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$246+ 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 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SOF
ago. 23 — ago. 301
sáb. 8/23
sáb. 8/30
1 adult, Economy
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Cheapflights Tip: The best prices from Boston Logan Intl to Sofia are usually found in October or November, booked 67 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 agosto 18, 2025.

Round-trip from

$441
(Booking.com)

One-way from

$246
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$866
From Boston Logan Intl to Sofia
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One-way flight from Boston Logan Intl to Sofia
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Highest demand for flights based on searches. 9% potential increase in price ($85 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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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 agosto 18, 2025.

This Mytrip deal was found by Cheapflights users on 8/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/76:00 amBOS - SOF
2 stops22h 15mMultiple Airlines
lun. 9/2212:45 pmSOF - BOS
2 stops33h 40mMultiple Airlines
Deal found 8/17$445
This United Airlines deal was found by Cheapflights users on 8/16. 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.
lun. 8/255:05 pmBOS - SOF
2 stops22h 55mUnited Airlines
vie. 10/178:00 amSOF - BOS
2 stops22h 59mUnited Airlines
Deal found 8/16$447
This United Airlines deal was found by Cheapflights users on 8/16. 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.
mié. 10/15:10 pmBOS - SOF
1 stop11h 30mUnited Airlines
mar. 10/146:00 amSOF - BOS
1 stop18h 40mUnited Airlines
Deal found 8/16$448
This CheapOair deal was found by Cheapflights users on 8/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/316:40 pmBOS - SOF
2 stops35h 20mAir Canada
mar. 9/306:20 amSOF - BOS
2 stops22h 05mAir Canada
Deal found 8/17$449
This United Airlines deal was found by Cheapflights users on 8/16. 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.
mar. 9/168:05 pmBOS - SOF
1 stop19h 55mUnited Airlines
mar. 9/308:00 amSOF - BOS
2 stops16h 54mUnited Airlines
Deal found 8/16$452
This Mytrip deal was found by Cheapflights users on 8/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/99:40 pmBOS - SOF
1 stop29h 25mSWISS
jue. 10/2310:50 amSOF - BOS
1 stop11h 35mSWISS
Deal found 8/17$453
This Gurufare deal was found by Cheapflights users on 8/18. 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.
lun. 12/18:40 pmBOS - SOF
1 stop14h 40mLufthansa
sáb. 2/287:05 pmSOF - BOS
1 stop30h 30mLufthansa
Deal found 8/18$455
This KAYAK deal was found by Cheapflights users on 8/16. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/112:10 pmBOS - SOF
2 stops28h 45mAustrian Airlines
mié. 10/88:00 amSOF - BOS
1 stop12h 50mAustrian Airlines
Deal found 8/16$457
This United Airlines deal was found by Cheapflights users on 8/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 9/76:30 pmBOS - SOF
2 stops35h 30mUnited Airlines
lun. 9/226:00 amSOF - BOS
2 stops40h 25mUnited Airlines
Deal found 8/17$459
This FlightHub deal was found by Cheapflights users on 8/18. 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.
lun. 9/88:05 pmBOS - SOF
1 stop15h 35mLufthansa
lun. 9/156:40 pmSOF - BOS
1 stop28h 20mLufthansa
Deal found 8/18$461
This CrystalTravel deal was found by Cheapflights users on 8/17. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/68:05 pmBOS - SOF
1 stop19h 55mLufthansa
mar. 9/3012:45 pmSOF - BOS
1 stop11h 55mLufthansa
Deal found 8/17$462
This KAYAK deal was found by Cheapflights users on 8/16. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 10/59:40 pmBOS - SOF
2 stops31h 20mSWISS
lun. 10/133:30 pmSOF - BOS
1 stop30h 55mSWISS
Deal found 8/16$463

