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$352 Cheap Flights from Philadelphia (PHL) to Sofia (SOF)

View $352 flight on Mon, Nov 16, 2026Opens in a new window

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

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Cheap Flights from Philadelphia to Sofia (PHL-SOF)

Prices were available within the past 7 days and start at $352 for one-way flights and $704 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Mon, Aug 10 - Wed, Aug 26
PHL
Philadelphia
SOF
Sofia
$704 Roundtrip, found 1 hour ago
$704
Roundtrip
found 1 hour ago
Select Air Canada flight, departing Mon, Aug 10 from Philadelphia to Sofia, returning Wed, Aug 26, priced at $704 found 1 hour ago
United
Sun, Nov 1 - Tue, Nov 10
PHL
Philadelphia
SOF
Sofia
$706 Roundtrip, found 2 hours ago
$706
Roundtrip
found 2 hours ago
Select United flight, departing Sun, Nov 1 from Philadelphia to Sofia, returning Tue, Nov 10, priced at $706 found 2 hours ago
United
Sun, Nov 1 - Tue, Nov 10
PHL
Philadelphia
SOF
Sofia
$709 Roundtrip, found 2 hours ago
$709
Roundtrip
found 2 hours ago
Select United flight, departing Sun, Nov 1 from Philadelphia to Sofia, returning Tue, Nov 10, priced at $709 found 2 hours ago
Air Canada
Sun, Nov 1 - Tue, Nov 10
PHL
Philadelphia
SOF
Sofia
$712 Roundtrip, found 2 hours ago
$712
Roundtrip
found 2 hours ago
Select Air Canada flight, departing Sun, Nov 1 from Philadelphia to Sofia, returning Tue, Nov 10, priced at $712 found 2 hours ago
Lufthansa
Mon, Aug 10 - Wed, Aug 26
PHL
Philadelphia
SOF
Sofia
$713 Roundtrip, found 1 hour ago
$713
Roundtrip
found 1 hour ago
Select Lufthansa flight, departing Mon, Aug 10 from Philadelphia to Sofia, returning Wed, Aug 26, priced at $713 found 1 hour ago
United
Sun, Nov 1 - Tue, Nov 10
PHL
Philadelphia
SOF
Sofia
$714 Roundtrip, found 2 hours ago
$714
Roundtrip
found 2 hours ago
Select United flight, departing Sun, Nov 1 from Philadelphia to Sofia, returning Tue, Nov 10, priced at $714 found 2 hours ago
Air Canada
Sun, Nov 1 - Tue, Nov 10
PHL
Philadelphia
SOF
Sofia
$714 Roundtrip, found 2 hours ago
$714
Roundtrip
found 2 hours ago
Select Air Canada flight, departing Sun, Nov 1 from Philadelphia to Sofia, returning Tue, Nov 10, priced at $714 found 2 hours ago
United
Sun, Nov 1 - Tue, Nov 10
PHL
Philadelphia
SOF
Sofia
$716 Roundtrip, found 2 hours ago
$716
Roundtrip
found 2 hours ago
Select United flight, departing Sun, Nov 1 from Philadelphia to Sofia, returning Tue, Nov 10, priced at $716 found 2 hours ago
British Airways
Sun, Nov 15 - Mon, Nov 23
PHL
Philadelphia
SOF
Sofia
$739 Roundtrip, found 5 days ago
$739
Roundtrip
found 5 days ago
Select British Airways flight, departing Sun, Nov 15 from Philadelphia to Sofia, returning Mon, Nov 23, priced at $739 found 5 days ago
Austrian Airlines
Mon, Aug 10 - Wed, Aug 26
PHL
Philadelphia
SOF
Sofia
$767 Roundtrip, found 1 hour ago
$767
Roundtrip
found 1 hour ago
Select Austrian Airlines flight, departing Mon, Aug 10 from Philadelphia to Sofia, returning Wed, Aug 26, priced at $767 found 1 hour 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 $881
SOF
Sofia Airport
CheapestClosest
Average driving time to city center11 min
Flights from $881

What you need to know for your flight from Philadelphia Intl. to Sofia

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.

Frequently asked questions

How much does a flight from Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF) cost?
You can find cheap one-way flights from $352 and cheap return flights from $704 Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF) with Expedia. One-way flights usually range from $434 to $3952, and return flights typically cost between $583 and $7740. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF)?
The cheapest month to fly from PHL to SOF is August when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF)?
Enter PHL to SOF and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF)?
Virgin Atlantic is one of the cheapest airlines offering connecting flights from Philadelphia Intl. (PHL) to Sofia (SOF), with return tickets starting from around $953. Virgin Atlantic has a layover in Hartsfield-Jackson Atlanta Intl. (ATL). Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF)?
To find a cheap flight from Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
What is the earliest flight from Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF)?
Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from PHL to SOF. To compare more early flights, use the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF)?
The most popular departure times for flights from Philadelphia, PA (PHL) to Sofia (SOF) are in the late afternoon, from 3pm to 6pm. This time slot captures around 37% of total passenger traffic. Airlines like Lufthansa and Air Canada offer flights during this window, making it a good option for those traveling to Sofia.
How long does it take to fly from Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF)?
A flight from PHL to SOF with a layover takes around 12 hours 30 minutes, with the route covering approximately 4,803 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF)?
Business class seats are offered on the PHL to SOF route. Airlines that offer business class service on this route include:

  • Air Canada
  • American Airlines
  • Delta Air Lines
  • British Airways
  • United Airlines

First class is available with United Airlines.
How do I earn miles on a Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF) flight with Expedia?
It's easy to earn miles on a Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
Is it cheaper to buy a plane ticket from Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF) at the last minute?
Typically, booking a last minute flight from Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF) flight and hotel package?
Securing a Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF) Sofia Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF)?
If you booked your Philadelphia, PA (PHL-Philadelphia Intl.) to Sofia (SOF) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Philadelphia Intl.
Destination airport
Sofia
Airlines serving
Air Canada, Austrian Airlines, British Airways, Lufthansa, Swiss International Air Lines, Turkish Airlines, United
Roundtrip price
$704
Distance
4802 mi

Book with confidence

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 August. 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 $352 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.

 

Philadelphia to Sofia Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

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