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$597+ 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 8/22. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — PHL
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$632
(United Airlines)

One-way from

$597
(Qatar Airways)

Popular in

November

Cheapest in

March

Average price

$727
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 June 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 June 12, 2025.

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.
Thu 6/266:15 amSOF - PHL
1 stop16h 45mUnited Airlines
Wed 7/25:35 pmPHL - SOF
1 stop12h 40mUnited Airlines
Deal found 6/12$632
This Lufthansa 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/266:00 amSOF - PHL
2 stops17h 00mLufthansa
Wed 7/25:35 pmPHL - SOF
1 stop12h 40mLufthansa
Deal found 6/12$657
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 6/2610:50 amSOF - PHL
2 stops36h 10mSWISS
Wed 7/28:15 amPHL - SOF
3 stops44h 45mSWISS
Deal found 6/12$1,090

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 June 12, 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 6/26

6:15 am-4:00 pm

1 stop16h 45m

Philadelphia

Wed 7/2

5:35 pm-1:15 pm

1 stop12h 40m

$632

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Thu 6/26

6:00 am-4:00 pm

2 stops17h 00m

Philadelphia

Wed 7/2

5:35 pm-1:15 pm

1 stop12h 40m

$657

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Thu 6/26

10:50 am-4:00 pm

2 stops36h 10m

Philadelphia

Wed 7/2

8:15 am-12:00 pm

3 stops44h 45m

$1,090

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Fri 8/22

1:30 pm-9:05 am

1 stop26h 35m

$597

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Mon 7/14

8:00 pm-4:25 pm

1 stop27h 25m

$619

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Tue 8/19

7:00 am-10:42 pm

3 stops46h 42m

$659

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Mon 7/14

6:15 am-4:00 pm

1 stop16h 45m

$703

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Mon 7/14

6:00 am-9:54 am

2 stops34h 54m

$717

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Tue 8/19

6:00 am-10:07 pm

2 stops23h 07m

$721

SofiaPhiladelphia

SOF - PHL

SOFPHL

Sofia

Wed 8/20

12:45 pm-5:21 pm

3 stops35h 36m

$749

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

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 June 12, 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.

Rainfall in Philadelphia by month

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

In terms of precipitation, rainfall in Philadelphia ranges from 2.7 - 4.4 inches per month. July is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Philadelphia when rainfall is around 2.7 in.

Temperature in Philadelphia by month

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

If weather is an important factor for your trip to Philadelphia, 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 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

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 June 12, 2025.
SWISS
7.5
Good
1,623 reviews

Food

7.0

Boarding

7.6

Comfort

7.4

Overall

7.5

Entertainment

6.7

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Kristina,Nov 2024

ZRH - BER

Never got on the flight due to my first plane being so delayed
SWISS
7.5
Good
1,623 reviews
SWISS
7.5
Good
1,623 reviews

Food

7.0

Boarding

7.6

Comfort

7.4

Overall

7.5

Entertainment

6.7

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Kristina,Nov 2024

ZRH - BER

Never got on the flight due to my first plane being so delayed
Qatar Airways
7.4
Good
3,584 reviews
SWISS
7.5
Good
1,623 reviews

Food

7.0

Boarding

7.6

Comfort

7.4

Overall

7.5

Entertainment

6.7

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Kristina,Nov 2024

ZRH - BER

Never got on the flight due to my first plane being so delayed
United Airlines
7.4
Good
8,790 reviews
SWISS
7.5
Good
1,623 reviews

Food

7.0

Boarding

7.6

Comfort

7.4

Overall

7.5

Entertainment

6.7

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Kristina,Nov 2024

ZRH - BER

Never got on the flight due to my first plane being so delayed
Air Canada
7.1
Good
9,531 reviews
SWISS
7.5
Good
1,623 reviews

Food

7.0

Boarding

7.6

Comfort

7.4

Overall

7.5

Entertainment

6.7

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Kristina,Nov 2024

ZRH - BER

Never got on the flight due to my first plane being so delayed
Lufthansa
6.8
Okay
7,136 reviews
SWISS
7.5
Good
1,623 reviews

Food

7.0

Boarding

7.6

Comfort

7.4

Overall

7.5

Entertainment

6.7

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Kristina,Nov 2024

ZRH - BER

Never got on the flight due to my first plane being so delayed

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, United Airlines ($632), Lufthansa ($657), and SWISS ($1,090) offers the cheapest pricing from Sofia to Philadelphia. United Airlines is priced at 15% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from Sofia to Philadelphia one-way?

    One-way options have recently been found by users for as low as $597 on Qatar Airways. Other airlines that offer cheap prices include British Airways from $619 and Lufthansa from $703 one-way.

  • 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 Sofia?

Book flights to Sofia if you plan to visit one of these locations
Vineland
Wildwood
Pottstown
King of Prussia
Cherry Hill
Exton
Ocean City
Chester
Essington
Reading
Newark
Middletown
Millville
Ephrata
Camden
Dover
Elkton
Willow Grove
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 Newark flights
Sofia to John F Kennedy Intl flights
Sofia to Dulles Intl flights
Sofia to LaGuardia 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$588Average$755FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$636Average$777FlexibilityNo cancel feeOn-time76%

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