$214+ 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 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — SOF
Mar 23 — Mar 301
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Boston to Sofia with Cheapflights
1. Tell us where you want to go
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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Boston to Sofia
Cheapest
Best
Last-minute
One-way
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 February 21, 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 February 21, 2026.
This AirNGo deal was found by Cheapflights users on 2/18. 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 AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/165:30 am
BOS
- SOF
2 stops25h 45m
Multiple Airlines
Wed 11/256:00 am
SOF
- BOS
1 stop19h 35m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$367
This AirNGo deal was found by Cheapflights users on 2/18. 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 AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/166:40 pm
BOS
- SOF
2 stops12h 35m
Air Canada
Wed 11/256:00 am
SOF
- BOS
2 stops19h 42m
Air Canada
Deal found 2/18![Air Canada logo]()
$376
This Kiwi.com deal was found by Cheapflights users on 2/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/165:25 pm
BOS
- SOF
1 stop14h 00m
Lufthansa
Wed 11/256:00 am
SOF
- BOS
1 stop19h 35m
Lufthansa
Deal found 2/18![Lufthansa logo]()
$377
This Mytrip deal was found by Cheapflights users on 2/19. 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 4/146:15 am
BOS
- SOF
2 stops22h 55m
Multiple Airlines
Tue 4/2812:55 pm
SOF
- BOS
1 stop11h 45m
Multiple Airlines
Deal found 2/19![Multiple Airlines logo]()
$386
This Booking.com deal was found by Cheapflights users on 2/18. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/135:20 pm
BOS
- SOF
1 stop11h 55m
SWISS
Wed 4/2911:05 am
SOF
- BOS
1 stop15h 50m
SWISS
Deal found 2/18![SWISS logo]()
$388
This SWISS deal was found by Cheapflights users on 2/18. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/299:40 pm
BOS
- SOF
1 stop31h 35m
SWISS
Tue 4/141:05 pm
SOF
- BOS
1 stop33h 05m
SWISS
Deal found 2/18![SWISS logo]()
$390
This FlightHub deal was found by Cheapflights users on 2/18. 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.
Tue 4/78:05 pm
BOS
- SOF
1 stop19h 55m
Multiple Airlines
Tue 4/211:05 pm
SOF
- BOS
1 stop33h 05m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$391
This Gotogate deal was found by Cheapflights users on 2/18. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:15 am
BOS
- SOF
2 stops22h 55m
Multiple Airlines
Wed 4/298:00 am
SOF
- BOS
1 stop12h 50m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$395
This Air France deal was found by Cheapflights users on 2/21. 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 3/227:30 pm
BOS
- SOF
1 stop12h 25m
Air France
Tue 4/77:00 am
SOF
- BOS
1 stop13h 33m
Air France
Deal found 2/21![Air France logo]()
$398
This Kiwi.com deal was found by Cheapflights users on 2/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/229:40 pm
BOS
- SOF
1 stop19h 05m
Multiple Airlines
Sun 4/56:55 pm
SOF
- BOS
1 stop25h 55m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$400
This Mytrip deal was found by Cheapflights users on 2/18. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/293:35 pm
BOS
- SOF
2 stops19h 35m
Multiple Airlines
Tue 4/1412:25 pm
SOF
- BOS
1 stop32h 25m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$401
This Mytrip deal was found by Cheapflights users on 2/18. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/131:00 pm
BOS
- SOF
2 stops16h 10m
Multiple Airlines
Mon 4/277:25 pm
SOF
- BOS
1 stop29h 15m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$402
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 February 21, 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 February 21, 2026.
This SWISS deal was found by Cheapflights users on 2/19. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/149:40 pm
BOS
- SOF
1 stop29h 40m
SWISS
Tue 4/281:05 pm
SOF
- BOS
1 stop33h 05m
SWISS
Deal found 2/19![SWISS logo]()
$390
This United Airlines deal was found by Cheapflights users on 2/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/78:05 pm
BOS
- SOF
1 stop19h 55m
United Airlines
Tue 4/218:00 am
SOF
- BOS
2 stops17h 19m
United Airlines
Deal found 2/18![United Airlines logo]()
$405
This KLM deal was found by Cheapflights users on 2/18. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/77:00 pm
BOS
- SOF
1 stop12h 00m
Multiple Airlines
Tue 8/257:00 am
SOF
- BOS
1 stop19h 35m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$435
This KLM deal was found by Cheapflights users on 2/21. 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.
