HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Sofia

$475+ 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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — SOF
Jun 21 — Jun 281
Sat 6/21
Sat 6/28
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Philadelphia to Sofia with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 June 16, 2025.

Round-trip from

$603
(FlightHub)

One-way from

$475
(Ovago)

Popular in

May

Cheapest in

February

Average price

$1,114
From Philadelphia to Sofia
Search Deals
One-way flight from Philadelphia to Sofia
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($235 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($40 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
Search Deals

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 June 16, 2025.

This FlightHub deal was found by Cheapflights users on 6/15. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/185:35 pmPHL - SOF
1 stop17h 40mLufthansa
Tue 11/256:00 amSOF - PHL
1 stop17h 00mLufthansa
Deal found 6/15$603
This Air Canada deal was found by Cheapflights users on 6/15. 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.
Tue 11/183:30 pmPHL - SOF
2 stops15h 20mAir Canada
Tue 11/256:00 amSOF - PHL
2 stops15h 50mAir Canada
Deal found 6/15$604
This Gotogate deal was found by Cheapflights users on 6/15. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/123:20 pmPHL - SOF
2 stops15h 00mMultiple Airlines
Thu 8/286:15 amSOF - PHL
2 stops22h 52mMultiple Airlines
Deal found 6/15$663
This SWISS deal was found by Cheapflights users on 6/15. 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 8/128:15 amPHL - SOF
2 stops18h 50mSWISS
Thu 8/2812:45 pmSOF - PHL
3 stops35h 36mSWISS
Deal found 6/15$721
This United Airlines deal was found by Cheapflights users on 6/15. 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 12/1910:15 amPHL - SOF
2 stops29h 30mUnited Airlines
Thu 12/252:35 pmSOF - PHL
2 stops15h 21mUnited Airlines
Deal found 6/15$976
This KLM deal was found by Cheapflights users on 6/14. 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.
Sat 8/211:55 amPHL - SOF
2 stops19h 05mKLM
Sat 8/97:00 amSOF - PHL
2 stops19h 59mKLM
Deal found 6/14$1,058
This Gurufare deal was found by Cheapflights users on 6/14. 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.
Sat 8/26:35 pmPHL - SOF
1 stop18h 45mBritish Airways
Mon 8/118:00 pmSOF - PHL
1 stop27h 25mBritish Airways
Deal found 6/14$1,164
This oojo deal was found by Cheapflights users on 6/14. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/35:40 pmPHL - SOF
2 stops19h 45mTurkish Airlines
Sun 7/209:15 pmSOF - PHL
2 stops43h 23mTurkish Airlines
Deal found 6/14$1,329

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 June 16, 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

Tue 11/18

5:35 pm-6:15 pm

1 stop17h 40m

Sofia

Tue 11/25

6:00 am-4:00 pm

1 stop17h 00m

$603

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 11/18

3:30 pm-1:50 pm

2 stops15h 20m

Sofia

Tue 11/25

6:00 am-2:50 pm

2 stops15h 50m

$604

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 8/11

8:15 am-10:05 am

2 stops42h 50m

Sofia

Wed 8/27

6:15 am-4:00 pm

1 stop16h 45m

$652

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 8/12

8:15 am-10:05 am

2 stops18h 50m

Sofia

Thu 8/28

12:45 pm-5:21 pm

3 stops35h 36m

$721

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Thu 7/31

9:20 am-1:05 pm

2 stops20h 45m

Sofia

Sun 8/10

8:00 am-9:55 am

2 stops32h 55m

$1,020

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sat 8/2

11:55 am-2:00 pm

2 stops19h 05m

Sofia

Sat 8/9

7:00 am-7:59 pm

2 stops19h 59m

$1,058

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sat 8/2

6:35 pm-8:20 pm

1 stop18h 45m

Sofia

Mon 8/11

8:00 pm-4:25 pm

1 stop27h 25m

$1,164

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Thu 7/3

5:40 pm-8:25 pm

2 stops19h 45m

Sofia

Sun 7/20

9:15 pm-9:38 am

2 stops43h 23m

$1,329

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 9/8

7:25 pm-8:40 pm

2 stops42h 15m

$475

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 9/8

5:35 pm-5:50 pm

1 stop17h 15m

$484

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/14

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 $1,203). 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.

Rainfall in Sofia by month

Plan your trip to Sofia by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Sofia ranges from 1.2 - 2.8 inches per month. June is typically the wettest month, when rainfall can reach 2.8 in. January is typically the driest time to visit Sofia when rainfall is around 1.2 in.

Temperature in Sofia by month

Plan your trip to Sofia by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Sofia, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

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 June 16, 2025.
KLM
7.8
Good
1,361 reviews

Food

7.2

Crew

8.4

Overall

7.8

Entertainment

7.1

Boarding

7.8

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
KLM
7.8
Good
1,361 reviews
KLM
7.8
Good
1,361 reviews

Food

7.2

Crew

8.4

Overall

7.8

Entertainment

7.1

Boarding

7.8

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
SWISS
7.5
Good
1,628 reviews
KLM
7.8
Good
1,361 reviews

Food

7.2

Crew

8.4

Overall

7.8

Entertainment

7.1

Boarding

7.8

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
United Airlines
7.4
Good
8,801 reviews
KLM
7.8
Good
1,361 reviews

Food

7.2

Crew

8.4

Overall

7.8

Entertainment

7.1

Boarding

7.8

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Turkish Airlines
7.3
Good
3,852 reviews
KLM
7.8
Good
1,361 reviews

Food

7.2

Crew

8.4

Overall

7.8

Entertainment

7.1

Boarding

7.8

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Air Canada
7.1
Good
9,554 reviews
KLM
7.8
Good
1,361 reviews

Food

7.2

Crew

8.4

Overall

7.8

Entertainment

7.1

Boarding

7.8

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

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, Lufthansa ($603), Air Canada ($604), and SWISS ($721) offers the cheapest pricing from Philadelphia to Sofia. These flights start at 26% 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 $1,203). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Philadelphia to Sofia

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

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 June 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$560Average$776FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$617Average$846FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$646Average$794FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.