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$286+ 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 7/27. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SOF
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$564
(Air France)

One-way from

$286
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$1,151
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. 5% potential increase in price ($51 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 June 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 June 12, 2025.

This Orbitz deal was found by Cheapflights users on 6/9. 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.
Thu 9/111:00 pmBOS - SOF
2 stops17h 30mBritish Airways
Sun 9/219:10 pmSOF - BOS
2 stops24h 13mBritish Airways
Deal found 6/9$560
This Air France deal was found by Cheapflights users on 6/9. 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.
Mon 6/306:50 pmBOS - SOF
1 stop12h 10mAir France
Mon 8/47:00 amSOF - BOS
1 stop13h 40mAir France
Deal found 6/9$564
This KLM deal was found by Cheapflights users on 6/9. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/36:45 pmBOS - SOF
1 stop12h 15mMultiple Airlines
Sat 10/117:00 amSOF - BOS
1 stop20h 20mMultiple Airlines
Deal found 6/9$577
This KLM deal was found by Cheapflights users on 6/11. 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.
Fri 10/36:45 pmBOS - SOF
1 stop12h 15mKLM
Sat 10/117:00 amSOF - BOS
1 stop16h 30mKLM
Deal found 6/11$578
This Mytrip deal was found by Cheapflights users on 6/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/104:15 pmBOS - SOF
1 stop18h 50mLufthansa
Wed 12/246:15 amSOF - BOS
1 stop14h 10mLufthansa
Deal found 6/10$593
This Booking.com deal was found by Cheapflights users on 6/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/55:10 pmBOS - SOF
1 stop15h 10mAustrian Airlines
Sun 8/246:55 pmSOF - BOS
1 stop25h 55mAustrian Airlines
Deal found 6/10$608
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Tue 7/228:05 pmBOS - SOF
1 stop19h 55mUnited Airlines
Wed 8/206:15 amSOF - BOS
2 stops24h 42mUnited Airlines
Deal found 6/10$609
This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/85:05 pmBOS - SOF
1 stop12h 00mITA Airways
Mon 8/1812:55 pmSOF - BOS
1 stop31h 45mITA Airways
Deal found 6/10$620
This Air Canada deal was found by Cheapflights users on 6/12. 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.
Sat 10/256:30 pmBOS - SOF
2 stops36h 55mAir Canada
Mon 11/32:20 pmSOF - BOS
2 stops31h 18mAir Canada
Deal found 6/12$622
This Turkish Airlines deal was found by Cheapflights users on 6/10. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/299:35 pmBOS - SOF
1 stop15h 50mTurkish Airlines
Tue 10/219:15 pmSOF - BOS
1 stop29h 25mTurkish Airlines
Deal found 6/10$625

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 June 12, 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

Thu 9/11

1:00 pm-1:30 pm

2 stops17h 30m

Sofia

Sun 9/21

9:10 pm-2:23 pm

2 stops24h 13m

$560

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 6/30

6:50 pm-2:00 pm

1 stop12h 10m

Sofia

Mon 8/4

7:00 am-1:40 pm

1 stop13h 40m

$564

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Fri 10/3

6:45 pm-2:00 pm

1 stop12h 15m

Sofia

Sat 10/11

7:00 am-8:20 pm

1 stop20h 20m

$577

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Fri 10/3

6:45 pm-2:00 pm

1 stop12h 15m

Sofia

Sat 10/11

7:00 am-4:30 pm

1 stop16h 30m

$578

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sat 7/5

5:10 pm-3:20 pm

1 stop15h 10m

Sofia

Sun 8/24

6:55 pm-1:50 pm

1 stop25h 55m

$608

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 7/22

8:05 pm-11:00 pm

1 stop19h 55m

Sofia

Wed 8/20

6:15 am-11:57 pm

2 stops24h 42m

$609

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 7/8

5:05 pm-12:05 pm

1 stop12h 00m

Sofia

Mon 8/18

12:55 pm-1:40 pm

1 stop31h 45m

$620

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Sat 10/25

6:30 pm-2:25 pm

2 stops36h 55m

Sofia

Mon 11/3

2:20 pm-2:38 pm

2 stops31h 18m

$622

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Mon 9/29

9:35 pm-8:25 pm

1 stop15h 50m

Sofia

Tue 10/21

9:15 pm-7:40 pm

1 stop29h 25m

$625

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

Tue 8/12

8:05 pm-11:00 pm

1 stop19h 55m

Sofia

Tue 8/19

7:25 pm-5:40 pm

1 stop29h 15m

$656

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 17 results
1
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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 9, 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 $1,203). 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 June 12, 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 June 12, 2025.
Get a feel of what it's like to fly with KLM, Austrian Airlines and Air France from Boston to Sofia by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,358 reviews

Crew

8.4

Overall

7.8

Boarding

7.8

Comfort

7.7

Food

7.2

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
KLM
7.8
Good
1,358 reviews
KLM
7.8
Good
1,358 reviews

Crew

8.4

Overall

7.8

Boarding

7.8

Comfort

7.7

Food

7.2

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
Austrian Airlines
7.6
Good
802 reviews
KLM
7.8
Good
1,358 reviews

Crew

8.4

Overall

7.8

Boarding

7.8

Comfort

7.7

Food

7.2

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
Air France
7.5
Good
1,463 reviews
KLM
7.8
Good
1,358 reviews

Crew

8.4

Overall

7.8

Boarding

7.8

Comfort

7.7

Food

7.2

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
SWISS
7.5
Good
1,623 reviews
KLM
7.8
Good
1,358 reviews

Crew

8.4

Overall

7.8

Boarding

7.8

Comfort

7.7

Food

7.2

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
United Airlines
7.4
Good
8,790 reviews
KLM
7.8
Good
1,358 reviews

Crew

8.4

Overall

7.8

Boarding

7.8

Comfort

7.7

Food

7.2

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.

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?

    Air France, at $564, was found to be the cheapest airline from Boston to Sofia.Alternate airlines to your destination round-trip include British Airways and Austrian Airlines. Air France is 33% 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 $399 on ITA Airways. Other airlines that offer cheap prices include Air France from $433 and Air Canada from $459 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 $43 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 $1,203). 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 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air FranceCheapest$483Average$856FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$510Average$590FlexibilityNo cancel feeOn-time70%
Turkish AirlinesCheapest$512Average$599FlexibilityNo cancel feeOn-time77%
SWISSCheapest$554Average$807FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$608Average$894FlexibilityNo cancel feeOn-time69%
Austrian AirlinesCheapest$622Average$984FlexibilityNo cancel feeOn-time78%
KLMCheapest$623Average$869FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$650Average$903FlexibilityNo cancel feeOn-time76%

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