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 05m.

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

Frankfurt am Main (FRA) was the most common stop: 96% 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 21m.

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?

Lufthansa, United Airlines and Austrian Airlines are the top three most popular airlines that fly to Sofia from Philadelphia according to our data. Lufthansa 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.

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

Air France and United Airlines 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 January 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.

$474 Cheap Flights from Philadelphia to Sofia in 2026

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Find the cheapest flights from Philadelphia to Sofia

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One-way

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Cheap round-trip flights

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11:36 am - 10:20 am

PHL

SOF

15h 44m2 stops

6:20 am - 4:00 pm

SOF

PHL

16h 40m1 stop

$474Multiple Airlines

Tue, Apr 14 - Wed, Apr 29

5:35 pm - 1:05 pm

PHL

SOF

12h 30m1 stop

6:20 am - 4:00 pm

SOF

PHL

16h 40m1 stop

$484Lufthansa

Tue, Apr 14 - Wed, Apr 29

3:30 pm - 6:40 pm

PHL

SOF

20h 10m2 stops

6:10 am - 4:00 pm

SOF

PHL

16h 50m1 stop

$486Multiple Airlines

Tue, Mar 31 - Tue, Apr 7

5:35 pm - 6:00 pm

PHL

SOF

17h 25m1 stop

6:10 am - 4:00 pm

SOF

PHL

16h 50m1 stop

$491Lufthansa

Tue, Mar 31 - Tue, Apr 7

7:45 pm - 11:10 pm

PHL

SOF

20h 25m2 stops

1:50 pm - 10:43 pm

SOF

PHL

15h 53m2 stops

$493United Airlines

Tue, Apr 14 - Wed, Apr 29

5:40 pm - 1:50 pm

PHL

SOF

13h 10m1 stop

6:00 am - 2:50 pm

SOF

PHL

15h 50m2 stops

$534Multiple Airlines

Thu, Jan 29 - Thu, Feb 5

10:10 am - 10:45 pm

PHL

SOF

29h 35m2 stops

2:35 pm - 3:24 pm

SOF

PHL

31h 49m2 stops

$543United Airlines

Thu, Jan 29 - Thu, Feb 5

7:50 am - 11:55 pm

PHL

SOF

33h 05m2 stops

6:00 am - 2:50 pm

SOF

PHL

15h 50m2 stops

$546Multiple Airlines

Thu, Jan 29 - Thu, Feb 5

12:29 pm - 2:05 pm

PHL

SOF

18h 36m2 stops

7:00 am - 6:52 pm

SOF

PHL

18h 52m2 stops

$551KLM

Fri, Feb 13 - Fri, Feb 20

7:50 am - 1:35 pm

PHL

SOF

22h 45m2 stops

2:15 pm - 10:46 pm

SOF

PHL

15h 31m2 stops

$558Air Canada

Fri, Feb 6 - Tue, Feb 10

Lufthansa flights from Philadelphia to Sofia

Our best Lufthansa deals on Philadelphia to Sofia flight tickets

Lufthansa

Apr 14

PHL5:35 pmPhiladelphia

12h 30m

1 stop

SOF1:05 pmSofia

Apr 29

SOF6:20 amSofia

16h 40m

1 stop

PHL4:00 pmPhiladelphia

$484

Find similar

Lufthansa

May 29

PHL5:35 pmPhiladelphia

12h 30m

1 stop

SOF1:05 pmSofia

Jun 15

SOF6:20 amSofia

16h 40m

1 stop

PHL4:00 pmPhiladelphia

$812

Find similar

United Airlines flights from Philadelphia to Sofia

Our best United Airlines deals on Philadelphia to Sofia flight tickets

United Airlines

Apr 14

PHL7:45 pmPhiladelphia

20h 25m

2 stops

SOF11:10 pmSofia

Apr 29

SOF1:50 pmSofia

15h 53m

2 stops

PHL10:43 pmPhiladelphia

$493

Find similar

United Airlines

Jan 29

PHL10:10 amPhiladelphia

29h 35m

2 stops

SOF10:45 pmSofia

Feb 5

SOF2:35 pmSofia

31h 49m

2 stops

PHL3:24 pmPhiladelphia

$543

Find similar

United Airlines

Jun 20

PHL7:00 amPhiladelphia

23h 00m

2 stops

SOF1:00 pmSofia

Jul 4

SOF12:55 pmSofia

17h 35m

2 stops

PHL11:30 pmPhiladelphia

$989

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 4/14

11:36 am-10:20 am

2 stops15h 44m

Sofia

Wed 4/29

6:20 am-4:00 pm

1 stop16h 40m

$474

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 4/14

5:35 pm-1:05 pm

1 stop12h 30m

Sofia

Wed 4/29

6:20 am-4:00 pm

1 stop16h 40m

$484

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 3/31

3:30 pm-6:40 pm

2 stops20h 10m

Sofia

Tue 4/7

6:10 am-4:00 pm

1 stop16h 50m

$486

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 3/31

