HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Sofia

$517+ 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 7/27. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SOF
Aug 1 — Aug 81
Sat 8/1
Sat 8/8
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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 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 July 2, 2026.

This Gotogate deal was found by Cheapflights users on 7/1. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/53:25 pm
PHL
-
SOF
2 stops20h 15m
Multiple Airlines
Wed 8/126:55 pm
SOF
-
PHL
2 stops28h 10m
Multiple Airlines
Deal found 7/1$735
This United Airlines deal was found by Cheapflights users on 6/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/139:30 am
PHL
-
SOF
2 stops19h 40m
United Airlines
Thu 10/16:30 am
SOF
-
PHL
1 stop16h 35m
United Airlines
Deal found 6/30$736
This Booking.com deal was found by Cheapflights users on 6/29. 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 8/175:40 pm
PHL
-
SOF
1 stop12h 45m
Lufthansa
Wed 9/26:20 am
SOF
-
PHL
1 stop16h 45m
Lufthansa
Deal found 6/29$738
This United Airlines deal was found by Cheapflights users on 6/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/610:15 am
PHL
-
SOF
2 stops19h 55m
United Airlines
Thu 12/106:25 am
SOF
-
PHL
1 stop16h 40m
United Airlines
Deal found 6/30$740
This United Airlines deal was found by Cheapflights users on 6/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/135:40 pm
PHL
-
SOF
1 stop17h 30m
United Airlines
Tue 9/296:10 am
SOF
-
PHL
1 stop16h 55m
United Airlines
Deal found 6/30$743
This Gotogate deal was found by Cheapflights users on 6/29. 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 8/177:00 am
PHL
-
SOF
2 stops22h 10m
Multiple Airlines
Wed 9/28:00 am
SOF
-
PHL
2 stops15h 05m
Multiple Airlines
Deal found 6/29$744
This United Airlines deal was found by Cheapflights users on 6/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/136:25 am
PHL
-
SOF
2 stops22h 45m
United Airlines
Wed 9/306:20 am
SOF
-
PHL
2 stops18h 34m
United Airlines
Deal found 6/30$746
This Air Canada deal was found by Cheapflights users on 7/1. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/63:20 pm
PHL
-
SOF
2 stops20h 00m
Air Canada
Thu 12/102:05 pm
SOF
-
PHL
2 stops33h 16m
Air Canada
Deal found 7/1$747
This KAYAK deal was found by Cheapflights users on 6/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1710:34 am
PHL
-
SOF
2 stops40h 46m
SWISS
Mon 8/243:40 pm
SOF
-
PHL
2 stops55h 25m
SWISS
Deal found 6/29$751
This United Airlines deal was found by Cheapflights users on 6/27. 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 9/135:40 pm
PHL
-
SOF
1 stop17h 30m
United Airlines
Fri 10/26:20 am
SOF
-
PHL
2 stops18h 34m
United Airlines
Deal found 6/27$753
This KAYAK deal was found by Cheapflights users on 6/30. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/610:34 am
PHL
-
SOF
2 stops21h 21m
SWISS
Mon 9/143:40 pm
SOF
-
PHL
2 stops33h 14m
SWISS
Deal found 6/30$754

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 July 2, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$735
(Gotogate)

Popular in

January

Cheapest in

October

Average price

$905
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 ($1,778 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 63% potential price decrease ($535 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 July 2, 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

Tue 9/8

7:40 pm-11:15 pm

2 stops20h 35m

Sofia

Tue 9/15

6:10 am-4:05 pm

1 stop16h 55m

$736

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Wed 8/26

10:30 am-12:10 pm

2 stops18h 40m

Sofia

Wed 9/16

6:20 am-4:05 pm

1 stop16h 45m

$736
Quickest round-trip

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Wed 8/26

5:40 pm-1:25 pm

1 stop12h 45m

Sofia

Wed 9/16

6:20 am-4:05 pm

1 stop16h 45m

$738

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Wed 9/9

7:40 pm-11:15 pm

2 stops20h 35m

Sofia

Tue 9/15

6:10 am-2:47 pm

2 stops15h 37m

$739

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sun 12/6

1:00 pm-10:45 pm

2 stops26h 45m

Sofia

Thu 12/10

6:25 am-4:05 pm

1 stop16h 40m

$740

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sun 12/6

3:20 pm-6:20 pm

2 stops20h 00m

Sofia

Thu 12/10

2:05 pm-4:21 pm

2 stops33h 16m

$747

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sun 9/13

5:40 pm-6:10 pm

1 stop17h 30m

Sofia

Fri 10/2

6:20 am-5:54 pm

2 stops18h 34m

$753

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Wed 9/16

7:40 pm-6:40 pm

2 stops16h 00m

Sofia

Thu 10/1

6:30 am-2:47 pm

2 stops15h 17m

$769
Cheapest one-way
Quickest one-way

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 7/27

10:39 am-11:15 pm

2 stops29h 36m

$517

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 7/20

10:39 am-11:15 pm

2 stops29h 36m

$547

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 11 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 July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
OvagoPrice Accuracy3 starsTrust Score*3 stars
Justfly.comPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
BudgetAirPrice Accuracy2 starsTrust Score*3 stars
BusinessClassPrice Accuracy3 starsTrust 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 $518). 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.

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 July 2, 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
9,926 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.6

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this
United Airlines
7.4
Good
9,926 reviews
United Airlines
7.4
Good
9,926 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.6

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this
Lufthansa
6.8
Okay
8,108 reviews
United Airlines
7.4
Good
9,926 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Food

6.6

Entertainment

7.1

Overall

7.4

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this

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 12h 45m. United Airlines provides one of the quickest options available for as low as $738. 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 ($497), and United Airlines ($540) offers the cheapest pricing from Philadelphia to Sofia. These flights start at 63% 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 $518). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 July 2, 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$497Average$776FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$540Average$614FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.