Which airport is the most popular layover for flights between Philadelphia and Sofia?

Frankfurt am Main (FRA) was the most common stop: 97% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest connection time from Philadelphia to Sofia?

Frankfurt am Main (FRA) has the shortest average layover time for this route: 4h 20m.

Which layover airport offers the lowest fares from Philadelphia to Sofia?

Flights via London (LHR) offer the lowest average round-trip price of $649.

What airlines fly to Sofia?

United Airlines, Lufthansa and Austrian Airlines are the top three most popular airlines that fly to Sofia from Philadelphia according to our data. United Airlines is the first choice among our users, with 36% of people opting to fly with this airline when traveling to Sofia. Keep in mind that there are 12 different airlines that fly to Sofia on a routine basis, so you have a few additional options to choose from.

Which layover airport has the shortest travel time from Philadelphia to Sofia?

Flights connecting via Frankfurt am Main (FRA) have the shortest average one-way travel time: 13h 04m.

What is the cheapest airline that flies from Philadelphia to Sofia?

United Airlines, Lufthansa, and British Airways are the most popular carriers operating from Philadelphia to Sofia

When did momondo last update prices for flights from Philadelphia Airport to Sofia Airport?

Prices for flights from Philadelphia Airport to Sofia Airport are refreshed on a daily basis.

How many operators does momondo search for flights from Philadelphia Airport to Sofia Airport?

The number of operators available for flights from Philadelphia Airport to Sofia Airport is 2 as of February 2026.

How old do you have to be to fly from Philadelphia Airport to Sofia Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Philadelphia Airport to Sofia Airport.

What documentation or ID do you need to fly to Sofia Airport?

The travel and health documents required for your trip to Sofia Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Sofia Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$408 Cheap Flights from Philadelphia to Sofia in 2026

Q: What is the typical price of a round-trip flight between Philadelphia and Sofia?

Prices are currently low for flights on this route. Typical prices usually range from $610 to $684. The lowest price recently found on this route was $487.

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Find the cheapest flights from Philadelphia to Sofia

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One-way

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Enter your travel dates to find the best prices.

