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$622+ 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 3/8. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — PHL
Feb 26 — Mar 51
Thu 2/26
Thu 3/5
1 adult, Economy
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Cheap 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 January 27, 2026.

This British Airways deal was found by Cheapflights users on 1/26. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/82:30 pm
SOF
-
PHL
1 stop30h 05m
British Airways
Sun 3/154:43 pm
PHL
-
SOF
2 stops17h 37m
British Airways
Deal found 1/26$622
This United Airlines deal was found by Cheapflights users on 1/26. 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.
Sun 3/86:10 am
SOF
-
PHL
1 stop16h 55m
United Airlines
Sun 3/156:40 pm
PHL
-
SOF
1 stop12h 55m
United Airlines
Deal found 1/26$691
This Air Canada deal was found by Cheapflights users on 1/26. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/86:10 am
SOF
-
PHL
3 stops22h 34m
Air Canada
Sun 3/153:30 pm
PHL
-
SOF
2 stops20h 50m
Air Canada
Deal found 1/26$1,145
This Mytrip deal was found by Cheapflights users on 1/26. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/811:00 am
SOF
-
PHL
2 stops17h 46m
Multiple Airlines
Sun 3/153:30 pm
PHL
-
SOF
3 stops26h 40m
Multiple Airlines
Deal found 1/26$1,200

Find 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 January 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$622
(British Airways)

Popular in

December

Cheapest in

September

Average price

$624
Provider with most accurate pricing for Sofia-Philadelphia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Sofia-Philadelphia flights.
Search Deals
From Sofia to Philadelphia
Search Deals
Highest demand for flights based on searches. 1% potential increase in price ($9 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

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 January 27, 2026.
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

Sun 3/8

2:30 pm-2:35 pm

1 stop30h 05m

Philadelphia

Sun 3/15

8:40 pm-4:20 pm

1 stop13h 40m

$622

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Sun 3/8

6:10 am-4:05 pm

1 stop16h 55m

Philadelphia

Sun 3/15

6:40 pm-1:35 pm

1 stop12h 55m

$691

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Sun 3/8

6:10 am-9:44 pm

3 stops22h 34m

Philadelphia

Sun 3/15

3:30 pm-6:20 pm

2 stops20h 50m

$1,145

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Sun 3/8

11:00 am-10:46 pm

2 stops17h 46m

Philadelphia

Sun 3/15

3:30 pm-12:10 am

3 stops26h 40m

$1,200

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/25

  • 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 $528). 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.

How much does it cost to fly round-trip from Sofia to Philadelphia?

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 January 27, 2026.
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
9,205 reviews

Entertainment

7.1

Crew

8.1

Food

6.6

Overall

7.4

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
United Airlines
7.4
Good
9,205 reviews
United Airlines
7.4
Good
9,205 reviews

Entertainment

7.1

Crew

8.1

Food

6.6

Overall

7.4

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
Lufthansa
6.8
Okay
7,749 reviews
United Airlines
7.4
Good
9,205 reviews

Entertainment

7.1

Crew

8.1

Food

6.6

Overall

7.4

Comfort

7.3

Boarding

7.7

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats

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 British Airways and United Airlines fly from Sofia to Philadelphia in about 16h 55m. The time it takes to get you to your destination can typically vary by up to 13h 10m. 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 ($671) offers the cheapest pricing from Sofia to Philadelphia. United Airlines is priced at 18% 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 $528). 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
Pottstown
Reading
Ocean City
King of Prussia
Cherry Hill
Lewes
Dewey Beach
Ephrata
Camden
Vineland
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Millville
Newark
Chester

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 Newark flights
Sofia to John F Kennedy Intl 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 January 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$588Average$758FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$671Average$792FlexibilityNo cancel feeOn-time76%

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