$321 Flights from Philadelphia International (PHL) to Sofia (SOF)

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Flight deals from Philadelphia International to Sofia

Looking for a cheap last-minute deal or the best round-trip flight from Philadelphia International Airport to Sofia Airport? If you want to travel next month, round-trip fares start from $748. Find the lowest prices on one-way and round-trip tickets right here.

Find the cheapest month to fly from Philadelphia International to Sofia from $321 one-way

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Philadelphia International to Sofia flights are currently cheapest in July.

Philadelphia International to Sofia: Alternative routes

Compare routes from Philadelphia International to Sofia below. You may find an airport to fly into that's cheaper, faster, or easier than Sofia.

Philadelphia to Sofia: Flight information

The things to know before you go.
Cheapest flight found$321
Cheapest month to flyJuly

Finding cheap flights from Philadelphia International to Sofia: Frequently asked questions

The best price we found for a round-trip flight from Philadelphia International to Sofia is $685. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Philadelphia International to Sofia. But we found flights with one or more stops from $685.
There are no flights flying from Philadelphia International to Sofia, as of June 2026.
The cheapest month to fly from Philadelphia International to Sofia is usually November.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Philadelphia International Airport to Sofia Airport on Tuesday, November 3, 2026.
No airlines currently offer direct flights between Philadelphia International Airport and Sofia Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Sofia but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to Sofia is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Air Canada offers the cheapest flight tickets to Sofia.

Traveling from Philadelphia International Airport (PHL) to Sofia Airport (SOF): what you need to know

  • Sofia is seven hours ahead of Philadelphia and follows the UTC+2 timezone.

  • Your PHL to SOF flight won't wait if you're running late, so get to the airport on time. Arrive up to one hour in advance for domestic flights and two hours ahead when you're traveling internationally.

  • You'll likely experience longer queues during popular months like August. Arriving up to four hours ahead of an international flight and two hours for a domestic departure will help ensure a smooth travel experience.

  • If you'd like to include a stop along the way, just uncheck 'Direct flights only' when searching for your ticket from Philadelphia International Airport to Sofia Airport. These are the top stopovers between PHL and SOF:

    • London Heathrow Airport

    • Athens International Airport

    • Zurich Airport

Handy information about Philadelphia International Airport (PHL)

  • The address for PHL is 8500 Essington Ave.

  • Of all flights leaving Philadelphia International Airport, 77% arrive as scheduled at their destination.

  • Central Philadelphia to Philadelphia International Airport is around 11 miles. Depending on traffic, it'll take you about 20 minutes to get there if you're driving, catching a cab or ride-sharing.

  • The trip on public transport takes roughly 30 minutes.

  • Searching for a handy hotel close to PHL? If you're boarding an early flight from Philadelphia International Airport to Sofia Airport, these stays will have you moments from your check-in counter:

Arriving at Sofia Airport (SOF)

Getting from Sofia Airport (SOF) to central Sofia

  • Sofia Airport is approximately 6 miles from the center of Sofia. The drive time takes around 25 minutes.

  • If you're traveling on public transport, expect a journey of roughly 30 minutes.

When to fly to Sofia Airport (SOF)

  • August is the busiest month for flights from Philadelphia International Airport to Sofia Airport. For smaller crowds, head to Sofia in March.

  • When reserving your flight from Philadelphia International Airport to Sofia Airport, consider the type of weather you enjoy. August is the warmest month in Sofia, with the temperature ranging from 55ºF to 90ºF.

  • Search for cheap tickets from PHL to SOF in January if you like cooler conditions. Temperatures are at their lowest around then, ranging between 12ºF and 45ºF on average.

Explore more of Bulgaria

  • Plovdiv is just one of the many cities in Bulgaria waiting to be discovered once you've seen Sofia. Around 80 miles away to the south-east, check out popular attractions including Plovdiv Roman Theatre, Municipal Institute "Ancient Plovdiv" and Museum Center for Contemporary History.

  • If there's time to check out another well-known destination in Bulgaria, head for Varna, about 240 miles east of Sofia. Sahara beach, Museum of Natural History and Sea Garden are key reasons to visit.

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.