$340+ 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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SOF
May 18 — May 251
Round-trip
1 adult, Economy
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Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Best
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Cheapest flights from Boston to SofiaExplore 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 April 18, 2026.
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 April 18, 2026.
This Justfly.com deal was found by Cheapflights users on 4/15. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/279:50 pm
BOS
- SOF
1 stop15h 25m
Turkish Airlines
Tue 5/123:50 pm
SOF
- BOS
1 stop35h 05m
Turkish Airlines
Deal found 4/15![Turkish Airlines logo]()
$520
This FlightHub deal was found by Cheapflights users on 4/15. 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 9/159:50 pm
BOS
- SOF
1 stop34h 10m
Turkish Airlines
Wed 9/303:50 pm
SOF
- BOS
1 stop35h 05m
Turkish Airlines
Deal found 4/15![Turkish Airlines logo]()
$533
This FlightHub deal was found by Cheapflights users on 4/13. 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.
Wed 10/149:50 pm
BOS
- SOF
1 stop27h 55m
Turkish Airlines
Wed 10/289:40 pm
SOF
- BOS
1 stop27h 25m
Turkish Airlines
Deal found 4/13![Turkish Airlines logo]()
$536
This FlightHub deal was found by Cheapflights users on 4/15. 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 10/139:50 pm
BOS
- SOF
1 stop27h 55m
Turkish Airlines
Tue 10/274:00 pm
SOF
- BOS
1 stop33h 05m
Turkish Airlines
Deal found 4/15![Turkish Airlines logo]()
$537
This FlightHub deal was found by Cheapflights users on 4/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/88:00 pm
BOS
- SOF
1 stop12h 10m
Turkish Airlines
Thu 11/199:40 pm
SOF
- BOS
1 stop27h 25m
Turkish Airlines
Deal found 4/16![Turkish Airlines logo]()
$546
This FlightHub deal was found by Cheapflights users on 4/14. 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 10/59:50 pm
BOS
- SOF
1 stop27h 55m
Turkish Airlines
Mon 10/193:50 pm
SOF
- BOS
1 stop35h 05m
Turkish Airlines
Deal found 4/14![Turkish Airlines logo]()
$574
This FlightHub deal was found by Cheapflights users on 4/14. 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.
Sun 11/88:00 pm
BOS
- SOF
1 stop12h 10m
Turkish Airlines
Tue 11/2410:05 am
SOF
- BOS
1 stop15h 00m
Turkish Airlines
Deal found 4/14![Turkish Airlines logo]()
$576
This Kiwi.com deal was found by Cheapflights users on 4/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/119:50 pm
BOS
- SOF
1 stop15h 25m
Turkish Airlines
Tue 10/2710:05 am
SOF
- BOS
1 stop15h 00m
Turkish Airlines
Deal found 4/17![Turkish Airlines logo]()
$578
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 10/411:50 pm
BOS
- SOF
1 stop18h 45m
Multiple Airlines
Wed 10/216:45 pm
SOF
- BOS
1 stop33h 30m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$579
This FlightHub deal was found by Cheapflights users on 4/14. 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 9/159:50 pm
BOS
- SOF
1 stop34h 10m
Turkish Airlines
Tue 9/299:35 am
SOF
- BOS
1 stop17h 20m
Turkish Airlines
Deal found 4/14![Turkish Airlines logo]()
$583
Best flights from Boston to SofiaDiscover carefully curated flight deals from Boston to Sofia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 18, 2026.
Discover carefully curated flight deals from Boston to Sofia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 18, 2026.
This KLM deal was found by Cheapflights users on 4/17. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/276:55 pm
BOS
- SOF
1 stop12h 05m
KLM
Tue 5/127:00 am
SOF
- BOS
1 stop13h 16m
KLM
Deal found 4/17![KLM logo]()
$686
This United Airlines deal was found by Cheapflights users on 4/14. 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 8/55:45 am
BOS
- SOF
2 stops24h 40m
United Airlines
Wed 8/266:10 am
SOF
- BOS
2 stops24h 44m
United Airlines
Deal found 4/14![United Airlines logo]()
$737
This Turkish Airlines deal was found by Cheapflights users on 4/15. 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.
Fri 7/39:50 pm
BOS
- SOF
1 stop15h 25m
Turkish Airlines
Wed 7/159:35 am
SOF
- BOS
1 stop17h 20m
Turkish Airlines
Deal found 4/15![Turkish Airlines logo]()
$891
This United Airlines deal was found by Cheapflights users on 4/17. 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.
Mon 4/278:05 pm
BOS
- SOF
1 stop20h 10m
United Airlines
Tue 5/122:10 pm
SOF
- BOS
2 stops35h 01m
United Airlines
Deal found 4/17![United Airlines logo]()
$740
This KLM deal was found by Cheapflights users on 4/17. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/74:40 pm
BOS
- SOF
1 stop14h 20m
KLM
Tue 8/257:00 am
SOF
- BOS
1 stop16h 37m
KLM
Deal found 4/17![KLM logo]()
$828
This United Airlines deal was found by Cheapflights users on 4/14. 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.
