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$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 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$601
(Justfly.com)

One-way from

$475
(Ovago)

Popular in

May

Cheapest in

February

Average price

$1,114
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. 22% potential increase in price ($235 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($40 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This Justfly.com deal was found by Cheapflights users on 6/10. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/185:35 pmPHL - SOF
1 stop13h 15mMultiple Airlines
Tue 11/256:00 amSOF - PHL
2 stops15h 50mMultiple Airlines
Deal found 6/10$601
This Air Canada deal was found by Cheapflights users on 6/10. 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 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 stops19h 45mAir Canada
Tue 11/256:00 amSOF - PHL
2 stops15h 50mAir Canada
Deal found 6/10$602
This Lufthansa deal was found by Cheapflights users on 6/10. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/65:35 pmPHL - SOF
1 stop17h 15mLufthansa
Wed 9/106:15 amSOF - PHL
1 stop16h 45mLufthansa
Deal found 6/10$682
This United Airlines deal was found by Cheapflights users on 6/12. 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 9/89:20 amPHL - SOF
2 stops25h 30mUnited Airlines
Wed 9/246:15 amSOF - PHL
1 stop16h 45mUnited Airlines
Deal found 6/12$683
This British Airways deal was found by Cheapflights users on 6/10. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/96:35 pmPHL - SOF
1 stop18h 45mBritish Airways
Mon 9/88:00 pmSOF - PHL
1 stop27h 25mBritish Airways
Deal found 6/10$756
This SWISS deal was found by Cheapflights users on 6/12. 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.
Thu 9/111:03 pmPHL - SOF
2 stops38h 02mSWISS
Tue 9/231:15 pmSOF - PHL
2 stops39h 16mSWISS
Deal found 6/12$849

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 12, 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-1:50 pm

1 stop13h 15m

Sofia

Tue 11/25

6:00 am-4:00 pm

1 stop17h 00m

$601

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 11/18

3:30 pm-6:15 pm

2 stops19h 45m

Sofia

Tue 11/25

6:00 am-2:50 pm

2 stops15h 50m

$602

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sun 9/7

10:30 am-12:00 pm

2 stops18h 30m

Sofia

Fri 9/26

6:15 am-9:38 pm

2 stops22h 23m

$684

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Wed 8/6

8:15 am-10:05 am

2 stops18h 50m

Sofia

Mon 9/8

6:40 pm-4:00 pm

1 stop28h 20m

$700

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sat 8/9

6:35 pm-8:20 pm

1 stop18h 45m

Sofia

Mon 9/8

8:00 pm-4:25 pm

1 stop27h 25m

$756

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Thu 9/11

1:03 pm-10:05 am

2 stops38h 02m

Sofia

Tue 9/23

1:15 pm-9:31 pm

2 stops39h 16m

$849

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sat 9/27

1:00 pm-2:00 pm

2 stops18h 00m

Sofia

Sat 10/4

7:00 am-8:58 pm

2 stops20h 58m

$5,703

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Thu 9/25

10:35 am-3:20 pm

2 stops21h 45m

Sofia

Sun 10/5

8:00 am-10:29 pm

2 stops21h 29m

$5,710

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

$483

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

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 12, 2025.
Read reviews from past customers who have flown KLM, Austrian Airlines and SWISS from Philadelphia to Sofia. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,358 reviews

Boarding

7.8

Comfort

7.7

Food

7.2

Overall

7.8

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
KLM
7.8
Good
1,358 reviews
KLM
7.8
Good
1,358 reviews

Boarding

7.8

Comfort

7.7

Food

7.2

Overall

7.8

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
Austrian Airlines
7.6
Good
802 reviews
KLM
7.8
Good
1,358 reviews

Boarding

7.8

Comfort

7.7

Food

7.2

Overall

7.8

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
SWISS
7.5
Good
1,623 reviews
KLM
7.8
Good
1,358 reviews

Boarding

7.8

Comfort

7.7

Food

7.2

Overall

7.8

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
United Airlines
7.4
Good
8,790 reviews
KLM
7.8
Good
1,358 reviews

Boarding

7.8

Comfort

7.7

Food

7.2

Overall

7.8

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
Air Canada
7.1
Good
9,531 reviews
KLM
7.8
Good
1,358 reviews

Boarding

7.8

Comfort

7.7

Food

7.2

Overall

7.8

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.

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, Air Canada ($602), Lufthansa ($681), and United Airlines ($684) 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

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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.
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 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$560Average$776FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$608Average$842FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$646Average$794FlexibilityNo cancel feeOn-time69%

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