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Sofia

$185+ 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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SOF
Jul 16 — Jul 231
Wed 7/16
Wed 7/23
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 July 11, 2025.

Round-trip from

$461
(United Airlines)

One-way from

$185
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$861
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. 6% potential increase in price ($55 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($34 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 11, 2025.

This United Airlines deal was found by Cheapflights users on 7/10. 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.
Sun 12/78:40 pmBOS - SOF
1 stop19h 05mUnited Airlines
Sun 12/216:15 amSOF - BOS
2 stops24h 39mUnited Airlines
Deal found 7/10$461
This Air France deal was found by Cheapflights users on 7/9. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/105:20 pmBOS - SOF
1 stop13h 40mAir France
Fri 10/247:00 amSOF - BOS
1 stop13h 40mAir France
Deal found 7/9$471
This Orbitz deal was found by Cheapflights users on 7/9. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/315:05 pmBOS - SOF
2 stops11h 55mMultiple Airlines
Mon 9/226:55 pmSOF - BOS
2 stops29h 52mMultiple Airlines
Deal found 7/9$473
This Kiwi.com deal was found by Cheapflights users on 7/9. 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.
Thu 8/289:40 pmBOS - SOF
1 stop29h 25mSWISS
Thu 9/1110:50 amSOF - BOS
1 stop11h 35mSWISS
Deal found 7/9$478
This FlightHub deal was found by Cheapflights users on 7/9. 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.
Thu 11/68:40 pmBOS - SOF
1 stop19h 05mLufthansa
Thu 11/201:55 pmSOF - BOS
1 stop11h 40mLufthansa
Deal found 7/9$492
This FlightHub deal was found by Cheapflights users on 7/9. 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 7/218:59 pmBOS - SOF
2 stops32h 06mITA Airways
Mon 8/2512:55 pmSOF - BOS
1 stop31h 45mITA Airways
Deal found 7/9$532
This Air Canada deal was found by Cheapflights users on 7/10. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/36:00 amBOS - SOF
2 stops24h 25mAir Canada
Wed 10/86:00 amSOF - BOS
2 stops23h 39mAir Canada
Deal found 7/10$533
This Expedia deal was found by Cheapflights users on 7/9. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/610:43 amBOS - SOF
2 stops19h 17mBritish Airways
Sat 12/2012:05 pmSOF - BOS
1 stop14h 40mBritish Airways
Deal found 7/9$541
This oojo deal was found by Cheapflights users on 7/9. 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 10/146:10 pmBOS - SOF
2 stops16h 40mTAP AIR PORTUGAL
Sat 10/182:05 pmSOF - BOS
2 stops31h 15mTAP AIR PORTUGAL
Deal found 7/9$570

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 11, 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 12/7

8:40 pm-10:45 pm

1 stop19h 05m

Sofia

Sun 12/21

6:15 am-11:54 pm

2 stops24h 39m

$461

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Fri 10/10

5:20 pm-2:00 pm

1 stop13h 40m

Sofia

Fri 10/24

7:00 am-1:40 pm

1 stop13h 40m

$471

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sun 8/31

5:05 pm-12:00 pm

2 stops11h 55m

Sofia

Mon 9/22

6:55 pm-5:47 pm

2 stops29h 52m

$473

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Thu 8/28

9:40 pm-10:05 am

1 stop29h 25m

Sofia

Thu 9/11

10:50 am-3:25 pm

1 stop11h 35m

$478

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Thu 11/6

8:40 pm-10:45 pm

1 stop19h 05m

Sofia

Thu 11/20

1:55 pm-6:35 pm

1 stop11h 40m

$492

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 7/21

8:59 pm-12:05 pm

2 stops32h 06m

Sofia

Mon 8/25

12:55 pm-1:40 pm

1 stop31h 45m

$532

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Fri 10/3

6:00 am-1:25 pm

2 stops24h 25m

Sofia

Wed 10/8

6:00 am-10:39 pm

2 stops23h 39m

$533

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sat 12/6

10:43 am-1:00 pm

2 stops19h 17m

Sofia

Sat 12/20

12:05 pm-7:45 pm

1 stop14h 40m

$541

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 10/14

6:10 pm-5:50 pm

2 stops16h 40m

Sofia

Sat 10/18

2:05 pm-2:20 pm

2 stops31h 15m

$570

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Wed 10/15

11:00 pm-12:30 am

1 stop18h 30m

$185

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/10

Showing 1-10 of 12 results
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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 June 27, 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 July 11, 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 July 11, 2025.
Peruse reviews from past customers who have flown with Austrian Airlines, Air France, and United 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.
Austrian Airlines
7.6
Good
808 reviews

Crew

8.1

Food

6.8

Comfort

7.3

Boarding

7.6

Entertainment

6.8

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Dominik,Jun 2025

VIE - VNO

Good service and update all information. I feel like i wanna use it again next time
Austrian Airlines
7.6
Good
808 reviews
Austrian Airlines
7.6
Good
808 reviews

Crew

8.1

Food

6.8

Comfort

7.3

Boarding

7.6

Entertainment

6.8

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Dominik,Jun 2025

VIE - VNO

Good service and update all information. I feel like i wanna use it again next time
Air France
7.5
Good
1,467 reviews
Austrian Airlines
7.6
Good
808 reviews

Crew

8.1

Food

6.8

Comfort

7.3

Boarding

7.6

Entertainment

6.8

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Dominik,Jun 2025

VIE - VNO

Good service and update all information. I feel like i wanna use it again next time
United Airlines
7.4
Good
8,846 reviews
Austrian Airlines
7.6
Good
808 reviews

Crew

8.1

Food

6.8

Comfort

7.3

Boarding

7.6

Entertainment

6.8

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Dominik,Jun 2025

VIE - VNO

Good service and update all information. I feel like i wanna use it again next time
Turkish Airlines
7.3
Good
3,896 reviews
Austrian Airlines
7.6
Good
808 reviews

Crew

8.1

Food

6.8

Comfort

7.3

Boarding

7.6

Entertainment

6.8

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Dominik,Jun 2025

VIE - VNO

Good service and update all information. I feel like i wanna use it again next time
Air Canada
7.1
Good
9,695 reviews
Austrian Airlines
7.6
Good
808 reviews

Crew

8.1

Food

6.8

Comfort

7.3

Boarding

7.6

Entertainment

6.8

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Dominik,Jun 2025

VIE - VNO

Good service and update all information. I feel like i wanna use it again next time

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?

    United Airlines, at $461, was found to be the cheapest airline from Boston to Sofia.Alternate airlines to your destination round-trip include Lufthansa and Air Canada. United Airlines is 45% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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 Historisches Museum Frankfurt. Travelers on a layover in Frankfurt am Main can visit Römerberg, Hauptwache, and Historisches Museum Frankfurt, by traveling 7.4 mi, 7.4 mi, and 7.3 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 $46 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 $1,186). 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 8 airlines flying from Boston to Sofia

Discover the top 8 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 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air FranceCheapest$416Average$748FlexibilityNo cancel feeOn-time77%
KLMCheapest$457Average$823FlexibilityNo cancel feeOn-time75%
British AirwaysCheapest$510Average$590FlexibilityNo cancel feeOn-time70%
Turkish AirlinesCheapest$511Average$614FlexibilityNo cancel feeOn-time77%
SWISSCheapest$554Average$804FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$578Average$840FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$610Average$888FlexibilityNo cancel feeOn-time76%
Austrian AirlinesCheapest$639Average$1,009FlexibilityNo cancel feeOn-time78%

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