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Sofia

$375+ 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 4/15. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SOF
May 3 — May 101
Sun 5/3
Sun 5/10
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 3, 2026.

This United Airlines deal was found by Cheapflights users on 4/1. 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 10/278:00 pm
PHL
-
SOF
2 stops20h 45m
United Airlines
Wed 11/116:10 am
SOF
-
PHL
2 stops23h 36m
United Airlines
Deal found 4/1$714
This Orbitz deal was found by Cheapflights users on 4/1. 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.
Tue 10/276:40 pm
PHL
-
SOF
1 stop17h 35m
Multiple Airlines
Wed 11/112:00 pm
SOF
-
PHL
2 stops31h 47m
Multiple Airlines
Deal found 4/1$718
This Booking.com deal was found by Cheapflights users on 4/1. 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.
Tue 10/276:40 pm
PHL
-
SOF
1 stop13h 05m
Lufthansa
Wed 11/117:05 pm
SOF
-
PHL
1 stop28h 00m
Lufthansa
Deal found 4/1$729
This United Airlines deal was found by Cheapflights users on 4/1. 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 12/74:56 pm
PHL
-
SOF
2 stops22h 49m
United Airlines
Thu 12/106:10 am
SOF
-
PHL
1 stop16h 55m
United Airlines
Deal found 4/1$741
This Air Canada deal was found by Cheapflights users on 3/30. 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 11/93:30 pm
PHL
-
SOF
2 stops19h 50m
Air Canada
Fri 11/136:10 am
SOF
-
PHL
2 stops15h 37m
Air Canada
Deal found 3/30$743
This oojo deal was found by Cheapflights users on 4/2. 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.
Wed 9/91:55 pm
PHL
-
SOF
2 stops40h 30m
British Airways
Wed 9/169:25 pm
SOF
-
PHL
1 stop26h 15m
British Airways
Deal found 4/2$766
This United Airlines deal was found by Cheapflights users on 3/31. 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 9/57:55 pm
PHL
-
SOF
2 stops33h 15m
United Airlines
Sat 10/36:20 am
SOF
-
PHL
2 stops25h 17m
United Airlines
Deal found 3/31$807

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 3, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$766
(oojo)

One-way from

$375
(Kiwi.com)

Popular in

January

Cheapest in

November

Average price

$764
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
One-way flight from Philadelphia to Sofia
Search Deals
Highest demand for flights based on searches. 56% potential increase in price ($1,695 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 68% 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 3, 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

Sat 9/5

7:55 pm-12:10 pm

2 stops33h 15m

Sofia

Sat 10/3

6:20 am-12:37 am

2 stops25h 17m

$807

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sat 5/9

4:20 pm-1:35 pm

2 stops38h 15m

Sofia

Sun 5/17

6:20 am-9:44 pm

2 stops22h 24m

$822

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sun 5/3

7:45 pm-1:25 pm

2 stops34h 40m

Sofia

Mon 5/18

6:20 am-12:20 pm

2 stops37h 00m

$825

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sun 5/3

5:55 pm-7:20 pm

2 stops18h 25m

Sofia

Mon 5/18

8:10 pm-4:35 pm

1 stop27h 25m

$834

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sat 8/1

3:25 pm-11:00 am

2 stops36h 35m

Sofia

Sat 8/15

6:20 am-9:46 am

2 stops34h 26m

$871

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 5/26

10:32 am-11:15 pm

2 stops29h 43m

Sofia

Fri 8/28

2:10 pm-7:19 pm

2 stops36h 09m

$916

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 6/22

1:31 pm-10:40 pm

2 stops26h 09m

Sofia

Fri 9/4

6:20 am-9:43 am

2 stops34h 23m

$931
Quickest round-trip

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 8/4

12:02 pm-2:00 pm

2 stops18h 58m

Sofia

Thu 8/20

7:00 am-5:14 pm

2 stops17h 14m

$937

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Thu 4/16

10:33 am-6:40 pm

2 stops25h 07m

Sofia

Fri 5/1

6:20 am-4:05 pm

1 stop16h 45m

$955

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 5/25

3:10 pm-11:15 pm

2 stops25h 05m

Sofia

Sat 8/29

6:20 am-7:19 pm

2 stops19h 59m

$976

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/29

Showing 1-10 of 15 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, October is the cheapest month in which you can book a flight from Philadelphia to Sofia (average of $223). Flying from Philadelphia to Sofia in May is currently the most expensive (average of $532). 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 3, 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
9,538 reviews

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,538 reviews
United Airlines
7.4
Good
9,538 reviews

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Lufthansa
6.8
Okay
7,885 reviews
United Airlines
7.4
Good
9,538 reviews

Boarding

7.7

Food

6.6

Overall

7.4

Comfort

7.3

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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 18h 25m. United Airlines provides one of the quickest options available for as low as $834. 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, October is the cheapest month in which you can book a flight from Philadelphia to Sofia (average of $223). Flying from Philadelphia to Sofia in May is currently the most expensive (average of $532). 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 3, 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$511Average$763FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$540Average$700FlexibilityNo cancel feeOn-time69%

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