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 connection time from Philadelphia to Sofia?

Frankfurt am Main (FRA) has the shortest average layover time for this route: 4h 21m.

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.

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 travel time from Philadelphia to Sofia?

Flights connecting via Frankfurt am Main (FRA) have the shortest average one-way travel time: 13h 05m.

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 December 2025.

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.

$485 Cheap Flights from Philadelphia to Sofia in 2025/26

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3:30 pm - 6:40 pm

PHL

SOF

20h 10m2 stops

6:10 am - 4:00 pm

SOF

PHL

16h 50m1 stop

$485Multiple Airlines

Tue, Mar 31 - Tue, Apr 7

3:30 pm - 6:40 pm

PHL

SOF

20h 10m2 stops

12:55 pm - 2:46 pm

SOF

PHL

32h 51m2 stops

$490Air Canada

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 - 6:40 pm

PHL

SOF

15h 55m2 stops

6:10 am - 12:10 am

SOF

PHL

25h 00m2 stops

$496United Airlines

Tue, Mar 31 - Tue, Apr 7

1:27 pm - 11:10 pm

PHL

SOF

26h 43m2 stops

2:00 pm - 4:00 pm

SOF

PHL

33h 00m1 stop

$507United Airlines

Mon, Apr 20 - Mon, Apr 27

11:45 am - 11:10 pm

PHL

SOF

28h 25m2 stops

12:50 pm - 12:18 pm

SOF

PHL

54h 28m2 stops

$509United Airlines

Mon, Apr 20 - Mon, Apr 27

1:27 pm - 11:10 pm

PHL

SOF

26h 43m2 stops

2:00 pm - 9:23 pm

SOF

PHL

38h 23m2 stops

$517United Airlines

Mon, Apr 20 - Mon, Apr 27

5:35 pm - 6:00 pm

PHL

SOF

17h 25m1 stop

6:10 am - 4:00 pm

SOF

PHL

16h 50m1 stop

$540Lufthansa

Thu, Apr 9 - Tue, Apr 14

3:30 pm - 6:40 pm

PHL

SOF

20h 10m2 stops

2:00 pm - 3:44 pm

SOF

PHL

32h 44m2 stops

$542Air Canada

Thu, Apr 9 - Tue, Apr 14

10:10 am - 10:45 pm

PHL

SOF

29h 35m2 stops

2:35 pm - 10:46 pm

SOF

PHL

15h 11m2 stops

$543United Airlines

Thu, Jan 29 - Thu, Feb 5

SWISS flights from Philadelphia to Sofia

Our best SWISS deals on Philadelphia to Sofia flight tickets

SWISS

Apr 9

PHL10:00 amPhiladelphia

41h 05m

2 stops

SOF10:05 amSofia

Apr 14

SOF12:50 pmSofia

35h 37m

3 stops

PHL5:27 pmPhiladelphia

$668

Find similar

SWISS

Jan 29

PHL1:10 pmPhiladelphia

41h 05m

3 stops

SOF1:15 pmSofia

Feb 5

SOF4:00 pmSofia

36h 36m

3 stops

PHL9:36 pmPhiladelphia

$686

Find similar

SWISS

Apr 20

PHL10:00 amPhiladelphia

41h 05m

2 stops

SOF10:05 amSofia

Apr 27

SOF12:50 pmSofia

35h 37m

3 stops

PHL5:27 pmPhiladelphia

$713

Find similar

United Airlines flights from Philadelphia to Sofia

Our best United Airlines deals on Philadelphia to Sofia flight tickets

United Airlines

Mar 31

PHL7:45 pmPhiladelphia

15h 55m

2 stops

SOF6:40 pmSofia

Apr 7

SOF6:10 amSofia

25h 00m

2 stops

PHL12:10 amPhiladelphia

$496

Find similar

United Airlines

Apr 20

PHL1:27 pmPhiladelphia

26h 43m

2 stops

SOF11:10 pmSofia

Apr 27

SOF2:00 pmSofia

33h 00m

1 stop

PHL4:00 pmPhiladelphia

$507

Find similar

United Airlines

Apr 20

PHL11:45 amPhiladelphia

28h 25m

2 stops

SOF11:10 pmSofia

Apr 27

SOF12:50 pmSofia

54h 28m

2 stops

PHL12:18 pmPhiladelphia

$509

Find similar

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-4:00 pm

1 stop16h 50m

$485

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Tue 3/31

3:30 pm-6:40 pm

2 stops20h 10m

Sofia

Tue 4/7

12:55 pm-2:46 pm

2 stops32h 51m

$490

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 3/31

7:45 pm-6:40 pm

2 stops15h 55m

Sofia

Tue 4/7

6:10 am-12:10 am

2 stops25h 00m

$496

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 4/20

1:27 pm-11:10 pm

2 stops26h 43m

Sofia

Mon 4/27

2:00 pm-4:00 pm

1 stop33h 00m

$507

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 4/20

11:45 am-11:10 pm

2 stops28h 25m

Sofia

Mon 4/27

12:50 pm-12:18 pm

2 stops54h 28m

$509

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Mon 4/20

1:27 pm-11:10 pm

2 stops26h 43m

Sofia

Mon 4/27

2:00 pm-9:23 pm

2 stops38h 23m

$517

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Thu 4/9

5:35 pm-6:00 pm

1 stop17h 25m

Sofia

Tue 4/14

6:10 am-4:00 pm

1 stop16h 50m

$540

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Thu 4/9

3:30 pm-6:40 pm

2 stops20h 10m

Sofia

Tue 4/14

2:00 pm-3:44 pm

2 stops32h 44m

$542

PhiladelphiaSofia

PHL - SOF

PHLSOF

Philadelphia

Thu 1/29

10:10 am-10:45 pm

2 stops29h 35m

Sofia

Thu 2/5

2:35 pm-10:46 pm

2 stops15h 11m

$543

Flights are sorted by cheapest round-trip flights first.

Sorted 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.

What is the cheapest day to depart on your flight to Sofia?

According to our data, Tuesday is the cheapest day to fly to Sofia from Philadelphia. The lowest ticket price found for a Tuesday departure recently was $741. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Philadelphia to Sofia on a Saturday will generally be more expensive and average around $1,491. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Sofia?

In the evening is the cheapest time of day to fly from Philadelphia to Sofia when you can find flight prices for as low as $838. Flying to Sofia in the evening is an ideal time because this is during off-peak travel hours. In the morning is when there is more demand to fly to Sofia, so prices are often more expensive at around $1,318 per ticket.

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	18h 50m
Direct flights	None

The fastest flight from Philadelphia to Sofia takes 18h 50m

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 18h 50m.
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 December 2025.
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 7,632 reviews		Search Lufthansa flights
United Airlines	PriceFrom $540	Free Cancellation	Rating 7.4 9,092 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 $485

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 3/31. 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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SWISS flights from Philadelphia to Sofia

Our best SWISS 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?

What is the cheapest day to depart on your flight to Sofia?

What is the cheapest time of day to depart on your flight 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 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