Thu 4/307:27 pm
BOS
- SOF
2 stops20h 48m
United Airlines
Sun 5/108:00 am
SOF
- BOS
2 stops18h 04m
United Airlines
Deal found 4/14![United Airlines logo]()
$798
This Turkish Airlines deal was found by Cheapflights users on 4/16. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/39:50 pm
BOS
- SOF
1 stop15h 25m
Turkish Airlines
Thu 7/169:35 am
SOF
- BOS
1 stop17h 20m
Turkish Airlines
Deal found 4/16![Turkish Airlines logo]()
$937
This United Airlines deal was found by Cheapflights users on 4/14. 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.
Mon 7/132:15 pm
BOS
- SOF
2 stops14h 55m
United Airlines
Fri 8/76:10 am
SOF
- BOS
2 stops20h 45m
United Airlines
Deal found 4/14![United Airlines logo]()
$863
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Wed 8/192:19 pm
BOS
- SOF
2 stops14h 51m
United Airlines
Sun 9/68:00 am
SOF
- BOS
2 stops16h 55m
United Airlines
Deal found 4/16![United Airlines logo]()
$865
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Mon 8/37:19 am
BOS
- SOF
2 stops21h 21m
United Airlines
Thu 8/1312:55 pm
SOF
- BOS
2 stops14h 00m
United Airlines
Deal found 4/16![United Airlines logo]()
$870
This United Airlines deal was found by Cheapflights users on 4/14. 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.
Mon 7/132:15 pm
BOS
- SOF
2 stops14h 55m
United Airlines
Sat 8/812:55 pm
SOF
- BOS
1 stop11h 45m
United Airlines
Deal found 4/14![United Airlines logo]()
$914
This United Airlines deal was found by Cheapflights users on 4/14. 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.
Sat 7/49:40 pm
BOS
- SOF
2 stops14h 00m
United Airlines
Sat 9/58:00 am
SOF
- BOS
2 stops18h 19m
United Airlines
Deal found 4/14![United Airlines logo]()
$970
Last-minute flights from Boston to SofiaDiscover last-minute flight deals from Boston to Sofia. Data last updated April 18, 2026 and is based on user searches.
Discover last-minute flight deals from Boston to Sofia. Data last updated April 18, 2026 and is based on user searches.
This Air France deal was found by Cheapflights users on 4/15. 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.
Sun 4/267:05 pm
BOS
- SOF
1 stop11h 55m
Multiple Airlines
Sun 5/37:00 am
SOF
- BOS
1 stop16h 25m
Multiple Airlines
Deal found 4/15![Multiple Airlines logo]()
$667
This Justfly.com deal was found by Cheapflights users on 4/15. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/279:50 pm
BOS
- SOF
1 stop15h 25m
Turkish Airlines
Tue 5/123:50 pm
SOF
- BOS
1 stop35h 05m
Turkish Airlines
Deal found 4/15![Turkish Airlines logo]()
$520
This Air France deal was found by Cheapflights users on 4/16. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/271:30 pm
BOS
- SOF
2 stops17h 30m
Multiple Airlines
Tue 5/127:00 am
SOF
- BOS
1 stop16h 25m
Multiple Airlines
Deal found 4/16![Multiple Airlines logo]()
$622
This KLM deal was found by Cheapflights users on 4/15. 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.
Mon 4/276:55 pm
BOS
- SOF
1 stop12h 05m
KLM
Tue 5/127:00 am
SOF
- BOS
1 stop16h 25m
KLM
Deal found 4/15![KLM logo]()
$685
This Air France deal was found by Cheapflights users on 4/13. 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.
Tue 5/55:10 pm
BOS
- SOF
1 stop13h 50m
Multiple Airlines
Tue 5/197:00 am
SOF
- BOS
1 stop13h 10m
Multiple Airlines
Deal found 4/13![Multiple Airlines logo]()
$647
This Air France deal was found by Cheapflights users on 4/14. 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.
Wed 5/65:10 pm
BOS
- SOF
1 stop13h 50m
Multiple Airlines
Wed 5/207:00 am
SOF
- BOS
2 stops16h 00m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$658
This KLM deal was found by Cheapflights users on 4/17. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/114:35 pm
BOS
- SOF
1 stop14h 25m
KLM
Wed 5/207:00 am
SOF
- BOS
1 stop13h 10m
KLM
Deal found 4/17![KLM logo]()
$660
One-way flights from Boston to SofiaSearch for one-way flight options from Boston to Sofia. Find affordable one-way fares based on user searches. Data last updated April 18, 2026.
Search for one-way flight options from Boston to Sofia. Find affordable one-way fares based on user searches. Data last updated April 18, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/258:50 pm
BOS
- SOF
3 stops20h 15m
Multiple Airlines
Deal found 4/16![Multiple Airlines logo]()
$340
This Kiwi.com deal was found by Cheapflights users on 4/14. 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 6/1411:45 pm
BOS
- SOF
2 stops52h 25m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$365
This Kiwi.com deal was found by Cheapflights users on 4/13. 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.
