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$423+ 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 9/29. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — PHL
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
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 July 29, 2025.

Round-trip from

$585
(Lufthansa)

One-way from

$423
(Kiwi.com)

Popular in

November

Cheapest in

March

Average price

$814
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. 5% potential increase in price ($44 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 July 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 July 29, 2025.

This Lufthansa deal was found by Cheapflights users on 7/29. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/46:15 amSOF - PHL
1 stop16h 45mLufthansa
Mon 9/85:35 pmPHL - SOF
1 stop17h 15mLufthansa
Deal found 7/29$585
This United Airlines deal was found by Cheapflights users on 7/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/256:15 amSOF - PHL
1 stop17h 55mUnited Airlines
Mon 9/13:00 pmPHL - SOF
2 stops25h 00mUnited Airlines
Deal found 7/28$587
This Austrian Airlines deal was found by Cheapflights users on 7/29. 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 Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/266:55 pmSOF - PHL
2 stops29h 15mAustrian Airlines
Tue 9/25:35 pmPHL - SOF
2 stops14h 45mAustrian Airlines
Deal found 7/29$680
This SWISS deal was found by Cheapflights users on 7/27. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/261:15 pmSOF - PHL
2 stops34h 55mSWISS
Tue 9/21:03 pmPHL - SOF
3 stops38h 02mSWISS
Deal found 7/27$702
This British Airways deal was found by Cheapflights users on 7/28. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/152:20 pmSOF - PHL
1 stop33h 05mBritish Airways
Thu 9/46:30 pmPHL - SOF
1 stop12h 00mBritish Airways
Deal found 7/28$865
This Lufthansa deal was found by Cheapflights users on 7/27. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/276:55 pmSOF - PHL
2 stops29h 15mMultiple Airlines
Sun 8/176:45 pmPHL - SOF
2 stops16h 55mMultiple Airlines
Deal found 7/27$998

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 July 29, 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

Thu 9/4

6:15 am-4:00 pm

1 stop16h 45m

Philadelphia

Mon 9/8

5:35 pm-5:50 pm

1 stop17h 15m

$585

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Mon 8/25

6:15 am-5:10 pm

1 stop17h 55m

Philadelphia

Mon 9/1

3:00 pm-11:00 pm

2 stops25h 00m

$587

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Tue 8/26

6:55 pm-5:10 pm

2 stops29h 15m

Philadelphia

Tue 9/2

5:35 pm-3:20 pm

2 stops14h 45m

$680

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Tue 8/26

1:15 pm-5:10 pm

2 stops34h 55m

Philadelphia

Tue 9/2

1:03 pm-10:05 am

3 stops38h 02m

$702

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Fri 8/15

2:20 pm-4:25 pm

1 stop33h 05m

Philadelphia

Thu 9/4

6:30 pm-1:30 pm

1 stop12h 00m

$865

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Mon 9/29

6:10 am-11:59 pm

2 stops24h 49m

$423

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Mon 9/29

6:15 am-4:00 pm

1 stop16h 45m

$571

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Mon 9/29

3:30 pm-9:28 pm

3 stops36h 58m

$777

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/26

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 July 29, 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 July 29, 2025.
Read reviews from past customers who have flown Austrian Airlines, SWISS, and United Airlines 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.
Austrian Airlines
7.6
Good
821 reviews

Boarding

7.6

Overall

7.6

Entertainment

6.8

Comfort

7.3

Crew

8.1

Food

6.8

Reviews

1 / 20
10.0
Excellent

Dominik,Jun 2025

VIE - VNO

Good service and update all information. I feel like i wanna use it again next time
Austrian Airlines
7.6
Good
821 reviews
Austrian Airlines
7.6
Good
821 reviews

Boarding

7.6

Overall

7.6

Entertainment

6.8

Comfort

7.3

Crew

8.1

Food

6.8

Reviews

1 / 20
10.0
Excellent

Dominik,Jun 2025

VIE - VNO

Good service and update all information. I feel like i wanna use it again next time
SWISS
7.5
Good
1,683 reviews
Austrian Airlines
7.6
Good
821 reviews

Boarding

7.6

Overall

7.6

Entertainment

6.8

Comfort

7.3

Crew

8.1

Food

6.8

Reviews

1 / 20
10.0
Excellent

Dominik,Jun 2025

VIE - VNO

Good service and update all information. I feel like i wanna use it again next time
United Airlines
7.4
Good
8,899 reviews
Austrian Airlines
7.6
Good
821 reviews

Boarding

7.6

Overall

7.6

Entertainment

6.8

Comfort

7.3

Crew

8.1

Food

6.8

Reviews

1 / 20
10.0
Excellent

Dominik,Jun 2025

VIE - VNO

Good service and update all information. I feel like i wanna use it again next time
Lufthansa
6.8
Okay
7,265 reviews
Austrian Airlines
7.6
Good
821 reviews

Boarding

7.6

Overall

7.6

Entertainment

6.8

Comfort

7.3

Crew

8.1

Food

6.8

Reviews

1 / 20
10.0
Excellent

Dominik,Jun 2025

VIE - VNO

Good service and update all information. I feel like i wanna use it again next time
British Airways
6.6
Okay
7,208 reviews
Austrian Airlines
7.6
Good
821 reviews

Boarding

7.6

Overall

7.6

Entertainment

6.8

Comfort

7.3

Crew

8.1

Food

6.8

Reviews

1 / 20
10.0
Excellent

Dominik,Jun 2025

VIE - VNO

Good service and update all information. I feel like i wanna use it again next time

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.

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

    According to our current data, Lufthansa ($585), United Airlines ($587), and Austrian Airlines ($680) offers the cheapest pricing from Sofia to Philadelphia. Lufthansa is priced at 22% 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, 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
Cherry Hill
Ocean City
Chester
Millville
Reading
Ephrata
Camden
Dewey Beach
Dover
Elkton
Essington
Willow Grove
Newark
Exton
Glen Mills
Springfield

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 LaGuardia flights
Sofia to John F Kennedy Intl 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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$588Average$755FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$636Average$773FlexibilityNo cancel feeOn-time76%

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