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Sofia

$482+ Cheap flights from Philadelphia (PHL) 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 5/10. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SOF
May 17 — May 241
Sun 5/17
Sun 5/24
1 adult, Economy
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Cheap flight deals from Philadelphia to Sofia

Cheapest flights from Philadelphia to Sofia
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 April 17, 2026.

This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/276:55 pm
PHL
-
SOF
2 stops40h 05m
United Airlines
Wed 5/66:20 am
SOF
-
PHL
2 stops25h 39m
United Airlines
Deal found 4/13$729
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.
Sun 12/277:50 am
PHL
-
SOF
2 stops27h 30m
United Airlines
Mon 1/181:55 pm
SOF
-
PHL
2 stops39h 51m
United Airlines
Deal found 4/16$732
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.
Sun 8/210:05 am
PHL
-
SOF
2 stops25h 05m
United Airlines
Fri 10/96:20 am
SOF
-
PHL
1 stop16h 45m
United Airlines
Deal found 4/16$750
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.
Sun 8/210:05 am
PHL
-
SOF
2 stops25h 05m
United Airlines
Tue 10/136:10 am
SOF
-
PHL
2 stops22h 22m
United Airlines
Deal found 4/16$753
This United Airlines deal was found by Cheapflights users on 4/12. 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.
Fri 12/118:00 pm
PHL
-
SOF
2 stops15h 20m
United Airlines
Tue 12/156:10 am
SOF
-
PHL
1 stop16h 55m
United Airlines
Deal found 4/12$757
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/276:35 pm
PHL
-
SOF
1 stop14h 45m
British Airways
Mon 1/185:25 pm
SOF
-
PHL
1 stop29h 50m
British Airways
Deal found 4/16$766
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.
Sun 8/210:05 am
PHL
-
SOF
2 stops25h 05m
United Airlines
Mon 10/122:20 pm
SOF
-
PHL
1 stop32h 45m
United Airlines
Deal found 4/16$771
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3010:38 am
PHL
-
SOF
2 stops29h 02m
United Airlines
Wed 5/66:20 am
SOF
-
PHL
2 stops25h 39m
United Airlines
Deal found 4/13$779

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 April 17, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$729
(United Airlines)

Popular in

January

Cheapest in

November

Average price

$653
Provider with most accurate pricing for Philadelphia-Sofia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Philadelphia-Sofia flights.
Search Deals
From Philadelphia to Sofia
Search Deals
Highest demand for flights based on searches. 56% potential increase in price ($1,728 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 67% potential price decrease ($538 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

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 2,558,603 searches. Data last updated April 17, 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

Price

Cheapest round-trip

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sun 8/2

10:05 am-6:10 pm

2 stops25h 05m

Sofia

Fri 10/9

6:10 am-10:46 pm

2 stops23h 36m

$759

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Thu 9/10

10:28 am-11:15 pm

2 stops29h 47m

Sofia

Tue 9/15

2:10 pm-2:47 pm

2 stops31h 37m

$791

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Wed 9/9

1:55 pm-1:25 pm

2 stops40h 30m

Sofia

Wed 9/16

9:25 pm-4:40 pm

1 stop26h 15m

$813

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sun 8/2

10:05 am-6:10 pm

2 stops25h 05m

Sofia

Sat 10/10

6:20 am-2:47 pm

2 stops15h 27m

$813

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 4/28

5:40 pm-1:05 pm

1 stop12h 25m

Sofia

Wed 5/6

6:20 am-12:59 am

2 stops25h 39m

$820
Quickest round-trip

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Fri 9/11

1:20 pm-2:00 pm

2 stops17h 40m

Sofia

Tue 9/15

7:00 am-5:14 pm

2 stops17h 14m

$830

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Wed 4/29

5:40 pm-6:05 pm

1 stop17h 25m

Sofia

Mon 5/4

2:20 pm-12:59 am

2 stops17h 39m

$870

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Thu 4/30

5:40 pm-10:40 pm

1 stop22h 00m

Sofia

Sun 5/3

6:10 am-10:43 pm

2 stops23h 33m

$920

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 4/27

6:55 pm-6:00 pm

2 stops40h 05m

Sofia

Tue 5/5

6:10 am-4:05 pm

1 stop16h 55m

$920

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Fri 9/11

5:40 pm-10:30 pm

1 stop21h 50m

Sofia

Tue 9/15

2:10 pm-2:47 pm

2 stops31h 37m

$947

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

Showing 1-10 of 12 resultsSorted by cheapest first
1
2

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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
BudgetAirPrice Accuracy1 starTrust Score*3 stars
Trip.comPrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • 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.
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?

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 17, 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.
United Airlines
7.4
Good
9,602 reviews

Crew

8.1

Comfort

7.3

Food

6.6

Overall

7.4

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
United Airlines
7.4
Good
9,602 reviews
United Airlines
7.4
Good
9,602 reviews

Crew

8.1

Comfort

7.3

Food

6.6

Overall

7.4

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.
Lufthansa
6.8
Okay
7,926 reviews
United Airlines
7.4
Good
9,602 reviews

Crew

8.1

Comfort

7.3

Food

6.6

Overall

7.4

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Apr 2026

DFW - EWR

The flight was on time. Crew was friendly. Will fly again. The seats was comfortable.

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.

  • How long is the flight from Philadelphia to Sofia?

    A quick flight from Philadelphia to Sofia can take about 25h 05m. United Airlines provides one of the quickest options available for as low as $759. Philadelphia and Sofia are separated by a distance of 4800 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Philadelphia to Sofia round-trip?

    According to our current data, Lufthansa ($511), and United Airlines ($540) offers the cheapest pricing from Philadelphia to Sofia. These flights start at 61% lower than the current average price 3 months from now.

  • Can I find deals for flights from Philadelphia to Sofia that include hotel bookings?

    Yes. In addition to deals on Philadelphia to Sofia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Philadelphia to Sofia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Philadelphia to Sofia.

  • Can I find deals for business class flights from Philadelphia to Sofia?

    Yes. Cheapflights offers flight deals from Philadelphia to Sofia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Philadelphia to Sofia

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Sofia flights
Newark to Sofia flights
Dulles Intl to Sofia flights
Pittsburgh to Sofia flights

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 2,558,603 searches. Data last updated April 17, 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$511Average$784FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$540Average$700FlexibilityNo cancel feeOn-time69%

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