$573 Find Cheap Flights from Bulgaria to Philadelphia

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight to Philadelphia departing on 9/4. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Philadelphia

 
These are the airlines KAYAK users have selected most often from within our search results for flights to Philadelphia, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results for flights to Philadelphia, as well as popular online travel agencies
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Cheap Flights from Bulgaria to Philadelphia

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Bulgaria to Philadelphia that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Bulgaria to Philadelphia

Thu, Sep 4 - Mon, Sep 8
Lufthansa Logo
6:15 am - 4:00 pmSOF-PHL
16h 45m1 stop
Lufthansa Logo
5:35 pm - 5:50 pmPHL-SOF
17h 15m1 stop
$573Lufthansa
Find Deal
Wed, Sep 17 - Mon, Sep 22
Lufthansa Logo
6:15 am - 4:00 pmSOF-PHL
16h 45m1 stop
Lufthansa Logo
5:35 pm - 5:50 pmPHL-SOF
17h 15m1 stop
$576Lufthansa
Find Deal
Mon, Sep 8 - Mon, Sep 15
United Airlines Logo
6:15 am - 10:08 pmSOF-PHL
22h 53m2 stops
United Airlines Logo
5:35 pm - 5:50 pmPHL-SOF
17h 15m1 stop
$579United Airlines
Find Deal
Tue, Sep 16 - Mon, Sep 22
United Airlines Logo
2:00 pm - 11:56 amSOF-PHL
28h 56m2 stops
United Airlines Logo
7:58 pm - 11:00 pmPHL-SOF
20h 02m2 stops
$582United Airlines
Find Deal
Tue, Sep 16 - Thu, Sep 25
United Airlines Logo
2:00 pm - 11:56 amSOF-PHL
28h 56m2 stops
United Airlines Logo
5:35 pm - 1:05 pmPHL-SOF
12h 30m1 stop
$584United Airlines
Find Deal
Wed, Sep 17 - Fri, Sep 26
United Airlines Logo
6:15 am - 4:00 pmSOF-PHL
16h 45m1 stop
United Airlines Logo
5:35 pm - 10:50 pmPHL-SOF
22h 15m1 stop
$594United Airlines
Find Deal
Fri, Sep 19 - Fri, Oct 10
 Logo
7:00 am - 5:20 pmSOF-PHL
17h 20m2 stops
 Logo
1:42 pm - 2:00 pmPHL-SOF
17h 18m2 stops
Fri, Sep 19 - Tue, Sep 23
KLM Logo
7:00 am - 5:20 pmSOF-PHL
17h 20m2 stops
KLM Logo
1:35 pm - 2:00 pmPHL-SOF
17h 25m2 stops
$605KLM
Find Deal
Sun, Sep 21 - Sat, Sep 27
Austrian Airlines Logo
8:00 am - 4:00 pmSOF-PHL
15h 00m2 stops
Austrian Airlines Logo
4:50 pm - 11:40 amPHL-SOF
35h 50m2 stops
$616Austrian Airlines
Find Deal
Fri, Sep 19 - Sat, Sep 27
Austrian Airlines Logo
4:05 pm - 4:00 pmSOF-PHL
54h 55m2 stops
Austrian Airlines Logo
4:50 pm - 11:40 amPHL-SOF
35h 50m2 stops
$635Austrian Airlines
Find Deal
Booking Insights

KAYAK's insights & trends for flights to Philadelphia

Get data-powered insights and trends for flights to Philadelphia to help you find the cheapest flights, the best time to fly and much more.

How long is the flight to Philadelphia?

The duration of your flight to Philadelphia depends on your departure and arrival airports. Obviously, any flights that include a layover will also be longer. The most popular route to Philadelphia on KAYAK is from Sofia, which takes 16h 45m.

How many direct flights to Philadelphia are there each day?

There are around 401 direct flights from within Bulgaria to Philadelphia every day. Most flights depart in the morning, with 6:00 am the most common departure time and 52% of flights departing in the morning.


Good to know

Low seasonMarch
Cheapest flight$573
Best time to beat the crowds with an average 23% drop in price.
Most popular time to fly with an average 8% increase in price.
Flight from Sofia to Philadelphia

FAQs - booking Philadelphia flights

  • How far is Philadelphia Airport from central Philadelphia?

    The city center of Philadelphia is 7 miles from Philadelphia Airport.

  • What is the name of Philadelphia’s airport?

    There is only 1 airport in Philadelphia, called Philadelphia Airport (PHL). It can also be referred to as Philadelphia or Philadelphia Intl.

  • What is the cheapest day to fly to Philadelphia?

    Based on KAYAK data, the cheapest day to fly to Philadelphia is Wednesday where round-trip tickets can be as cheap as $579. On the other hand, the most expensive day to fly is Thursday, where round-trip prices are $986 on average.

  • How does KAYAK find such low prices on flights to Philadelphia?

    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 to Philadelphia.

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

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

  • What is the Hacker Fare option on flights to Philadelphia?

    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 Philadelphia with an airline and back with another airline.

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

    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 Philadelphia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Philadelphia?