Sun 8/164:45 pm
BOS
- SOF
1 stop14h 15m
KLM
Sun 9/67:00 am
SOF
- BOS
1 stop13h 19m
KLM
Deal found 2/21![KLM logo]()
$495
This KLM deal was found by Cheapflights users on 2/20. 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 8/111:10 pm
BOS
- SOF
2 stops17h 50m
Multiple Airlines
Tue 8/187:00 am
SOF
- BOS
1 stop19h 35m
Multiple Airlines
Deal found 2/20![Multiple Airlines logo]()
$440
This United Airlines deal was found by Cheapflights users on 2/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/46:40 pm
BOS
- SOF
2 stops40h 30m
United Airlines
Mon 4/138:00 am
SOF
- BOS
1 stop12h 50m
United Airlines
Deal found 2/18![United Airlines logo]()
$471
This United Airlines deal was found by Cheapflights users on 2/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/310:40 am
BOS
- SOF
2 stops28h 50m
United Airlines
Tue 4/78:00 am
SOF
- BOS
2 stops22h 59m
United Airlines
Deal found 2/18![United Airlines logo]()
$481
This United Airlines deal was found by Cheapflights users on 2/19. 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 4/116:40 pm
BOS
- SOF
2 stops40h 30m
United Airlines
Sat 4/2512:55 pm
SOF
- BOS
2 stops52h 01m
United Airlines
Deal found 2/19![United Airlines logo]()
$492
Last-minute flights from Boston to SofiaDiscover last-minute flight deals from Boston to Sofia. Data last updated February 21, 2026 and is based on user searches.
Discover last-minute flight deals from Boston to Sofia. Data last updated February 21, 2026 and is based on user searches.
This AirNGo deal was found by Cheapflights users on 2/18. 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 AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/165:30 am
BOS
- SOF
2 stops25h 45m
Multiple Airlines
Wed 11/256:00 am
SOF
- BOS
1 stop19h 35m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$367
This AirNGo deal was found by Cheapflights users on 2/18. 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 AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/166:40 pm
BOS
- SOF
2 stops12h 35m
Air Canada
Wed 11/256:00 am
SOF
- BOS
2 stops19h 42m
Air Canada
Deal found 2/18![Air Canada logo]()
$376
This Kiwi.com deal was found by Cheapflights users on 2/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/165:25 pm
BOS
- SOF
1 stop14h 00m
Lufthansa
Wed 11/256:00 am
SOF
- BOS
1 stop19h 35m
Lufthansa
Deal found 2/18![Lufthansa logo]()
$377
This KLM deal was found by Cheapflights users on 2/20. 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 3/178:10 pm
BOS
- SOF
1 stop11h 55m
Multiple Airlines
Tue 3/247:10 am
SOF
- BOS
1 stop13h 20m
Multiple Airlines
Deal found 2/20![Multiple Airlines logo]()
$411
This United Airlines deal was found by Cheapflights users on 2/20. 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 3/171:57 pm
BOS
- SOF
2 stops17h 18m
United Airlines
Tue 3/246:00 am
SOF
- BOS
2 stops33h 32m
United Airlines
Deal found 2/20![United Airlines logo]()
$413
This Air France deal was found by Cheapflights users on 2/21. 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 3/227:30 pm
BOS
- SOF
1 stop12h 25m
Air France
Tue 4/77:00 am
SOF
- BOS
1 stop13h 33m
Air France
Deal found 2/21![Air France logo]()
$398
This Kiwi.com deal was found by Cheapflights users on 2/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/229:40 pm
BOS
- SOF
1 stop19h 05m
Multiple Airlines
Sun 4/56:55 pm
SOF
- BOS
1 stop25h 55m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$400
This Air France deal was found by Cheapflights users on 2/21. 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 3/227:30 pm
BOS
- SOF
1 stop12h 25m
Multiple Airlines
Tue 4/77:00 am
SOF
- BOS
2 stops15h 09m
Multiple Airlines
Deal found 2/21![Multiple Airlines logo]()
$408
This United Airlines deal was found by Cheapflights users on 2/20. 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 3/2412:10 pm
BOS
- SOF
2 stops19h 05m
United Airlines
Tue 4/78:00 am
SOF
- BOS
2 stops18h 41m
United Airlines
Deal found 2/20![United Airlines logo]()
$409
This SWISS deal was found by Cheapflights users on 2/18. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/299:40 pm
BOS
- SOF
1 stop31h 35m
SWISS
Tue 4/141:05 pm
SOF
- BOS
1 stop33h 05m
SWISS
Deal found 2/18![SWISS logo]()
$390
This Mytrip deal was found by Cheapflights users on 2/18. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/293:35 pm
BOS
- SOF
2 stops19h 35m
Multiple Airlines
Tue 4/1412:25 pm
SOF
- BOS
1 stop32h 25m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$401
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 February 21, 2026.
Search for one-way flight options from Boston to Sofia. Find affordable one-way fares based on user searches. Data last updated February 21, 2026.
