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$388+ Cheap flights from Sofia (SOF) to Philadelphia (PHL)

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 3/15. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — PHL
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
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Cheap flight deals from Sofia to Philadelphia

Discover tips and strategies to find the most affordable flight options for your journey from Sofia (SOF) to Philadelphia (PHL). 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 October 28, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
1 star

Round-trip from

$675
(United Airlines)

One-way from

$388
(Orbitz)

Popular in

November

Cheapest in

March

Average price

$800
Provider with most accurate pricing for Sofia-Philadelphia flight deals.
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Provider most trusted by Cheapflights users for Sofia-Philadelphia flights.
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From Sofia to Philadelphia
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One-way flight from Sofia to Philadelphia
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Highest demand for flights based on searches. 11% potential increase in price ($100 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($23 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Sofia to Philadelphia

Cheapest flights from Sofia to Philadelphia
Explore the most affordable flight options available from Sofia to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 28, 2025.

This United Airlines deal was found by Cheapflights users on 10/27. 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.
Fri 11/76:10 amSOF - PHL
2 stops23h 53mUnited Airlines
Sat 11/226:10 pmPHL - SOF
1 stop12h 30mUnited Airlines
Deal found 10/27$675
This United Airlines deal was found by Cheapflights users on 10/27. 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.
Tue 12/236:00 amSOF - PHL
2 stops25h 45mUnited Airlines
Sun 1/46:34 pmPHL - SOF
2 stops35h 51mUnited Airlines
Deal found 10/27$729
This United Airlines deal was found by Cheapflights users on 10/26. 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 12/56:10 amSOF - PHL
2 stops34h 25mUnited Airlines
Sat 12/138:05 pmPHL - SOF
2 stops43h 40mUnited Airlines
Deal found 10/26$772
This United Airlines deal was found by Cheapflights users on 10/27. 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.
Wed 12/242:25 pmSOF - PHL
2 stops16h 05mUnited Airlines
Sun 1/46:34 pmPHL - SOF
2 stops45h 11mUnited Airlines
Deal found 10/27$795
This KLM deal was found by Cheapflights users on 10/28. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/57:00 amSOF - PHL
2 stops16h 56mMultiple Airlines
Sat 12/131:23 pmPHL - SOF
2 stops17h 32mMultiple Airlines
Deal found 10/28$805
This Gurufare deal was found by Cheapflights users on 10/27. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/76:45 pmSOF - PHL
1 stop28h 50mLufthansa
Sat 11/226:10 pmPHL - SOF
1 stop12h 30mLufthansa
Deal found 10/27$812
This Mytrip deal was found by Cheapflights users on 10/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/218:00 pmSOF - PHL
2 stops27h 00mMultiple Airlines
Sun 1/45:30 pmPHL - SOF
3 stops23h 25mMultiple Airlines
Deal found 10/27$818

Cheapflights Fare Finder

 
Customize your flight search to find flights from Sofia to Philadelphia 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 October 28, 2025.
Use the filters below to find and compare flights from Sofia to Philadelphia that are best for you.

Fly from

Sofia

Fly to

Philadelphia

Route

Depart

Return

Price

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Fri 11/7

6:10 am-11:03 pm

2 stops23h 53m

Philadelphia

Sat 11/22

6:10 pm-1:40 pm

1 stop12h 30m

$675

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Tue 12/23

6:00 am-12:45 am

2 stops25h 45m

Philadelphia

Sun 1/4

6:34 pm-1:25 pm

2 stops35h 51m

$729

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Fri 12/5

6:10 am-9:35 am

2 stops34h 25m

Philadelphia

Sat 12/13

8:05 pm-10:45 pm

2 stops43h 40m

$772

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Wed 12/24

6:10 am-11:30 pm

2 stops24h 20m

Philadelphia

Sun 1/4

6:00 am-11:50 am

2 stops22h 50m

$788

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Fri 12/5

7:00 am-4:56 pm

2 stops16h 56m

Philadelphia

Sat 12/13

1:23 pm-1:55 pm

2 stops17h 32m

$805

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Sun 12/21

8:00 pm-4:00 pm

2 stops27h 00m

Philadelphia

Sun 1/4

5:30 pm-10:45 pm

2 stops22h 15m

$819

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Sun 3/15

2:30 pm-2:10 pm

1 stop29h 40m

$388

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Sun 3/15

10:45 am-5:00 pm

3 stops36h 15m

$516

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Sat 3/14

1:05 am-9:32 pm

2 stops26h 27m

$7,752

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

  • Most accurate provider: When it comes to deals on Sofia-Philadelphia flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Sofia-Philadelphia flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Sofia-Philadelphia flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Sofia-Philadelphia 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 Sofia-Philadelphia 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 Sofia to Philadelphia

Have a flexible travel schedule? Discover the best time to fly to Philadelphia from Sofia 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 Sofia to Philadelphia

What is the cheapest month to book a flight from Sofia to Philadelphia?

Currently, February is the cheapest month in which you can book a flight from Sofia to Philadelphia (average of $521). Flying from Sofia to Philadelphia in July is currently the most expensive (average of $612). 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.

What is the cheapest time of day to fly from SOF to PHL?

Find hourly flight availability from Sofia to Philadelphia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 28, 2025.

It’s optimal to fly from Sofia to Philadelphia at noon. By choosing this option you can save up to 14% on the cost of your flight, compared to a flight in the morning.

Reviews of airlines servicing Philadelphia

Get insights into the airlines that provide service to Philadelphia. 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 Philadelphia. Reviews last updated October 28, 2025.
Read reviews from past customers who have flown United Airlines and Lufthansa from Sofia to Philadelphia. 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
9,001 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
United Airlines
7.4
Good
9,001 reviews
United Airlines
7.4
Good
9,001 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
Lufthansa
6.8
Okay
7,535 reviews
United Airlines
7.4
Good
9,001 reviews

Boarding

7.7

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Food

6.6

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

Related info for your journey

Find useful and relevant information for your journey from Sofia to Philadelphia. 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 Sofia to Philadelphia?

    Airlines like United Airlines fly from Sofia to Philadelphia in about 23h 53m. The time it takes to get you to your destination can typically vary by up to . Airlines will cover a distance of 4800 mi.

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

    According to our current data, United Airlines ($588), and Lufthansa ($636) offers the cheapest pricing from Sofia to Philadelphia. United Airlines is priced at 20% lower than the current average price of a flight leaving 3 months from now.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Sofia to Philadelphia 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 Sofia to Philadelphia?

    Currently, February is the cheapest month in which you can book a flight from Sofia to Philadelphia (average of $521). Flying from Sofia to Philadelphia in July is currently the most expensive (average of $612). 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

Traveling to a place near Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Wildwood
King of Prussia
Pottstown
Reading
Ocean City
Cherry Hill
Dewey Beach
Ephrata
Camden
Vineland
Milford
Dover
Elkton
Essington
Willow Grove
Newark
Millville
Chester
Exton
Havre de Grace

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Alternative routes for Sofia to Philadelphia

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

Top 2 airlines flying from Sofia to Philadelphia

Discover the top 2 airlines that operate flights from Sofia to Philadelphia. 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 October 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$588Average$755FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$602Average$774FlexibilityNo cancel feeOn-time76%

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