5:35 pm-6:00 pm

1 stop17h 25m

Sofia

Tue 4/7

6:10 am-4:00 pm

1 stop16h 50m

$491

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 4/14

7:45 pm-11:10 pm

2 stops20h 25m

Sofia

Wed 4/29

1:50 pm-10:43 pm

2 stops15h 53m

$493

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Thu 1/29

5:40 pm-1:50 pm

1 stop13h 10m

Sofia

Thu 2/5

6:00 am-2:50 pm

2 stops15h 50m

$534

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Thu 1/29

10:10 am-10:45 pm

2 stops29h 35m

Sofia

Thu 2/5

2:35 pm-3:24 pm

2 stops31h 49m

$543

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Thu 1/29

7:50 am-11:55 pm

2 stops33h 05m

Sofia

Thu 2/5

6:00 am-2:50 pm

2 stops15h 50m

$546

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Fri 2/13

12:29 pm-2:05 pm

2 stops18h 36m

Sofia

Fri 2/20

7:00 am-6:52 pm

2 stops18h 52m

$551

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Fri 2/6

7:50 am-1:35 pm

2 stops22h 45m

Sofia

Tue 2/10

2:15 pm-10:46 pm

2 stops15h 31m

$558

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 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 8% 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	15h 44m
Direct flights	None

The fastest flight from Philadelphia to Sofia takes 15h 44m

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 15h 44m.
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 January 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 77% of the total bookings. Other popular airlines include United Airlines with 23%.

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 7,675 reviews		Search Lufthansa flights
United Airlines	PriceFrom $540	Free Cancellation	Rating 7.4 9,127 reviews		Search United Airlines flights

Bansko

Borovets

Velingrad

Sandanski

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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 $474

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Philadelphia to Sofia departing on 4/14. 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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Filter for what you want

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Find the cheapest flights from Philadelphia to Sofia

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Lufthansa flights from Philadelphia to Sofia

Our best Lufthansa deals on Philadelphia to Sofia flight tickets

United Airlines flights from Philadelphia to Sofia

Our best United Airlines deals on Philadelphia to Sofia flight tickets

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How to get the cheapest flight ticket from Philadelphia to Sofia

What is the cheapest month to fly to Sofia?

Can stopping save me money on Philadelphia to Sofia flights?

You could potentially save up to 8% on your flight if you consider stops on a Philadelphia to Sofia flight.

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

Air France and United Airlines are the most popular carriers operating from Philadelphia to Sofia

What airlines fly to Sofia?

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

Frankfurt am Main (FRA) was the most common stop: 96% of momondo users choosing 1-stop flights on this route connected there.

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

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

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 05m.

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 21m.

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

How far is Philadelphia to Sofia by plane?

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

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

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

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

What is the most popular airline from Philadelphia to Sofia?

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

Airlines are sorted and displayed according to clicks in the past 7 days on momondo