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$562+ Cheap flights from Sofia (SOF) to Philadelphia (PHL)

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 10/13. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — PHL
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
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 septiembre 11, 2025.

Round-trip from

$562
(American Airlines)

Popular in

November

Cheapest in

March

Average price

$602
From Sofia to Philadelphia
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($68 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in September 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 septiembre 11, 2025.

This American Airlines deal was found by Cheapflights users on 9/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/138:00 pmSOF - PHL
1 stop24h 05mAmerican Airlines
dom. 10/196:30 pmPHL - SOF
1 stop17h 40mAmerican Airlines
Deal found 9/11$562
This United Airlines deal was found by Cheapflights users on 9/8. 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.
jue. 10/26:15 amSOF - PHL
1 stop16h 45mUnited Airlines
dom. 11/308:00 pmPHL - SOF
2 stops19h 45mUnited Airlines
Deal found 9/8$648
This United Airlines deal was found by Cheapflights users on 9/11. 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.
dom. 10/266:10 amSOF - PHL
2 stops33h 36mUnited Airlines
dom. 11/28:00 pmPHL - SOF
2 stops19h 45mUnited Airlines
Deal found 9/11$652
This United Airlines deal was found by Cheapflights users on 9/11. 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.
sáb. 9/206:00 amSOF - PHL
2 stops34h 33mUnited Airlines
sáb. 10/114:50 pmPHL - SOF
2 stops35h 25mUnited Airlines
Deal found 9/11$682
This Cheapflightsfares deal was found by Cheapflights users on 9/9. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/206:55 pmSOF - PHL
2 stops28h 05mAustrian Airlines
sáb. 10/117:30 amPHL - SOF
2 stops21h 10mAustrian Airlines
Deal found 9/9$700
This Ovago deal was found by Cheapflights users on 9/10. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/206:25 amSOF - PHL
1 stop13h 40mMultiple Airlines
sáb. 10/1110:15 pmPHL - SOF
1 stop15h 05mMultiple Airlines
Deal found 9/10$818
This Expedia deal was found by Cheapflights users on 9/11. 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.
dom. 10/262:30 pmSOF - PHL
2 stops49h 09mBritish Airways
dom. 11/27:45 pmPHL - SOF
1 stop13h 35mBritish Airways
Deal found 9/11$840

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 septiembre 11, 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

lun. 10/13

8:00 pm-1:05 pm

1 stop24h 05m

Philadelphia

dom. 10/19

6:30 pm-7:10 pm

1 stop17h 40m

$562

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

jue. 10/2

6:15 am-4:00 pm

1 stop16h 45m

Philadelphia

dom. 11/30

8:00 pm-10:45 pm

2 stops19h 45m

$648

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

dom. 10/26

6:10 am-9:46 am

2 stops33h 36m

Philadelphia

dom. 11/2

8:00 pm-10:45 pm

2 stops19h 45m

$652

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

jue. 1/1

7:55 am-11:30 pm

2 stops22h 35m

Philadelphia

dom. 3/1

5:40 pm-6:00 pm

1 stop17h 20m

$671

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

jue. 1/1

7:55 am-4:05 pm

2 stops15h 10m

Philadelphia

dom. 3/1

3:30 pm-1:10 pm

2 stops14h 40m

$721

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

dom. 10/26

2:30 pm-9:39 am

2 stops49h 09m

Philadelphia

dom. 11/2

7:45 pm-4:20 pm

1 stop13h 35m

$840

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

jue. 10/2

7:00 am-1:00 pm

1 stop13h 00m

Philadelphia

dom. 11/30

7:45 pm-4:20 pm

1 stop13h 35m

$846

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

jue. 10/2

1:30 pm-9:05 am

1 stop26h 35m

$614

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

jue. 10/2

6:55 pm-4:00 pm

2 stops28h 05m

$649

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

jue. 10/2

12:45 pm-9:28 pm

3 stops39h 43m

$768

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/8

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, August is the cheapest month in which you can book a flight from Sofia to Philadelphia (average of $236). Flying from Sofia to Philadelphia in March is currently the most expensive (average of $295). 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 septiembre 11, 2025.

It’s optimal to fly from Sofia to Philadelphia at noon. By choosing this option you can save up to 13% 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 septiembre 11, 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
8,937 reviews

Food

6.6

Boarding

7.7

Overall

7.4

Entertainment

7.1

Crew

8.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
8,937 reviews
United Airlines
7.4
Good
8,937 reviews

Food

6.6

Boarding

7.7

Overall

7.4

Entertainment

7.1

Crew

8.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
Lufthansa
6.8
Okay
7,409 reviews
United Airlines
7.4
Good
8,937 reviews

Food

6.6

Boarding

7.7

Overall

7.4

Entertainment

7.1

Crew

8.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

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 American Airlines and United Airlines fly from Sofia to Philadelphia in about 16h 45m. The time it takes to get you to your destination can typically vary by up to 7h 20m. Airlines will cover a distance of 4800 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    According to our current data, United Airlines ($588), and Lufthansa ($602) offers the cheapest pricing from Sofia to Philadelphia. United Airlines is priced at 19% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Sofia to Philadelphia one-way?

    One-way options have recently been found by users for as low as $614 on Qatar Airways. Other airlines that offer cheap prices include Austrian Airlines from $649 and SWISS from $768 one-way.

  • 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, August is the cheapest month in which you can book a flight from Sofia to Philadelphia (average of $236). Flying from Sofia to Philadelphia in March is currently the most expensive (average of $295). 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
Vineland
Wildwood
King of Prussia
Pottstown
Reading
Dewey Beach
Ephrata
Camden
Ocean City
Cherry Hill
Dover
Elkton
Essington
Willow Grove
Newark
Millville
Chester
Exton
Havre de Grace
Plymouth Meeting

Browse thousands of different options on Cheapflights for your next trip

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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 Newark flights
Sofia to LaGuardia 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 septiembre 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$588Average$755FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$602Average$774FlexibilityNo cancel feeOn-time76%

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