$587+ Cheap flights from Philadelphia (PHL) to Sofia (SOF)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/10. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SOF
Oct 13 — Oct 201
Round-trip
1 adult, Economy
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Find cheap flights from Philadelphia 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
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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 Philadelphia to Sofia
Cheapest
Best
Last-minute
Cheapest flights from Philadelphia to SofiaExplore the most affordable flight options available from Philadelphia to Sofia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 13, 2026.
Explore the most affordable flight options available from Philadelphia to Sofia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 13, 2026.
This Expedia deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:35 pm -
1 stop18h 35m
Sun 11/157:45 pm -
1 stop27h 30m
Deal found 9/9![British Airways logo]()
$587
This Expedia deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/169:50 pm -
2 stops39h 20m
Sun 11/227:45 pm -
1 stop27h 30m
Deal found 9/8![British Airways logo]()
$597
This United Airlines deal was found by Cheapflights users on 9/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:15 am -
2 stops25h 00m
Tue 11/37:55 am -
2 stops22h 36m
Deal found 9/12![United Airlines logo]()
$598
This Air Canada deal was found by Cheapflights users on 9/12. 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.
Mon 12/73:20 pm -
2 stops14h 55m
Wed 1/66:00 am -
2 stops39h 44m
Deal found 9/12![Air Canada logo]()
$623
This United Airlines deal was found by Cheapflights users on 9/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/96:00 am -
2 stops22h 50m
Thu 12/317:55 am -
2 stops17h 55m
Deal found 9/12![United Airlines logo]()
$632
Best flights from Philadelphia to SofiaDiscover carefully curated flight deals from Philadelphia to Sofia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 13, 2026.
Discover carefully curated flight deals from Philadelphia to Sofia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 13, 2026.
This United Airlines deal was found by Cheapflights users on 9/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:15 am -
2 stops25h 00m
Tue 11/37:55 am -
2 stops22h 36m
Deal found 9/12![United Airlines logo]()
$598
This British Airways deal was found by Cheapflights users on 9/11. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:38 pm -
2 stops18h 32m
Sun 11/157:45 pm -
2 stops32h 15m
Deal found 9/11![British Airways logo]()
$620
This United deal was found by Cheapflights users on 9/9. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/317:40 pm -
2 stops35h 35m
Sat 11/76:15 pm -
2 stops35h 41m
Deal found 9/9![Multiple Airlines logo]()
$657
This Cheapflightsfares deal was found by Cheapflights users on 9/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/117:00 am -
2 stops28h 10m
Sun 10/186:55 pm -
2 stops28h 10m
Deal found 9/11![Austrian Airlines logo]()
$693
This United Airlines deal was found by Cheapflights users on 9/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/287:30 pm -
2 stops20h 45m
Tue 10/206:10 am -
1 stop16h 55m
Deal found 9/11![United Airlines logo]()
$659
This FlightHub deal was found by Cheapflights users on 9/10. 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.
Thu 10/154:20 pm -
2 stops36h 50m
Sat 10/312:10 pm -
1 stop32h 55m
Deal found 9/10![Multiple Airlines logo]()
$728
This British Airways deal was found by Cheapflights users on 9/11. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/116:45 pm -
1 stop17h 35m
Sun 10/189:05 pm -
1 stop25h 55m
Deal found 9/11![British Airways logo]()
$743
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Thu 10/155:40 pm -
1 stop17h 45m
Fri 10/307:55 am -
2 stops21h 15m
Deal found 9/10![United Airlines logo]()
$695
This United Airlines deal was found by Cheapflights users on 9/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/126:00 am -
2 stops22h 50m
Thu 12/317:55 am -
2 stops17h 55m
Deal found 9/12![United Airlines logo]()
$707
Last-minute flights from Philadelphia to SofiaDiscover last-minute flight deals from Philadelphia to Sofia. Data last updated September 13, 2026 and is based on user searches.
Discover last-minute flight deals from Philadelphia to Sofia. Data last updated September 13, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 9/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/287:30 pm -
2 stops20h 45m
Tue 10/206:10 am -
1 stop16h 55m
Deal found 9/11![United Airlines logo]()
$659
This oojo deal was found by Cheapflights users on 9/10. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/285:40 pm -
1 stop17h 20m
Tue 10/206:10 am -
1 stop16h 55m
Deal found 9/10![Lufthansa logo]()
$663
This United Airlines deal was found by Cheapflights users on 9/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/114:20 pm -
2 stops36h 50m
Sun 10/186:20 am -
2 stops34h 49m
Deal found 9/12![United Airlines logo]()
$692
This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/117:00 am -
2 stops28h 10m
Sun 10/186:55 pm -
2 stops28h 10m
Deal found 9/10![Austrian Airlines logo]()
$693
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Thu 10/159:34 am -
2 stops19h 36m
Fri 10/307:55 am -
2 stops21h 15m
Deal found 9/10![United Airlines logo]()
$678
This United Airlines deal was found by Cheapflights users on 9/12. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:15 am -
2 stops25h 00m
Tue 11/37:55 am -
2 stops22h 36m
Deal found 9/12![United Airlines logo]()
$598
This oojo deal was found by Cheapflights users on 9/12. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:40 pm -
1 stop12h 45m
Tue 11/36:25 am -
1 stop16h 40m
Deal found 9/12![Lufthansa logo]()
$606
This United deal was found by Cheapflights users on 9/9. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/317:40 pm -
2 stops35h 35m
Sat 11/76:15 pm -
2 stops35h 41m
Deal found 9/9![Multiple Airlines logo]()
$657
Find flight deals from Philadelphia to Sofia
Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) 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 September 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $561 (British Airways) |
Popular in | January |
Cheapest in | November |
Average price | $786 |
Cheapflights Fare Finder
Customize your flight search to find flights from Philadelphia 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 7,457,451 searches. Data last updated September 13, 2026.
