How does KAYAK find such low prices on flights from Pennsylvania to Sofia?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Pennsylvania to Sofia.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Pennsylvania to Sofia?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sofia from Pennsylvania is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Pennsylvania to Sofia?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Sofia with an airline and back to Pennsylvania with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Pennsylvania to Sofia?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Sofia from Pennsylvania up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

$361 CHEAP FLIGHTS from Pennsylvania to Sofia

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Flight Deals

Cheap Flights from Pennsylvania to Sofia

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Recent round-trip flight deals from Pennsylvania to Sofia

Sun, Nov 29 - Tue, Dec 15

5:40 pm - 1:25 pmPHL Philadelphia-SOF Sofia

12h 45m1 stop Frankfurt am Main

6:25 am - 4:05 pmSOF Sofia-PHL Philadelphia

16h 40m1 stop Frankfurt am Main

$690Lufthansa

Sat, Feb 20 - Fri, Feb 26

3:20 pm - 2:15 pmPHL Philadelphia-SOF Sofia

39h 55m2 stops Montreal Pierre Elliott Trudeau Intl Zurich

6:25 am - 4:21 pmSOF Sofia-PHL Philadelphia

40h 56m2 stops Frankfurt am Main Toronto Pearson Intl

$707Multiple Airlines

Sun, Nov 29 - Tue, Dec 15

5:40 pm - 10:55 pmPHL Philadelphia-SOF Sofia

22h 15m2 stops Frankfurt am Main Munich Franz Josef Strauss

6:25 am - 4:05 pmSOF Sofia-PHL Philadelphia

16h 40m1 stop Frankfurt am Main

$715Lufthansa

Tue, Apr 20 - Thu, Apr 22

1:00 pm - 12:20 pmPHL Philadelphia-SOF Sofia

16h 20m2 stops Chicago O'Hare Intl Munich Franz Josef Strauss

6:20 am - 4:00 pmSOF Sofia-PHL Philadelphia

16h 40m1 stop Frankfurt am Main

$723United Airlines

Tue, Apr 20 - Thu, Apr 22

10:15 am - 12:20 pmPHL Philadelphia-SOF Sofia

19h 05m2 stops Washington, D.C. Dulles Intl Munich Franz Josef Strauss

6:20 am - 2:41 pmSOF Sofia-PHL Philadelphia

15h 21m2 stops Frankfurt am Main Montreal Pierre Elliott Trudeau Intl

$726United Airlines

Mon, Mar 1 - Thu, Mar 4

3:10 pm - 1:25 pmPIT Pittsburgh-SOF Sofia

15h 15m2 stops Washington, D.C. Dulles Intl Frankfurt am Main

6:25 am - 6:35 pmSOF Sofia-PIT Pittsburgh

19h 10m2 stops Frankfurt am Main Toronto Pearson Intl

$730United Airlines

Sun, Nov 29 - Tue, Dec 15

5:40 pm - 10:55 pmPHL Philadelphia-SOF Sofia

22h 15m2 stops Frankfurt am Main Munich Franz Josef Strauss

6:00 am - 4:05 pmSOF Sofia-PHL Philadelphia

17h 05m2 stops Munich Franz Josef Strauss Frankfurt am Main

$732Lufthansa

Tue, Apr 20 - Thu, Apr 22

3:20 pm - 6:45 pmPHL Philadelphia-SOF Sofia

20h 25m2 stops Montreal Pierre Elliott Trudeau Intl Munich Franz Josef Strauss

1:05 pm - 2:41 pmSOF Sofia-PHL Philadelphia

32h 36m2 stops Munich Franz Josef Strauss Montreal Pierre Elliott Trudeau Intl

$736Air Canada

Sun, Dec 13 - Sun, Dec 20

5:40 pm - 1:25 pmPHL Philadelphia-SOF Sofia

12h 45m1 stop Frankfurt am Main

6:25 am - 4:05 pmSOF Sofia-PHL Philadelphia

16h 40m1 stop Frankfurt am Main

$763Lufthansa

Sun, Dec 13 - Sun, Dec 20

5:40 pm - 1:25 pmPHL Philadelphia-SOF Sofia

12h 45m1 stop Frankfurt am Main

6:45 pm - 4:05 pmSOF Sofia-PHL Philadelphia

52h 20m2 stops Vienna Intl Frankfurt am Main

$778Multiple Airlines

