$364+ 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 10/16. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SOF
Oct 7 — Oct 141
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
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 Philadelphia to Sofia
Cheapest
Best
Last-minute
One-way
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 7, 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 7, 2026.
This Expedia deal was found by Cheapflights users on 9/4. 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 9/4![British Airways logo]()
$733
This Expedia deal was found by Cheapflights users on 9/4. 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 11/103:20 pm -
2 stops40h 45m
Sun 11/152:00 pm -
2 stops31h 44m
Deal found 9/4![Multiple Airlines logo]()
$739
This Kiwi.com deal was found by Cheapflights users on 9/3. 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.
Mon 11/235:40 pm -
1 stop13h 00m
Sun 11/297:35 pm -
2 stops27h 35m
Deal found 9/3![Multiple Airlines logo]()
$747
This Air Canada deal was found by Cheapflights users on 9/4. 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.
Wed 11/113:20 pm -
2 stops14h 55m
Sun 11/156:00 am -
2 stops39h 44m
Deal found 9/4![Air Canada logo]()
$761
This United Airlines deal was found by Cheapflights users on 9/3. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/286:55 pm -
2 stops21h 20m
Tue 10/206:10 am -
1 stop16h 55m
Deal found 9/3![United Airlines logo]()
$767
This oojo deal was found by Cheapflights users on 9/2. 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 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 9/2![Lufthansa logo]()
$773
This Travelocity deal was found by Cheapflights users on 9/5. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/57:00 am -
2 stops22h 10m
Mon 10/123:40 pm -
2 stops33h 34m
Deal found 9/5![Multiple Airlines logo]()
$782
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 7, 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 7, 2026.
This United Airlines deal was found by Cheapflights users on 9/2. 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.
Mon 9/286:55 pm -
2 stops21h 20m
Tue 10/206:10 am -
1 stop16h 55m
Deal found 9/2![United Airlines logo]()
$767
This United Airlines deal was found by Cheapflights users on 9/2. 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.
Thu 10/159:34 am -
2 stops19h 36m
Fri 10/306:25 am -
2 stops45h 09m
Deal found 9/2![United Airlines logo]()
$798
Last-minute flights from Philadelphia to SofiaDiscover last-minute flight deals from Philadelphia to Sofia. Data last updated September 7, 2026 and is based on user searches.
Discover last-minute flight deals from Philadelphia to Sofia. Data last updated September 7, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 9/2. 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.
Mon 9/286:55 pm -
2 stops21h 20m
Tue 10/206:10 am -
1 stop16h 55m
Deal found 9/2![United Airlines logo]()
$767
This oojo deal was found by Cheapflights users on 9/2. 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 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 9/2![Lufthansa logo]()
$773
This Travelocity deal was found by Cheapflights users on 9/5. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/57:00 am -
2 stops22h 10m
Mon 10/123:40 pm -
2 stops33h 34m
Deal found 9/5![Multiple Airlines logo]()
$782
This oojo deal was found by Cheapflights users on 9/5. 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 10/55:40 pm -
1 stop17h 20m
Mon 10/127:00 pm -
1 stop28h 05m
Deal found 9/5![Lufthansa logo]()
$793
This United Airlines deal was found by Cheapflights users on 9/2. 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.
Thu 10/159:34 am -
2 stops19h 36m
Fri 10/306:25 am -
2 stops45h 09m
Deal found 9/2![United Airlines logo]()
$798
One-way flights from Philadelphia to SofiaSearch for one-way flight options from Philadelphia to Sofia. Find affordable one-way fares based on user searches. Data last updated September 7, 2026.
Search for one-way flight options from Philadelphia to Sofia. Find affordable one-way fares based on user searches. Data last updated September 7, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/3. 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.
Fri 10/167:15 am -
3 stops46h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Multiple Airlines logo]()
$364
This lol.travel deal was found by Cheapflights users on 9/7. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/163:20 pm -
2 stops24h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Multiple Airlines logo]()
$501
This Booking.com deal was found by Cheapflights users on 9/3. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/165:40 pm -
1 stop12h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Lufthansa logo]()
$525
This Trip.com deal was found by Cheapflights users on 9/7. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/161:16 pm -
3 stops40h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![SWISS logo]()
$735
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 7, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $684 (Expedia) |
One-way from | $364 (Kiwi.com) |
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 7, 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
Fri 10/16
7:15 am-12:45 pm
3 stops46h 30m
Sofia
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$364
PhiladelphiaSofia
PHL Philadelphia - SOF Sofia
PHLSOF
Philadelphia
Mon 11/16
3:20 pm-10:55 pm
2 stops24h 35m
Sofia
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$501
Quickest round-trip
PhiladelphiaSofia
PHL Philadelphia - SOF Sofia
PHLSOF
Philadelphia
Fri 10/16
5:40 pm-1:15 pm
1 stop12h 35m
Sofia
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$525
PhiladelphiaSofia
PHL Philadelphia - SOF Sofia
PHLSOF
Philadelphia
Mon 11/16
1:16 pm-1:15 pm
3 stops40h 59m
Sofia
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$735
PhiladelphiaSofia
PHL Philadelphia - SOF Sofia
PHLSOF
Philadelphia
Mon 9/28
6:55 pm-11:15 pm
2 stops21h 20m
Sofia
Tue 10/20
6:10 am-4:05 pm
1 stop16h 55m
$767
PhiladelphiaSofia
PHL Philadelphia - SOF Sofia
PHLSOF
Philadelphia
Thu 10/15
9:34 am-12:10 pm
2 stops19h 36m
Sofia
Fri 10/30
6:25 am-9:34 pm
2 stops45h 09m
$798
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 $737 and $801 in November.The cheapest round-trip price found within the last 5 days was $733 on British Airways (Nov 10-Nov 15).
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 7, 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.
Food
6.6
Entertainment
7.1
Crew
8.1
Comfort
7.3
Boarding
7.7
Overall
7.4
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Food
6.6
Entertainment
7.1
Crew
8.1
Comfort
7.3
Boarding
7.7
Overall
7.4
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Food
6.6
Entertainment
7.1
Crew
8.1
Comfort
7.3
Boarding
7.7
Overall
7.4
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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Philadelphia and Sofia flights
Browse other Philadelphia and Sofia flight options. Last updated on September 7, 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 7, 2026.
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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 7, 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 7, 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% |