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$298+ 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 7/17. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SOF
jul. 8 — jul. 151
mar. 7/8
mar. 7/15
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 julio 3, 2025.

Round-trip from

$483
(Kiwi.com)

One-way from

$298
(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 julio 3, 2025.

This Kiwi.com deal was found by Cheapflights users on 7/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 7/258:05 pmBOS - SOF
1 stop19h 55mLufthansa
mar. 8/57:25 pmSOF - BOS
1 stop29h 15mLufthansa
Deal found 7/3$483
This Mytrip deal was found by Cheapflights users on 7/3. 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.
vie. 8/226:00 amBOS - SOF
2 stops22h 15mMultiple Airlines
vie. 9/512:00 pmSOF - BOS
1 stop15h 10mMultiple Airlines
Deal found 7/3$485
This United Airlines deal was found by Cheapflights users on 7/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 7/288:05 pmBOS - SOF
1 stop19h 55mUnited Airlines
sáb. 8/306:15 amSOF - BOS
2 stops42h 45mUnited Airlines
Deal found 7/2$486
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/256:00 amBOS - SOF
2 stops23h 00mAir Canada
lun. 9/156:00 amSOF - BOS
2 stops34h 55mAir Canada
Deal found 6/30$491
This Austrian Airlines 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/285:10 pmBOS - SOF
1 stop11h 30mAustrian Airlines
mié. 9/178:00 amSOF - BOS
1 stop12h 50mAustrian Airlines
Deal found 6/30$508
This Gurufare 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/16:28 pmBOS - SOF
2 stops39h 52mBritish Airways
sáb. 11/1512:05 pmSOF - BOS
1 stop16h 50mBritish Airways
Deal found 7/1$525
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.
lun. 7/218:59 pmBOS - SOF
2 stops32h 06mITA Airways
lun. 8/2512:55 pmSOF - BOS
1 stop31h 45mITA Airways
Deal found 7/1$545

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 julio 3, 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. 7/25

8:05 pm-11:00 pm

1 stop19h 55m

Sofia

mar. 8/5

7:25 pm-5:40 pm

1 stop29h 15m

$483

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

vie. 8/22

6:00 am-11:15 am

2 stops22h 15m

Sofia

vie. 9/5

12:00 pm-8:10 pm

1 stop15h 10m

$485

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

lun. 7/28

8:05 pm-11:00 pm

1 stop19h 55m

Sofia

sáb. 8/30

6:15 am-6:00 pm

2 stops42h 45m

$486

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

lun. 8/25

6:00 am-12:00 pm

2 stops23h 00m

Sofia

lun. 9/15

6:00 am-9:55 am

2 stops34h 55m

$491

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

jue. 8/28

5:10 pm-11:40 am

1 stop11h 30m

Sofia

mié. 9/17

8:00 am-1:50 pm

1 stop12h 50m

$508

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

sáb. 11/1

6:28 pm-4:20 pm

2 stops39h 52m

Sofia

sáb. 11/15

12:05 pm-9:55 pm

1 stop16h 50m

$525

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

lun. 7/21

8:59 pm-12:05 pm

2 stops32h 06m

Sofia

lun. 8/25

12:55 pm-1:40 pm

1 stop31h 45m

$545

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

jue. 7/17

10:25 pm-2:40 pm

3 stops57h 15m

$298

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

mar. 11/4

2:21 pm-6:20 pm

2 stops20h 59m

$361

BostonSofia

BOS - SOF

BOSSOF

Boston Logan Intl

mar. 7/22

6:55 pm-2:00 pm

1 stop12h 05m

$373

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 15 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 $1,189). 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 julio 3, 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 julio 3, 2025.
Peruse reviews from past customers who have flown with Austrian Airlines, Air France, and SWISS 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
809 reviews

Comfort

7.3

Food

6.8

Overall

7.6

Crew

8.1

Entertainment

6.8

Boarding

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
809 reviews
Austrian Airlines
7.6
Good
809 reviews

Comfort

7.3

Food

6.8

Overall

7.6

Crew

8.1

Entertainment

6.8

Boarding

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
1,465 reviews
Austrian Airlines
7.6
Good
809 reviews

Comfort

7.3

Food

6.8

Overall

7.6

Crew

8.1

Entertainment

6.8

Boarding

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
SWISS
7.5
Good
1,654 reviews
Austrian Airlines
7.6
Good
809 reviews

Comfort

7.3

Food

6.8

Overall

7.6

Crew

8.1

Entertainment

6.8

Boarding

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
8,861 reviews
Austrian Airlines
7.6
Good
809 reviews

Comfort

7.3

Food

6.8

Overall

7.6

Crew

8.1

Entertainment

6.8

Boarding

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
3,895 reviews
Austrian Airlines
7.6
Good
809 reviews

Comfort

7.3

Food

6.8

Overall

7.6

Crew

8.1

Entertainment

6.8

Boarding

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?

    Lufthansa, at $483, was found to be the cheapest airline from Boston to Sofia.Alternate airlines to your destination round-trip include United Airlines and Air Canada. Lufthansa is 42% 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 $361 on United Airlines. Other airlines that offer cheap prices include Air France from $373 and SWISS from $379 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 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 $44 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 $1,189). 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 julio 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air FranceCheapest$416Average$733FlexibilityNo cancel feeOn-time77%
KLMCheapest$457Average$825FlexibilityNo cancel feeOn-time75%
British AirwaysCheapest$510Average$595FlexibilityNo cancel feeOn-time70%
Turkish AirlinesCheapest$511Average$613FlexibilityNo cancel feeOn-time77%
SWISSCheapest$554Average$807FlexibilityNo cancel feeOn-time79%
United AirlinesCheapest$604Average$878FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$620Average$894FlexibilityNo cancel feeOn-time76%
Austrian AirlinesCheapest$639Average$1,072FlexibilityNo cancel feeOn-time78%

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