$403 Cheap Flights from Philadelphia (PHL) to Sofia (SOF)

View $403 flight on Sat, Aug 9, 2025Opens in a new window

Popular airlines from Philadelphia Intl. Airport (PHL) to Sofia Airport (SOF)

Cheap Flights from Philadelphia to Sofia (PHL-SOF)

Prices were available within the past 7 days and start at $403 for one-way flights and $597 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Sun, Feb 22 - Wed, Mar 11
PHL
Philadelphia
SOF
Sofia
$597 Roundtrip, found 1 day ago
$597
Roundtrip
found 1 day ago
Select British Airways flight, departing Sun, Feb 22 from Philadelphia to Sofia, returning Wed, Mar 11, priced at $597 found 1 day ago
Air Canada
Sun, Nov 2 - Fri, Dec 5
PHL
Philadelphia
SOF
Sofia
$599 Roundtrip, found 22 hours ago
$599
Roundtrip
found 22 hours ago
Select Air Canada flight, departing Sun, Nov 2 from Philadelphia to Sofia, returning Fri, Dec 5, priced at $599 found 22 hours ago
Lufthansa
Tue, Nov 4 - Tue, Dec 2
PHL
Philadelphia
SOF
Sofia
$603 Roundtrip, just found
$603
Roundtrip
just found
Select Lufthansa flight, departing Tue, Nov 4 from Philadelphia to Sofia, returning Tue, Dec 2, priced at $603 just found
United
Tue, Nov 4 - Tue, Dec 2
PHL
Philadelphia
SOF
Sofia
$603 Roundtrip, just found
$603
Roundtrip
just found
Select United flight, departing Tue, Nov 4 from Philadelphia to Sofia, returning Tue, Dec 2, priced at $603 just found
Air Canada
Tue, Nov 4 - Tue, Dec 2
PHL
Philadelphia
SOF
Sofia
$603 Roundtrip, just found
$603
Roundtrip
just found
Select Air Canada flight, departing Tue, Nov 4 from Philadelphia to Sofia, returning Tue, Dec 2, priced at $603 just found
United
Tue, Nov 4 - Tue, Dec 2
PHL
Philadelphia
SOF
Sofia
$604 Roundtrip, just found
$604
Roundtrip
just found
Select United flight, departing Tue, Nov 4 from Philadelphia to Sofia, returning Tue, Dec 2, priced at $604 just found
Air Canada
Tue, Nov 4 - Tue, Dec 2
PHL
Philadelphia
SOF
Sofia
$606 Roundtrip, just found
$606
Roundtrip
just found
Select Air Canada flight, departing Tue, Nov 4 from Philadelphia to Sofia, returning Tue, Dec 2, priced at $606 just found
United
Tue, Nov 4 - Tue, Dec 2
PHL
Philadelphia
SOF
Sofia
$607 Roundtrip, just found
$607
Roundtrip
just found
Select United flight, departing Tue, Nov 4 from Philadelphia to Sofia, returning Tue, Dec 2, priced at $607 just found
Air Canada
Tue, Nov 4 - Tue, Dec 2
PHL
Philadelphia
SOF
Sofia
$609 Roundtrip, just found
$609
Roundtrip
just found
Select Air Canada flight, departing Tue, Nov 4 from Philadelphia to Sofia, returning Tue, Dec 2, priced at $609 just found
Austrian Airlines
Thu, Oct 16 - Thu, Nov 6
PHL
Philadelphia
SOF
Sofia
$704 Roundtrip, found 20 hours ago
$704
Roundtrip
found 20 hours ago
Select Austrian Airlines flight, departing Thu, Oct 16 from Philadelphia to Sofia, returning Thu, Nov 6, priced at $704 found 20 hours ago

Alternative airports near Sofia

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Sofia Airport SOF. Cheapest and Closest option available. Average driving time to city center is 11 minutes. Flights from $906
SOF
Sofia Airport
CheapestClosest
Average driving time to city center11 min
Flights from $906
Flights from Philadelphia (PHL) to Sofia (SOF)
Origin airport
Philadelphia Intl.
Destination airport
Sofia
Airlines serving
Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, KLM, Lufthansa, Swiss International Air Lines, United
Roundtrip price
$596
Distance
4802 mi

Philadelphia to Sofia Flights

The cheapest times to fly from Philadelphia to Sofia

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Philadelphia to Sofia are during the month of February. You can find some of the cheapest flights from Philadelphia to Sofia with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Philadelphia to Sofia

Sunday is one of the best days to book for cheap flights from Philadelphia to Sofia: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Philadelphia to Sofia

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Philadelphia to Sofia in 2025. You can also book with separate airlines for your outbound and return journeys, from $403 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Philadelphia to Sofia flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Philadelphia to Sofia airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Philadelphia Intl. Airport (PHL) to Sofia Airport (SOF) cost?
Discover the latest flight deals from PHL to SOF by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from PHL to SOF?
The cheapest flights from PHL to SOF are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from PHL to SOF?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from PHL to SOF. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Philadelphia Intl. Airport (PHL) to Sofia Airport (SOF)?
Direct flights from Philadelphia Intl. Airport (PHL) to Sofia Airport (SOF) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your dates and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from PHL to SOF?
Usually you'll find the widest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* However, this can vary based on the season, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Philadelphia Intl. Airport (PHL) to Sofia Airport (SOF)?
To touch down at Sofia Airport (SOF) without delays, pick a flight that leaves from Philadelphia Intl. Airport (PHL) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Philadelphia Intl. Airport (PHL) to Sofia Airport (SOF) last-minute?
Last-minute fares from PHL to SOF are generally more expensive. To secure the best prices, start searching for flights ahead of time. That said, if you're flexible with your travel dates, it's possible to score a cheap ticket just before your departure.
Is it cheaper to book a PHL to SOF flight and hotel package?
You'll typically save money by securing a PHL to SOF flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one convenient place. Once you've selected your preferred accommodations and flights, consider other add-ons like activities, car rentals and tours.
Can I cancel or change the date of my flight from Philadelphia Intl. Airport (PHL) to Sofia Airport (SOF)?
If you booked your PHL to SOF flight within the last 24 hours, you may be able to cancel or modify it without fees. Depending on the airline and the fare type you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal for more details.

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*Available to One Key members.