July 2, 2026.
Peruse reviews from past customers who have flown with KLM,Turkish Airlines, andUnited 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
7.8
Good
1,532 reviews

Boarding

7.8

Crew

8.4

Entertainment

7.2

Comfort

7.7

Food

7.3

Overall

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
KLM
7.8
Good
1,532 reviews
KLM
7.8
Good
1,532 reviews

Boarding

7.8

Crew

8.4

Entertainment

7.2

Comfort

7.7

Food

7.3

Overall

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
Turkish Airlines
7.4
Good
4,438 reviews
KLM
7.8
Good
1,532 reviews

Boarding

7.8

Crew

8.4

Entertainment

7.2

Comfort

7.7

Food

7.3

Overall

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
United Airlines
7.4
Good
9,927 reviews
KLM
7.8
Good
1,532 reviews

Boarding

7.8

Crew

8.4

Entertainment

7.2

Comfort

7.7

Food

7.3

Overall

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
Lufthansa
6.8
Okay
8,108 reviews
KLM
7.8
Good
1,532 reviews

Boarding

7.8

Crew

8.4

Entertainment

7.2

Comfort

7.7

Food

7.3

Overall

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
ITA Airways
6.7
Okay
1,271 reviews
KLM
7.8
Good
1,532 reviews

Boarding

7.8

Crew

8.4

Entertainment

7.2

Comfort

7.7

Food

7.3

Overall

7.8

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful

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?

    United Airlines and Lufthansa can get you from Boston to Sofia in just under 15h 35m. Your travel time can differ by up to 4h 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?

    United Airlines, at $394, was found to be the cheapest airline from Boston to Sofia.Alternate airlines to your destination round-trip include Austrian Airlines and Lufthansa. United Airlines is 38% 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 $211 on Austrian Airlines. Other airlines that offer cheap prices include KLM from $218 and Lufthansa from $335 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, February is the cheapest month in which you can book a flight from Boston to Sofia (average of $460). Flying from Boston to Sofia in May is currently the most expensive (average of $1,006). 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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Complete your trip

Complete your trip to Sofia by adding a car rental and/or hotel reservation to your travel itinerary.
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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 July 2, 2026.
AirlineCheapestAverageFlexibilityOn-time
Austrian AirlinesCheapest$394Average$548FlexibilityNo cancel feeOn-time78%
United AirlinesCheapest$394Average$653FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$395Average$583FlexibilityNo cancel feeOn-time76%
Air FranceCheapest$396Average$496FlexibilityNo cancel feeOn-time77%
KLMCheapest$403Average$553FlexibilityNo cancel feeOn-time75%
SWISSCheapest$410Average$527FlexibilityNo cancel feeOn-time79%
British AirwaysCheapest$421Average$536FlexibilityNo cancel feeOn-time70%
Turkish AirlinesCheapest$524Average$737FlexibilityNo cancel feeOn-time77%
ITA AirwaysCheapest$694Average$1,034FlexibilityNo cancel feeOn-time81%

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