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 agosto 18, 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

vie. 1/16

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

vie. 1/30

2:00 pm-6:35 pm

1 stop11h 35m

$441

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

dom. 1/18

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

dom. 2/1

7:05 pm-6:35 pm

1 stop30h 30m

$445

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

dom. 1/18

8:40 pm-6:20 pm

1 stop14h 40m

Sofia

dom. 2/1

7:05 pm-6:35 pm

1 stop30h 30m

$445

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

dom. 9/7

6:00 am-11:15 am

2 stops22h 15m

Sofia

lun. 9/22

12:45 pm-3:25 pm

2 stops33h 40m

$445

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

lun. 10/6

12:10 pm-12:00 pm

2 stops16h 50m

Sofia

mar. 10/14

6:00 am-5:40 pm

1 stop18h 40m

$447

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

mié. 10/1

5:10 pm-11:40 am

1 stop11h 30m

Sofia

mar. 10/14

6:00 am-5:40 pm

1 stop18h 40m

$448

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

mié. 10/1

5:10 pm-11:40 am

1 stop11h 30m

Sofia

jue. 10/9

12:45 pm-5:40 pm

1 stop11h 55m

$448

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

dom. 9/7

9:40 pm-12:30 pm

1 stop31h 50m

Sofia

dom. 9/21

6:00 am-9:30 am

2 stops34h 30m

$448

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

mié. 10/1

5:10 pm-11:40 am

1 stop11h 30m

Sofia

vie. 10/10

8:00 am-1:50 pm

1 stop12h 50m

$448

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

dom. 8/31

6:40 pm-1:00 pm

2 stops35h 20m

Sofia

mar. 9/30

6:20 am-9:25 pm

2 stops22h 05m

$449

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/16

Showing 1-10 of 19 results
1
2

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 August 8, 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, 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 $1,186). 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 agosto 18, 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.

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 agosto 18, 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
7.8
Good
1,385 reviews

Comfort

7.7

Entertainment

7.1

Boarding

7.8

Overall

7.8

Food

7.3

Crew

8.4

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
KLM
7.8
Good
1,385 reviews
KLM
7.8
Good
1,385 reviews

Comfort

7.7

Entertainment

7.1

Boarding

7.8

Overall

7.8

Food

7.3

Crew

8.4

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
United Airlines
7.4
Good
8,925 reviews
KLM
7.8
Good
1,385 reviews

Comfort

7.7

Entertainment

7.1

Boarding

7.8

Overall

7.8

Food

7.3

Crew

8.4

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Turkish Airlines
7.3
Good
3,945 reviews
KLM
7.8
Good
1,385 reviews

Comfort

7.7

Entertainment

7.1

Boarding

7.8

Overall

7.8

Food

7.3

Crew

8.4

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Lufthansa
6.8
Okay
7,330 reviews
KLM
7.8
Good
1,385 reviews

Comfort

7.7

Entertainment

7.1

Boarding

7.8

Overall

7.8

Food

7.3

Crew

8.4

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
British Airways
6.7
Okay
7,277 reviews
KLM
7.8
Good
1,385 reviews

Comfort

7.7

Entertainment

7.1

Boarding

7.8

Overall

7.8

Food

7.3

Crew

8.4

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

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 and United Airlines can get you from Boston to Sofia in just under 14h 40m. Your travel time can differ by up to 2h 10m. 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?

    Air France, at $416, was found to be the cheapest airline from Boston to Sofia.Alternate airlines to your destination round-trip include KLM and SWISS. Air France is 48% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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 $1,186). 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 agosto 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air FranceCheapest$416Average$725FlexibilityNo cancel feeOn-time77%
KLMCheapest$432Average$802FlexibilityNo cancel feeOn-time75%
SWISSCheapest$437Average$766FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$505Average$808FlexibilityNo cancel feeOn-time69%
ITA AirwaysCheapest$505Average$924FlexibilityNo cancel feeOn-time81%
Turkish AirlinesCheapest$507Average$635FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$510Average$561FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$570Average$877FlexibilityNo cancel feeOn-time76%
Austrian AirlinesCheapest$595Average$847FlexibilityNo cancel feeOn-time78%

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