3:30 pm - 6:40 pm

PHL

SOF

20h 10m

2 stops

6:10 am - 4:05 pm

SOF

PHL

16h 55m

1 stop

$487Multiple Airlines

Tue, Mar 31 - Tue, Apr 7

10:33 am - 12:10 pm

PHL

SOF

18h 37m

2 stops

6:10 am - 4:05 pm

SOF

PHL

16h 55m

1 stop

$489United Airlines

Mon, Apr 13 - Tue, Apr 21

3:30 pm - 6:40 pm

PHL

SOF

20h 10m

2 stops

6:10 am - 2:46 pm

SOF

PHL

39h 36m

2 stops

$492Air Canada

Tue, Mar 31 - Tue, Apr 7

4:55 pm - 11:00 pm

PHL

SOF

47h 05m

2 stops

6:30 am - 4:05 pm

SOF

PHL

16h 35m

1 stop

$494United Airlines

Sat, Apr 25 - Thu, May 7

5:40 pm - 6:00 pm

PHL

SOF

17h 20m

1 stop

6:10 am - 4:05 pm

SOF

PHL

16h 55m

1 stop

$495Lufthansa

Tue, Mar 31 - Tue, Apr 7

4:25 pm - 12:10 pm

PHL

SOF

36h 45m

2 stops

6:10 am - 2:46 pm

SOF

PHL

15h 36m

2 stops

$496Air Canada

Sun, Apr 12 - Tue, Apr 21

4:55 pm - 11:00 pm

PHL

SOF

47h 05m

2 stops

6:30 am - 2:48 pm

SOF

PHL

15h 18m

2 stops

$498United Airlines

Sat, Apr 25 - Thu, May 7

8:02 pm - 6:20 pm

PHL

SOF

39h 18m

2 stops

6:10 am - 12:16 am

SOF

PHL

24h 06m

2 stops

$499United Airlines

Sat, Feb 28 - Wed, Mar 11

6:04 am - 11:00 pm

PHL

SOF

33h 56m

2 stops

6:10 am - 4:05 pm

SOF

PHL

16h 55m

1 stop

$501United Airlines

Sun, Apr 12 - Tue, Apr 21

9:15 am - 12:10 pm

PHL

SOF

19h 55m

2 stops

7:00 pm - 4:05 pm

SOF

PHL

28h 05m

1 stop

$504Multiple Airlines

Mon, Mar 30 - Mon, Apr 6

Lufthansa flights from Philadelphia to Sofia

Our best Lufthansa deals on Philadelphia to Sofia flight tickets

Lufthansa

Mar 31

PHL5:40 pmPhiladelphia

17h 20m

1 stop

SOF6:00 pmSofia

Apr 7

SOF6:10 amSofia

16h 55m

1 stop

PHL4:05 pmPhiladelphia

$495

Lufthansa

May 6

PHL5:40 pmPhiladelphia

17h 25m

1 stop

SOF6:05 pmSofia

Aug 26

SOF7:00 pmSofia

28h 05m

1 stop

PHL4:05 pmPhiladelphia

$545

Lufthansa

Mar 15

PHL6:40 pmPhiladelphia

17h 20m

1 stop

SOF6:00 pmSofia

Mar 22

SOF6:10 amSofia

16h 55m

1 stop

PHL5:05 pmPhiladelphia

$595

United Airlines flights from Philadelphia to Sofia

Our best United Airlines deals on Philadelphia to Sofia flight tickets

United Airlines

Apr 13

PHL10:33 amPhiladelphia

18h 37m

2 stops

SOF12:10 pmSofia

Apr 21

SOF6:10 amSofia

16h 55m

1 stop

PHL4:05 pmPhiladelphia

$489

United Airlines

Apr 25

PHL4:55 pmPhiladelphia

47h 05m

2 stops

SOF11:00 pmSofia

May 7

SOF6:30 amSofia

16h 35m

1 stop

PHL4:05 pmPhiladelphia

$494

United Airlines

Apr 25

PHL4:55 pmPhiladelphia

47h 05m

2 stops

SOF11:00 pmSofia

May 7

SOF6:30 amSofia

15h 18m

2 stops

PHL2:48 pmPhiladelphia

$498

Fly from

Fly to

Route

Depart

Return

Price

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 3/31

3:30 pm-6:40 pm

2 stops20h 10m

Sofia

Tue 4/7

6:10 am-4:05 pm

1 stop16h 55m

$487

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 4/13

10:33 am-12:10 pm

2 stops18h 37m

Sofia

Tue 4/21

6:10 am-4:05 pm

1 stop16h 55m

$489

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 3/31

3:30 pm-6:40 pm

2 stops20h 10m

Sofia

Tue 4/7

6:10 am-2:46 pm

2 stops39h 36m

$492

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sat 4/25

4:55 pm-11:00 pm

2 stops47h 05m

Sofia

Thu 5/7

6:30 am-4:05 pm

1 stop16h 35m

$494

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 3/31

5:40 pm-6:00 pm

1 stop17h 20m

Sofia

Tue 4/7

6:10 am-4:05 pm

1 stop16h 55m

$495

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sun 4/12

4:25 pm-12:10 pm

2 stops36h 45m

Sofia

Tue 4/21

6:10 am-2:46 pm

2 stops15h 36m

$496

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sat 4/25

4:55 pm-11:00 pm

2 stops47h 05m

Sofia

Thu 5/7

6:30 am-2:48 pm

2 stops15h 18m

$498

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sat 2/28

8:02 pm-6:20 pm

2 stops39h 18m

Sofia

Wed 3/11

6:10 am-12:16 am

2 stops24h 06m

$499

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sun 4/12

6:04 am-11:00 pm

2 stops33h 56m

Sofia

Tue 4/21

6:10 am-4:05 pm

1 stop16h 55m

$501

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 3/30

9:15 am-12:10 pm

2 stops19h 55m

Sofia

Mon 4/6

7:00 pm-4:05 pm

1 stop28h 05m

$504

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 resultsSorted by cheapest first

How to get the cheapest flight ticket from Philadelphia to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Layovers

What is the typical price of a round-trip flight between Philadelphia and Sofia?

What is the cheapest month to fly to Sofia?

