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$355+ 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 7/15. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SOF
Jul 6 — Jul 131
Sun 7/6
Sun 7/13
1 adult, Economy
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Cheap 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 1, 2025.

Round-trip from

$580
(Air France)

One-way from

$355
(Kiwi.com)

Popular in

May

Cheapest in

February

Average price

$941
From Philadelphia to Sofia
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One-way flight from Philadelphia to Sofia
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Highest demand for flights based on searches. 23% potential increase in price ($248 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($41 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 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 1, 2025.

This Air France 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/131:38 pmPHL - SOF
2 stops17h 22mMultiple Airlines
Wed 8/277:00 amSOF - PHL
2 stops19h 54mMultiple Airlines
Deal found 6/30$580
This United Airlines deal was found by Cheapflights users on 6/28. 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.
Wed 8/135:35 pmPHL - SOF
1 stop17h 15mUnited Airlines
Wed 8/206:15 amSOF - PHL
2 stops18h 14mUnited Airlines
Deal found 6/28$616
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 8/113:20 pmPHL - SOF
2 stops14h 40mAir Canada
Fri 8/226:00 amSOF - PHL
2 stops47h 07mAir Canada
Deal found 6/29$617
This SWISS deal was found by Cheapflights users on 6/28. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/138:15 amPHL - SOF
2 stops18h 50mSWISS
Wed 8/2012:45 pmSOF - PHL
3 stops35h 36mSWISS
Deal found 6/28$644
This Lufthansa 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/105:35 pmPHL - SOF
1 stop17h 15mLufthansa
Mon 9/16:40 pmSOF - PHL
1 stop28h 20mLufthansa
Deal found 6/30$756
This British Airways 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/96:39 pmPHL - SOF
2 stops18h 41mBritish Airways
Wed 8/279:30 pmSOF - PHL
1 stop25h 55mBritish Airways
Deal found 6/30$786

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 1, 2025.
Use the filters below to find and compare flights from Philadelphia to Sofia that are best for you.

Fly from

Philadelphia

Fly to

Sofia

Route

Depart

Return

Price

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Wed 8/13

1:38 pm-2:00 pm

2 stops17h 22m

Sofia

Wed 8/27

7:00 am-7:54 pm

2 stops19h 54m

$580

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Wed 8/13

5:35 pm-5:50 pm

1 stop17h 15m

Sofia

Wed 8/20

6:15 am-5:29 pm

2 stops18h 14m

$616

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 8/11

3:20 pm-1:00 pm

2 stops14h 40m

Sofia

Fri 8/22

6:00 am-10:07 pm

2 stops47h 07m

$617

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Wed 8/13

8:15 am-10:05 am

2 stops18h 50m

Sofia

Wed 8/20

12:45 pm-5:21 pm

3 stops35h 36m

$644

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sun 8/10

5:35 pm-5:50 pm

1 stop17h 15m

Sofia

Mon 9/1

6:40 pm-4:00 pm

1 stop28h 20m

$756

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sat 8/9

6:39 pm-8:20 pm

2 stops18h 41m

Sofia

Wed 8/27

9:30 pm-4:25 pm

1 stop25h 55m

$786

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 7/15

6:30 am-4:20 pm

3 stops50h 50m

$355

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 7/15

5:35 pm-1:20 pm

1 stop12h 45m

$506

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 7/8

5:35 pm-1:20 pm

1 stop12h 45m

$625

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

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, November is the cheapest month in which you can book a flight from Philadelphia to Sofia (average of $632). Flying from Philadelphia to Sofia in June is currently the most expensive (average of $1,189). 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 1, 2025.
Read reviews from past customers who have flown SWISS, United Airlines, and Air Canada 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.
SWISS
7.5
Good
1,654 reviews

Overall

7.5

Comfort

7.4

Crew

8.2

Boarding

7.6

Entertainment

6.8

Food

7.1

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.
SWISS
7.5
Good
1,654 reviews
SWISS
7.5
Good
1,654 reviews

Overall

7.5

Comfort

7.4

Crew

8.2

Boarding

7.6

Entertainment

6.8

Food

7.1

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.
United Airlines
7.4
Good
8,858 reviews
SWISS
7.5
Good
1,654 reviews

Overall

7.5

Comfort

7.4

Crew

8.2

Boarding

7.6

Entertainment

6.8

Food

7.1

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.
Air Canada
7.1
Good
9,669 reviews
SWISS
7.5
Good
1,654 reviews

Overall

7.5

Comfort

7.4

Crew

8.2

Boarding

7.6

Entertainment

6.8

Food

7.1

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.
Lufthansa
6.8
Okay
7,203 reviews
SWISS
7.5
Good
1,654 reviews

Overall

7.5

Comfort

7.4

Crew

8.2

Boarding

7.6

Entertainment

6.8

Food

7.1

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.
British Airways
6.6
Okay
7,086 reviews
SWISS
7.5
Good
1,654 reviews

Overall

7.5

Comfort

7.4

Crew

8.2

Boarding

7.6

Entertainment

6.8

Food

7.1

Reviews

1 / 20
6.0
Good

Yvette,Nov 2024

BOS - ZRH

Food was not very good and the options were poor. The seat wasn't very comfortable. I would not choose to fly on this airline again. Their website was also difficult to navigate.

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.

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

    According to our current data, United Airlines ($616), Air Canada ($617), and SWISS ($644) offers the cheapest pricing from Philadelphia to Sofia. These flights start at 23% 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, November is the cheapest month in which you can book a flight from Philadelphia to Sofia (average of $632). Flying from Philadelphia to Sofia in June is currently the most expensive (average of $1,189). 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

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Alternative routes for Philadelphia to Sofia

See prices for flight routes from nearby airports that may be better suited for you.
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Top 3 airlines flying from Philadelphia to Sofia

Discover the top 3 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 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$560Average$776FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$617Average$844FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$646Average$794FlexibilityNo cancel feeOn-time69%

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