$344 Cheap Flights from Philadelphia (PHL) to Sofia (SOF)

Philadelphia (PHL) to Sofia (SOF) at a glance

Embark on an adventure from Philadelphia (PHL) to Sofia (SOF) with a range of airlines providing services on this international long-haul route. Explore various options from full-service carriers to find the perfect flight that aligns with your budget, schedule, and travel plans while you discover Sofia's renowned attractions and neighborhoods. Check out essential details for flights departing from Philadelphia International Airport (PHL) to Sofia Airport (SOF).

• Fastest flight duration: around 10 hours in-flight, plus roughly 2h 45m layover with one stop
• Route distance: roughly 4,800 miles (7,720 km)
• Flights per week: around 8 departures on average
• Typical fares (one-way): economy tickets often range from $245–$725, depending on seasonality and how far ahead you book

Flights from Philadelphia International Airport (PHL) to Sofia Airport (SOF)

According to recent travel bookings, here are the top airlines favored by passengers flying from Philadelphia to Sofia, especially for one-stop and multi-stop journeys. Common layovers include Frankfurt International Airport (FRA), with an approximate 2 hour and 45 minute stop, and Zürich Airport (ZRH), where layovers are around 4 hours. This variety allows travelers to mix and match options based on price, total travel time, and cabin class to create the ideal itinerary.

• United: This full-service airline provides both one-stop and multi-stop options. One-way fares generally fall between $270 and $700, representing about 39% of departures on this route. Expect a typical in-flight duration of 10 hours, with a total travel time of approximately 12 hours and 45 minutes.
• Lufthansa: As a full-service carrier, Lufthansa offers one-stop flights with one-way fares typically between $245 and $660. They account for around 24% of departures on this route, with an in-flight time of 10 hours and a total journey duration of about 12 hours and 45 minutes, including layover time.
• British Airways: This full-service airline provides one-stop service, with one-way prices usually ranging from $280 to $645. British Airways comprises roughly 14% of the departures on this route, featuring an in-flight duration of 10 hours and a total travel time of approximately 12 hours and 45 minutes, factoring in the layover.
• American Airlines: Another full-service option, American Airlines offers one-stop flights with one-way fares typically from $400 to $875. They account for about 12% of departures on this route, with an in-flight duration of 10 hours and a total journey time of roughly 12 hours and 45 minutes, including the layover.

How to find the best prices for flights from Philadelphia (PHL) to Sofia (SOF)

Getting some of the best deals on flights from Philadelphia to Sofia is all about timing and flexibility. Here are some key tips to help you save:

1. Best times to book and fly: cheaper fares are usually found when booking 2 to 8 weeks in advance, which aligns with the booking habits of most travelers. Departures in the afternoon, between 12 PM and 6 PM, often offer lower prices and are the most popular flight times. Additionally, flying on Tuesday provides both affordable options and is the favored travel day.
2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Sofia Airport from Philadelphia International Airport

Sofia welcomes travelers from Philadelphia with a range of transport options based on price, convenience, and proximity. Here's how to reach Sofia efficiently:

• Hotel transfer: Transfers offer a convenient way to reach your hotel in Sofia, with private rides that can be arranged in advance.
• Car rental: Renting a car from Sofia Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Sofia Airport on Expedia.
• Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
• Public transportation: From Sofia Airport, several key transport links are conveniently located nearby. Sofia Airport Terminal 2 Station, a metro station, is about 0.7 miles from the airport and easily accessible by car, while Sofia Seaport, a seaport, is approximately 4.6 miles away by car. Additionally, Sofia Central Station, a train station, is located about 5 miles from the airport, also reachable by car.

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 November. 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 2026. You can also book with separate airlines for your outbound and return journeys, from $344 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.