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

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

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 18m.

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 37% 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 airport is the most popular layover for flights between Philadelphia and Sofia?

Frankfurt am Main (FRA) was the most common stop: 98% 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.

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 March 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.

$276 Cheap Flights from Philadelphia to Sofia in 2026

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Find the cheapest flights from Philadelphia to Sofia

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

9:15 am - 12:10 pm

PHL

SOF

19h 55m

2 stops

6:10 am - 2:46 pm

SOF

PHL

15h 36m

2 stops

$487Multiple Airlines

Tue, Apr 14 - Tue, Apr 21

11:08 am - 2:00 pm

PHL

SOF

19h 52m

2 stops

7:00 am - 9:23 pm

SOF

PHL

21h 23m

2 stops

$515Multiple Airlines

Tue, Mar 31 - Tue, Apr 7

4:25 pm - 12:10 pm

PHL

SOF

36h 45m

2 stops

2:20 pm - 2:46 pm

SOF

PHL

31h 26m

2 stops

$516United Airlines

Mon, Apr 13 - Mon, Apr 20

4:25 pm - 6:10 pm

PHL

SOF

18h 45m

2 stops

6:20 am - 2:46 pm

SOF

PHL

15h 26m

2 stops

$528Multiple Airlines

Sun, Apr 19 - Wed, Apr 29

10:00 am - 10:50 pm

PHL

SOF

29h 50m

2 stops

6:10 am - 2:10 pm

SOF

PHL

39h 00m

2 stops

$531United Airlines

Tue, Apr 14 - Tue, Apr 21

11:32 am - 12:10 pm

PHL

SOF

17h 38m

2 stops

6:10 am - 9:33 pm

SOF

PHL

22h 23m

2 stops

$542United Airlines

Mon, May 11 - Tue, Jun 2

10:38 am - 6:10 pm

PHL

SOF

24h 32m

2 stops

6:20 am - 9:33 pm

SOF

PHL

22h 13m

2 stops

$555United Airlines

Sun, May 10 - Wed, Jun 3

4:20 pm - 12:10 pm

PHL

SOF

36h 50m

2 stops

6:10 am - 9:33 pm

SOF

PHL

22h 23m

2 stops

$576United Airlines

Sat, May 16 - Tue, Jun 2

10:00 pm - 8:30 pm

PHL

SOF

39h 30m

2 stops

8:10 pm - 4:40 pm

SOF

PHL

27h 30m

1 stop

$578British Airways

Mon, Apr 13 - Mon, Apr 20

6:45 pm - 7:20 pm

PHL

SOF

17h 35m

1 stop

9:25 pm - 4:40 pm

SOF

PHL

26h 15m

1 stop

$596British Airways

Sun, Apr 19 - Wed, Apr 29

United Airlines flights from Philadelphia to Sofia

Our best United Airlines deals on Philadelphia to Sofia flight tickets

United Airlines

Apr 13

PHL4:25 pmPhiladelphia

36h 45m

2 stops

SOF12:10 pmSofia

Apr 20

SOF2:20 pmSofia

31h 26m

2 stops

PHL2:46 pmPhiladelphia

$516

United Airlines

Apr 14

PHL10:00 amPhiladelphia

29h 50m

2 stops

SOF10:50 pmSofia

Apr 21

SOF6:10 amSofia

39h 00m

2 stops

PHL2:10 pmPhiladelphia

$531

United Airlines

May 11

PHL11:32 amPhiladelphia

17h 38m

2 stops

SOF12:10 pmSofia

Jun 3

SOF6:20 amSofia

22h 13m

2 stops

PHL9:33 pmPhiladelphia

$542

British Airways flights from Philadelphia to Sofia

Our best British Airways deals on Philadelphia to Sofia flight tickets

British Airways

Apr 13

PHL10:00 pmPhiladelphia

39h 30m

2 stops

SOF8:30 pmSofia

Apr 20

SOF8:10 pmSofia

27h 30m

1 stop

PHL4:40 pmPhiladelphia

$578

British Airways

Apr 19

PHL6:45 pmPhiladelphia

17h 35m

1 stop

SOF7:20 pmSofia

Apr 29

SOF9:25 pmSofia

26h 15m

1 stop

PHL4:40 pmPhiladelphia

$596

British Airways

Apr 19

PHL5:12 pmPhiladelphia

19h 08m

2 stops

SOF7:20 pmSofia

Apr 29

SOF9:25 pmSofia

26h 15m

1 stop

PHL4:40 pmPhiladelphia

$605

Fly from

Fly to

Route

Depart

Return

Price

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 4/14

9:15 am-12:10 pm

2 stops19h 55m

Sofia

Tue 4/21

6:10 am-2:46 pm

2 stops15h 36m

$487

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 3/31

11:08 am-2:00 pm

2 stops19h 52m

Sofia

Tue 4/7

7:00 am-9:23 pm

2 stops21h 23m

$515

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 4/13

4:25 pm-12:10 pm

2 stops36h 45m

Sofia

Mon 4/20

2:20 pm-2:46 pm

2 stops31h 26m

$516

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sun 4/19

4:25 pm-6:10 pm

2 stops18h 45m

Sofia

Wed 4/29

6:20 am-2:46 pm

2 stops15h 26m

$528

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 4/14

10:00 am-10:50 pm

2 stops29h 50m

Sofia

Tue 4/21

6:10 am-2:10 pm

2 stops39h 00m

$531

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 5/11

11:32 am-12:10 pm

2 stops17h 38m

Sofia

Tue 6/2

6:10 am-9:33 pm

2 stops22h 23m

$542

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sun 5/10

10:38 am-6:10 pm

2 stops24h 32m

Sofia

Wed 6/3

6:20 am-9:33 pm

2 stops22h 13m

$555

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sat 5/16

4:20 pm-12:10 pm

2 stops36h 50m

Sofia

Tue 6/2

6:10 am-9:33 pm

2 stops22h 23m

$576

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 4/13

10:00 pm-8:30 pm

2 stops39h 30m

Sofia

Mon 4/20

8:10 pm-4:40 pm

1 stop27h 30m

$578

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Sun 4/19

6:45 pm-7:20 pm

1 stop17h 35m

Sofia

Wed 4/29

9:25 pm-4:40 pm

1 stop26h 15m

$596

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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 November. Flight prices, which tend to average around $540, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of November, then book flights to Sofia from Philadelphia during March instead. Flights to Sofia in March, while not as cheap as those in November, still average around $546.

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 45m
Direct flights	None

The fastest flight from Philadelphia to Sofia takes 17h 45m

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 45m.
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 March 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 73% of the total bookings. Other popular airlines include United Airlines with 27%.

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 7,818 reviews		Search Lufthansa flights
United Airlines	PriceFrom $540	Free Cancellation	Rating 7.4 9,375 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.