    The cheapest time of day to fly to Philadelphia is generally at night, when round-trip flights cost $651 on average. The most expensive time of day to fly to Philadelphia is generally in the morning, which is peak travel time and where the average cost of a ticket is $742.

  • How many direct flights to Philadelphia are there each week?

    Each week there are around 2,806 direct flights from within Bulgaria to Philadelphia. The most common day for departures is Friday, with 15% of flights taking off on this day.

Top tips for finding cheap flights to Philadelphia

  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Philadelphia flight deals.

Reviews of the top airlines flying from Bulgaria to Philadelphia

 
See real verified KAYAK customer reviews for airlines flying to Philadelphia. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Bulgaria to Philadelphia. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with to Philadelphia? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 8905 reviews
8.1Crew
7.0Entertainment
6.6Food
7.7Boarding
7.3Comfort
Airline reviews

The food and sitting need improvements. They were extremely bad.. If you choose to recline, there is no room for the passenger behind you. This is one of the worst sitting arrangements that I ever experience. The aircraft was not properly clean before boarding.

4.0 OkayAnonymous, Aug 2025FRA - MCO
Read more United Airlines reviews

The food and sitting need improvements. They were extremely bad.. If you choose to recline, there is no room for the passenger behind you. This is one of the worst sitting arrangements that I ever experience. The aircraft was not properly clean before boarding.

I found the staff to not be very attentive at all. When paying for Business Class you expect a certain type of service and that was not found. They were almost rude even

Not good , late, and long. We came home so late and spent so much time flying around and taxiing

Terrible. Delayed 7 hours, and cancelled the flight, leaving me stranded and out of pocket $500 for an alternative last minute flight

Was on time until within 1 hour of flight-how does that happen? Staff very friendly.

Had one staff that was not pleasant. Seems they are stressed with too many people to care for.

Weather delay in Chicago?. No sense of urgency to make connection in Chicago for our connecting flight that wasn't delayed. Connection was missed.

Ok. Get a different kosher caterer. The food was odd.

Food was terrible. Crew was kind but skipped over my row for providing sandwiches and beverages.

Our flight was understandably diverted to a small regional airport in Laramie, Wyoming due to weather conditions, which I fully recognize and appreciate. However, the low rating stems from the experience that followed: passengers remained on board for over an hour without the option to deplane and stretch, despite the aircraft being stationary. Although the pilot opened the cabin door, only he was permitted to exit. Meanwhile, passengers grew increasingly uncomfortable as warm summer air entered the cabin through the open door, and being in the second row meant we were impacted immediately. While the flight attendants made efforts to keep everyone at ease, I believe allowing passengers to deplane briefly, given the extended delay, would have significantly improved the overall experience.

Liked the flight being almost on time (airport issues created a delay). Disliked the issue printing tag bags on the kiosk and having to wait for an hour on like to drop my bags.

Our flight was delayed for over an hour due to weather, and it had already been a long travel day. However, the crew was calm and compassionate, listening to every complaint with genuine concern. They got us home safely without incident, in spite of all of the obstacles. I’m grateful.

The flight crew was friendly and accommodating. I witnessed one of the flight attendants deal with a difficult flyer with extreme calm and compassion. I was so annoyed with the passenger and so impressed by the flight attendant. His quick action de-escalated what could have been a major incident. He was awesome.

Insulting. Lufthansa flight from Munich to EWR had us getting our luggage when we were told in Florence that it would follow us to Indianapolis. It did not. Then very slow security in EWR caused me and three other passengers from Lufthansa flight from Munich to miss the boarding closure. Behind me were two elderly grandparents and their ten year old grandson. We were all refused entry on a plane to Indy that was still at the gate. The doors had not even closed inside the terminal yet. No apologies or compensation offered. Not even a meal voucher let alone a free hotel stay for our inconvenience. I m not sure what the other three passengers behind me did ( they were elderly with a grandson, recall), but I stated 12 hours overnight in a chilly EWR airport until next flight to Indy at 850 next morning.

I was told in Florence my bag would go directly to Indianapolis. I had to wait to get it. Then security in EWR was slow so I missed my flight as United would not allow me on the plane even though it was still on the tarmac and the door to the tunnel was open. I blame both Lufthansa and United for refusing to allow me on board a plane that was clearly still on the tarmac. Behind me two grandparents and their ten year old grandson were on same flight from Munich to EWR. They were refused to board the United flight. So we had to sit for 12 hours in airport until next flight. No compensation has been offered either by Lufthansa or United.

Flight was delayed and luggage was delivered day after arrival. In Bilbao they told me day after would be delivered faster if I went to Bilbao to get my own bags so I did. Wasted my morning.

Seating was average for a first class seat. It very modern. I expected better.

very small seats screen did not work . I could not watch anything for 9 hours

The food that was served was superb!!! Awesome snacks!!! Frequent drink service!!! To me, this was shocking. I took a British Airways flight from Denver to London for the first leg of my trip and the food was horrendous. Thank you for keeping us fed and satiated on such a long flight!!!!

The seating arrangement by having privacy screens would have been more appealing. If you sit in the business class, you pay for extra comfort and privacy. Other than that, the service was excellent and the staff very professional.

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