Recent last minute flight deals from Pennsylvania to Sofia

Sat, Oct 31 - Mon, Nov 9

6:46 pm - 11:00 pmPHL Philadelphia-SOF Sofia

46h 14m2 stops Chicago O'Hare Intl Frankfurt am Main

7:55 am - 4:05 pmSOF Sofia-PHL Philadelphia

39h 10m2 stops Vienna Intl Frankfurt am Main

$757United Airlines

Sat, Oct 31 - Mon, Nov 9

6:46 pm - 11:00 pmPHL Philadelphia-SOF Sofia

46h 14m2 stops Chicago O'Hare Intl Frankfurt am Main

2:10 pm - 4:05 pmSOF Sofia-PHL Philadelphia

32h 55m1 stop Frankfurt am Main

$762United Airlines

Sun, Nov 1 - Sat, Nov 7

9:45 am - 11:00 pmPHL Philadelphia-SOF Sofia

30h 15m2 stops Chicago O'Hare Intl Frankfurt am Main

2:00 pm - 4:21 pmSOF Sofia-PHL Philadelphia

57h 21m2 stops Munich Franz Josef Strauss Toronto Pearson Intl

$796United Airlines

Sun, Nov 1 - Sat, Nov 7

10:54 am - 11:00 pmPHL Philadelphia-SOF Sofia

29h 06m2 stops Chicago O'Hare Intl Frankfurt am Main

2:10 pm - 4:05 pmSOF Sofia-PHL Philadelphia

32h 55m1 stop Frankfurt am Main

$807United Airlines

Sun, Nov 1 - Sat, Nov 7

5:40 pm - 11:00 pmPHL Philadelphia-SOF Sofia

22h 20m1 stop Frankfurt am Main

2:10 pm - 4:05 pmSOF Sofia-PHL Philadelphia

32h 55m1 stop Frankfurt am Main

$856Lufthansa

Sat, Oct 31 - Mon, Nov 9

7:25 pm - 7:40 pmPHL Philadelphia-SOF Sofia

18h 15m1 stop Zurich

5:15 pm - 4:15 pmSOF Sofia-PHL Philadelphia

30h 00m1 stop London Heathrow

$1,181Multiple Airlines

Sun, Nov 1 - Sat, Nov 7

5:40 pm - 11:55 pmPHL Philadelphia-SOF Sofia

23h 15m2 stops Frankfurt am Main Vienna Intl

11:15 am - 2:50 pmSOF Sofia-PHL Philadelphia

34h 35m3 stops Athens Eleftherios V. Cairo Doha Hamad Intl

$1,291Multiple Airlines

Sun, Nov 1 - Sat, Nov 7

5:40 pm - 1:55 amPHL Philadelphia-SOF Sofia

25h 15m3 stops Frankfurt am Main Brussels Bruxelles-National Nice Côte d'Azur

11:15 am - 2:50 pmSOF Sofia-PHL Philadelphia

34h 35m3 stops Athens Eleftherios V. Cairo Doha Hamad Intl

$1,319Multiple Airlines

Sat, Oct 31 - Mon, Nov 9

9:15 am - 1:25 pmPHL Philadelphia-SOF Sofia

22h 10m2 stops Toronto Pearson Intl Frankfurt am Main

6:00 am - 4:21 pmSOF Sofia-PHL Philadelphia

17h 21m3 stops Munich Franz Josef Strauss Frankfurt am Main Toronto Pearson Intl

$1,376Air Canada

Sat, Oct 31 - Sat, Nov 7

9:45 am - 10:55 pmPHL Philadelphia-SOF Sofia

31h 10m2 stops Chicago O'Hare Intl Munich Franz Josef Strauss

7:55 am - 11:25 pmSOF Sofia-PHL Philadelphia

22h 30m2 stops Vienna Intl Washington, D.C. Dulles Intl

$1,940Multiple Airlines

Useful Info

Low season	January
High season	September
Cheapest flight	$361

Best time to beat the crowds but there is an average 232% increase in price.

Most popular time to fly and prices are also 31% lower on average.

Flight from Philadelphia to Sofia

How does KAYAK find such low prices on flights from Pennsylvania to Sofia?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Pennsylvania to Sofia.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Pennsylvania to Sofia?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sofia from Pennsylvania is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Pennsylvania to Sofia?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Sofia with an airline and back to Pennsylvania with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Pennsylvania to Sofia?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Sofia from Pennsylvania up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.