Use the filters below to find and compare flights from Philadelphia to Sofia that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
PhiladelphiaSofia
PHL Philadelphia - SOF Sofia
PHLSOF
Philadelphia
Tue 10/27
6:15 am-1:15 pm
2 stops25h 00m
Sofia
Tue 11/3
7:55 am-11:31 pm
2 stops22h 36m
$598
PhiladelphiaSofia
PHL Philadelphia - SOF Sofia
PHLSOF
Philadelphia
Tue 11/10
6:38 pm-8:10 pm
2 stops18h 32m
Sofia
Sun 11/15
7:45 pm-9:00 pm
2 stops32h 15m
$620
PhiladelphiaSofia
PHL Philadelphia - SOF Sofia
PHLSOF
Philadelphia
Sat 10/31
7:40 pm-1:15 pm
2 stops35h 35m
Sofia
Sat 11/7
6:15 pm-10:56 pm
2 stops35h 41m
$657
Quickest round-trip
PhiladelphiaSofia
PHL Philadelphia - SOF Sofia
PHLSOF
Philadelphia
Mon 9/28
7:30 pm-11:15 pm
2 stops20h 45m
Sofia
Tue 10/20
6:10 am-4:05 pm
1 stop16h 55m
$659
PhiladelphiaSofia
PHL Philadelphia - SOF Sofia
PHLSOF
Philadelphia
Sun 10/11
7:00 am-6:10 pm
2 stops28h 10m
Sofia
Sun 10/18
6:55 pm-4:05 pm
2 stops28h 10m
$693
PhiladelphiaSofia
PHL Philadelphia - SOF Sofia
PHLSOF
Philadelphia
Thu 10/15
5:40 pm-6:25 pm
1 stop17h 45m
Sofia
Fri 10/30
7:55 am-11:10 pm
2 stops21h 15m
$695
PhiladelphiaSofia
PHL Philadelphia - SOF Sofia
PHLSOF
Philadelphia
Sat 12/12
6:00 am-11:50 am
2 stops22h 50m
Sofia
Thu 12/31
7:55 am-6:50 pm
2 stops17h 55m
$707
PhiladelphiaSofia
PHL Philadelphia - SOF Sofia
PHLSOF
Philadelphia
Thu 10/15
4:20 pm-12:10 pm
2 stops36h 50m
Sofia
Sat 10/31
2:10 pm-5:05 pm
1 stop32h 55m
$728
PhiladelphiaSofia
PHL Philadelphia - SOF Sofia
PHLSOF
Philadelphia
Sun 10/11
6:45 pm-7:20 pm
1 stop17h 35m
Sofia
Sun 10/18
9:05 pm-4:00 pm
1 stop25h 55m
$743
Sorted by cheapest first
Compare providers for flights from Philadelphia 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 Philadelphia to Sofia in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Philadelphia-Sofia flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Philadelphia-Sofia flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Philadelphia-Sofia flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Philadelphia-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 Philadelphia-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 Philadelphia to Sofia
Have a flexible travel schedule? Discover the best time to fly to Sofia from Philadelphia with our price prediction graph.
PHL-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 Philadelphia to Sofia
What is the cheapest month to book a flight from Philadelphia to Sofia?
Currently, November is the cheapest month in which you can book a flight from Philadelphia to Sofia (average of $540). Flying from Philadelphia to Sofia in January is currently the most expensive (average of $7,242). 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 Philadelphia to Sofia?
Airfare is below average for this route at the moment.
Philadelphia to Sofia flights typically cost between $752 and $801 in January.The cheapest round-trip price found within the last 5 days was $561 on British Airways (Jan 5-Jan 11).
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 September 13, 2026.
Read reviews from past customers who have flown United Airlines and Lufthansa from Philadelphia to Sofia. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
7.7
Food
6.7
Crew
8.1
Entertainment
7.1
Overall
7.4
Comfort
7.3
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Boarding
7.7
Food
6.7
Crew
8.1
Entertainment
7.1
Overall
7.4
Comfort
7.3
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Boarding
7.7
Food
6.7
Crew
8.1
Entertainment
7.1
Overall
7.4
Comfort
7.3
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Related info for your journey
Find useful and relevant information for your journey from Philadelphia to Sofia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Complete your trip
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Search flights from Philadelphia to Sofia by cabin class
Find flights from Philadelphia to Sofia, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Philadelphia and Sofia flights
Browse other Philadelphia and Sofia flight options. Last updated on September 13, 2026.
Other flights from Philadelphia
Browse through other flights departing from Philadelphia. Flights are based on user searches made on Cheapflights and were last updated on September 13, 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 September 13, 2026.
Top 2 airlines flying from Philadelphia to Sofia
Discover the top 2 airlines that operate flights from Philadelphia 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 7,457,451 searches. Data last updated September 13, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$511 | Average$786 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$540 | Average$737 | FlexibilityNo cancel fee | On-time69% |