This Lufthansa deal was found by Cheapflights users on 2/18. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/58:05 pm
BOS
- SOF
1 stop19h 55m
Lufthansa
Deal found 2/18![Lufthansa logo]()
$214
This Mytrip deal was found by Cheapflights users on 2/18. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/48:05 pm
BOS
- SOF
1 stop19h 55m
Lufthansa
Deal found 2/18![Lufthansa logo]()
$221
This Kiwi.com deal was found by Cheapflights users on 2/21. 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 4/277:50 pm
BOS
- SOF
3 stops36h 55m
Multiple Airlines
Deal found 2/21![Multiple Airlines logo]()
$246
This Kiwi.com deal was found by Cheapflights users on 2/20. 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 5/58:50 pm
BOS
- SOF
3 stops43h 00m
Multiple Airlines
Deal found 2/20![Multiple Airlines logo]()
$254
This Orbitz deal was found by Cheapflights users on 2/18. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/510:40 am
BOS
- SOF
2 stops16h 40m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$261
This Air France deal was found by Cheapflights users on 2/19. 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 5/207:00 pm
BOS
- SOF
1 stop12h 00m
Air France
Deal found 2/19![Air France logo]()
$273
This Kiwi.com deal was found by Cheapflights users on 2/18. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/48:05 pm
BOS
- SOF
3 stops17h 35m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$286
This United Airlines deal was found by Cheapflights users on 2/20. 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 8/13:35 pm
BOS
- SOF
2 stops36h 25m
United Airlines
Deal found 2/20![United Airlines logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 2/20. 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 3/179:45 am
BOS
- SOF
3 stops51h 00m
Multiple Airlines
Deal found 2/20![Multiple Airlines logo]()
$289
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 February 21, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $367 (AirNGo) |
One-way from | $214 (Lufthansa) |
Popular in | June |
Cheapest in | February |
Average price | $461 |
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 February 21, 2026.
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
Tue 4/14
9:40 pm-10:20 am
1 stop29h 40m
Sofia
Tue 4/28
1:05 pm-3:10 pm
1 stop33h 05m
$390
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Tue 4/7
8:05 pm-11:00 pm
1 stop19h 55m
Sofia
Tue 4/21
8:00 am-6:19 pm
2 stops17h 19m
$405
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Tue 7/7
7:00 pm-2:00 pm
1 stop12h 00m
Sofia
Tue 8/25
7:00 am-7:35 pm
1 stop19h 35m
$435
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Tue 8/11
1:10 pm-2:00 pm
2 stops17h 50m
Sofia
Tue 8/18
7:00 am-7:35 pm
1 stop19h 35m
$440
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Sat 4/4
6:40 pm-6:10 pm
2 stops40h 30m
Sofia
Mon 4/13
8:00 am-1:50 pm
1 stop12h 50m
$471
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Fri 4/3
10:40 am-10:30 pm
2 stops28h 50m
Sofia
Tue 4/7
8:00 am-11:59 pm
2 stops22h 59m
$481
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Sat 4/11
6:40 pm-6:10 pm
2 stops40h 30m
Sofia
Sat 4/25
12:55 pm-9:56 am
2 stops52h 01m
$492
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Sun 8/16
4:45 pm-2:00 pm
1 stop14h 15m
Sofia
Sun 9/6
7:00 am-1:19 pm
1 stop13h 19m
$495
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Wed 8/5
8:05 pm-11:00 pm
1 stop19h 55m
$214
BostonSofia
BOS - SOF
BOSSOF
Boston Logan Intl
Tue 8/4
8:05 pm-11:00 pm
1 stop19h 55m
$221
Showing 1-10 of 17 results
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 February.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 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 February 20, 2026.
The best time to book flights from Boston to Sofia is 60 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, April is the cheapest month in which you can book a flight from Boston to Sofia (average of $380). Flying from Boston to Sofia in May is currently the most expensive (average of $593). 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.
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 February 21, 2026.
Peruse reviews from past customers who have flown with KLM, SWISS, 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.
Overall
7.7
Entertainment
7.1
Boarding
7.8
Comfort
7.6
Food
7.3
Crew
8.4
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2026
EZE - SCL
Overall
7.7
Entertainment
7.1
Boarding
7.8
Comfort
7.6
Food
7.3
Crew
8.4
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2026
EZE - SCL
Overall
7.7
Entertainment
7.1
Boarding
7.8
Comfort
7.6
Food
7.3
Crew
8.4
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2026
EZE - SCL
Overall
7.7
Entertainment
7.1
Boarding
7.8
Comfort
7.6
Food
7.3
Crew
8.4
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2026
EZE - SCL
Overall
7.7
Entertainment
7.1
Boarding
7.8
Comfort
7.6
Food
7.3
Crew
8.4
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2026
EZE - SCL
Overall
7.7
Entertainment
7.1
Boarding
7.8
Comfort
7.6
Food
7.3
Crew
8.4
Reviews
1 / 20
2.0
MediocreAnonymous,Feb 2026
EZE - SCL
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.
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
Complete your trip
Flights by cabin class
Other flight options
Other flights from Boston
Popular flights
Sofia flight routes
Alternative routes for Boston to Sofia
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Sofia by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Boston to Sofia by cabin class
Find flights from Boston to Sofia, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Boston and Sofia flights
Browse other Boston and Sofia flight options. Last updated on February 21, 2026.
Other flights from Boston
Browse through other flights departing from Boston. Flights are based on user searches made on Cheapflights and were last updated on February 21, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Sofia
Explore flights to Sofia departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on February 21, 2026.
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 February 21, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$380 | Average$487 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$394 | Average$681 | FlexibilityNo cancel fee | On-time78% | |
| Cheapest$396 | Average$494 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$410 | Average$681 | FlexibilityNo cancel fee | On-time79% | |
| Cheapest$417 | Average$699 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$428 | Average$761 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$482 | Average$540 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$505 | Average$924 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$524 | Average$697 | FlexibilityNo cancel fee | On-time77% |