The cheapest month to fly to Sofia from Philadelphia is in October. Flight prices, which tend to average around $518, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of October, then book flights to Sofia from Philadelphia during November instead. Flights to Sofia in November, while not as cheap as those in October, still average around $540.

Can stopping save me money on Philadelphia to Sofia flights?

You could potentially save up to 25% on your flight if you consider stops on a Philadelphia to Sofia flight.

When to book flights from Philadelphia to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from Philadelphia to Sofia according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Philadelphia to Sofia (PHL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Philadelphia to Sofia

Fastest flight time	17h 35m
Direct flights	None

The fastest flight from Philadelphia to Sofia takes 17h 35m

There are no direct flights from Philadelphia to Sofia. There are no popular flight routes from Philadelphia to Sofia.

Search flight deals

How far is Philadelphia to Sofia by plane?
Sofia is 4789.3 mi away from Philadelphia. In terms of flight time, this usually takes a little over 17h 35m.
When did momondo last update prices for flights from Philadelphia Airport to Sofia Airport?
Prices for flights from Philadelphia Airport to Sofia Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Philadelphia Airport to Sofia Airport?
The number of operators available for flights from Philadelphia Airport to Sofia Airport is 2 as of February 2026.
How old do you have to be to fly from Philadelphia Airport to Sofia Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Philadelphia Airport to Sofia Airport.
What documentation or ID do you need to fly to Sofia Airport?
The travel and health documents required for your trip to Sofia Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Sofia Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from Philadelphia to Sofia?
Based on momondo bookings for flights between Philadelphia and Sofia, the leading airline is Lufthansa, making up 76% of the total bookings. Other popular airlines include United Airlines with 24%.

Best airlines flying from Philadelphia to Sofia

Compare and see reviews for airlines that fly from Philadelphia to Sofia with momondo

Airline	Rating	Free Cancellation	Price
Lufthansa	PriceFrom $511	Free Cancellation	Rating 6.8 7,786 reviews		Search Lufthansa flights
United Airlines	PriceFrom $540	Free Cancellation	Rating 7.4 9,308 reviews		Search United Airlines flights

Bansko

Borovets

Velingrad

Sandanski

Why use momondo?

Why should I use momondo to find a flight deal from Philadelphia to Sofia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Philadelphia to Sofia. momondo saves you time and could save you money on your trip.

Can I find flights from Philadelphia to Sofia with flexible booking policies on momondo?

momondo does allow users to show only those flights to Sofia from Philadelphia which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Philadelphia to Sofia?

Once you have performed a search for Philadelphia to Sofia flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Philadelphia to Sofia right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Sofia from Philadelphia. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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Cheap flights from Philadelphia to Sofia from $408

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Philadelphia to Sofia departing on 4/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Lufthansa flights from Philadelphia to Sofia

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How to get the cheapest flight ticket from Philadelphia to Sofia

What is the typical price of a round-trip flight between Philadelphia and Sofia?

What is the cheapest month to fly to Sofia?

Can stopping save me money on Philadelphia to Sofia flights?

What is the cheapest airline that flies from Philadelphia to Sofia?

What airlines fly to Sofia?

Which airport is the most popular layover for flights between Philadelphia and Sofia?

Which layover airport offers the lowest fares from Philadelphia to Sofia?

Which layover airport has the shortest travel time from Philadelphia to Sofia?

Which layover airport has the shortest connection time from Philadelphia to Sofia?

When to book flights from Philadelphia to Sofia

Cheap Philadelphia to Sofia (PHL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Philadelphia to Sofia

Fastest flight time

Direct flights

Best airlines flying from Philadelphia to Sofia

Compare and see reviews for airlines that fly from Philadelphia to Sofia with momondo

Traveling to a place near Sofia?

Why use momondo?

Why should I use momondo to find a flight deal from Philadelphia to Sofia?

Can I find flights from Philadelphia to Sofia with flexible booking policies on momondo?

How can momondo help me find flights from Philadelphia to Sofia?

I’m not ready to book a flight from Philadelphia to Sofia right now. Can momondo alert me if prices change?

An easier way to manage your Sofia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Bulgaria

Fly your favorite airline to Sofia

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Cabin classes currently available on flights to Sofia

List of cabin classes available on flights landing in Sofia. Availability may vary depending on flight origin and airline.

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