Mon 5/1811:00 pm
BOS
- SOF
2 stops53h 50m
Multiple Airlines
Deal found 4/13![Multiple Airlines logo]()
$380
This Air France deal was found by Cheapflights users on 4/16. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/215:10 pm
BOS
- SOF
1 stop13h 50m
Air France
Deal found 4/16![Air France logo]()
$388
This United Airlines deal was found by Cheapflights users on 4/16. 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.
Tue 7/212:15 pm
BOS
- SOF
2 stops14h 55m
United Airlines
Deal found 4/16![United Airlines logo]()
$397
This Mytrip deal was found by Cheapflights users on 4/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/255:20 pm
BOS
- SOF
1 stop12h 35m
SWISS
Deal found 4/16![SWISS logo]()
$410
This Kiwi.com deal was found by Cheapflights users on 4/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/219:40 pm
BOS
- SOF
3 stops42h 30m
Multiple Airlines
Deal found 4/16![Multiple Airlines logo]()
$422
This Mytrip deal was found by Cheapflights users on 4/13. 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 5/195:10 am
BOS
- SOF
2 stops35h 00m
Multiple Airlines
Deal found 4/13![Multiple Airlines logo]()
$440
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 April 18, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $520 (Justfly.com) |
One-way from | $340 (Kiwi.com) |
Popular in | May |
Cheapest in | February |
Average price | $608 |
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 April 18, 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
Cheapest round-trip
Quickest round-trip
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Mon 4/27
6:55 pm-2:00 pm
1 stop12h 05m
Sofia
Tue 5/12
7:00 am-1:16 pm
1 stop13h 16m
$686
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Wed 8/5
5:45 am-1:25 pm
2 stops24h 40m
Sofia
Wed 8/26
6:10 am-11:54 pm
2 stops24h 44m
$737
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Mon 4/27
8:05 pm-11:15 pm
1 stop20h 10m
Sofia
Tue 5/12
2:10 pm-6:11 pm
2 stops35h 01m
$740
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Thu 4/30
7:27 pm-11:15 pm
2 stops20h 48m
Sofia
Sun 5/10
8:00 am-7:04 pm
2 stops18h 04m
$798
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Tue 7/7
4:40 pm-2:00 pm
1 stop14h 20m
Sofia
Tue 8/25
7:00 am-4:37 pm
1 stop16h 37m
$828
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Mon 7/13
2:15 pm-12:10 pm
2 stops14h 55m
Sofia
Fri 8/7
6:10 am-7:55 pm
2 stops20h 45m
$863
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Wed 8/19
2:19 pm-12:10 pm
2 stops14h 51m
Sofia
Sun 9/6
8:00 am-5:55 pm
2 stops16h 55m
$865
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Mon 8/3
7:19 am-11:40 am
2 stops21h 21m
Sofia
Thu 8/13
12:55 pm-7:55 pm
2 stops14h 00m
$870
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Fri 7/3
9:50 pm-8:15 pm
1 stop15h 25m
Sofia
Wed 7/15
9:35 am-7:55 pm
1 stop17h 20m
$891
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Mon 7/13
2:15 pm-12:10 pm
2 stops14h 55m
Sofia
Sat 8/8
12:55 pm-5:40 pm
1 stop11h 45m
$914
Showing 1-10 of 20 resultsSorted by cheapest first
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 April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Boston-Sofia flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boston-Sofia flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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.
BOS-SOF
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 April 10, 2026.
The best time to book flights from Boston to Sofia is 70 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 $883). 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 April 18, 2026.
Peruse reviews from past customers who have flown with KLM,Air France, 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.
Overall
7.8
Crew
8.4
Comfort
7.7
Food
7.3
Boarding
7.8
Entertainment
7.1
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2026
EZE - SCL
Overall
7.8
Crew
8.4
Comfort
7.7
Food
7.3
Boarding
7.8
Entertainment
7.1
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2026
EZE - SCL
Overall
7.8
Crew
8.4
Comfort
7.7
Food
7.3
Boarding
7.8
Entertainment
7.1
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2026
EZE - SCL
Overall
7.8
Crew
8.4
Comfort
7.7
Food
7.3
Boarding
7.8
Entertainment
7.1
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2026
EZE - SCL
Overall
7.8
Crew
8.4
Comfort
7.7
Food
7.3
Boarding
7.8
Entertainment
7.1
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2026
EZE - SCL
Overall
7.8
Crew
8.4
Comfort
7.7
Food
7.3
Boarding
7.8
Entertainment
7.1
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2026
EZE - SCL
Related info for your journey
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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 April 18, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$380 | Average$489 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$388 | Average$554 | FlexibilityNo cancel fee | On-time79% | |
| Cheapest$394 | Average$622 | FlexibilityNo cancel fee | On-time78% | |
| Cheapest$396 | Average$495 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$415 | Average$698 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$418 | Average$699 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$478 | Average$540 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$505 | Average$903 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$524 | Average$685 | FlexibilityNo cancel fee | On-time77% |