$275 Find Cheap Flights from Philadelphia to Bulgaria - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Philadelphia to Bulgaria departing on 12/1. 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, 0 bags

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Cheap Flights from Philadelphia to Bulgaria

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Sofia
Sofia2 stops$732
Varna
Varna2 stops$1,439
Burgas
Burgas2 stops$845
Sofia
Sofia2 stops$732
Varna
Varna2 stops$1,439
Burgas
Burgas2 stops$845

Book Cheap Philadelphia to Bulgaria Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Philadelphia to Bulgaria 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 Philadelphia to Bulgaria

Tue, Sep 1 - Thu, Oct 8
Multiple Airlines Logo
4:20 pm - 6:00 pm
PHL
-
SOF
18h 40m
2 stops
Multiple Airlines Logo
2:10 pm - 10:46 pm
SOF
-
PHL
15h 36m
2 stops
$732Multiple Airlines
Wed, Sep 9 - Wed, Oct 14
Multiple Airlines Logo
10:30 am - 6:40 pm
PHL
-
SOF
25h 10m
2 stops
Multiple Airlines Logo
6:20 am - 4:05 pm
SOF
-
PHL
16h 45m
1 stop
$736Multiple Airlines
Tue, Sep 1 - Thu, Oct 8
United Airlines Logo
3:05 pm - 6:40 pm
PHL
-
SOF
20h 35m
2 stops
United Airlines Logo
6:30 am - 4:05 pm
SOF
-
PHL
16h 35m
1 stop
$737United Airlines
Wed, Sep 9 - Wed, Oct 14
Multiple Airlines Logo
7:40 pm - 11:15 pm
PHL
-
SOF
20h 35m
2 stops
Multiple Airlines Logo
6:20 am - 9:32 pm
SOF
-
PHL
22h 12m
2 stops
$739Multiple Airlines
Tue, Sep 1 - Thu, Oct 8
Lufthansa Logo
5:40 pm - 1:05 pm
PHL
-
SOF
12h 25m
1 stop
Lufthansa Logo
6:30 am - 4:05 pm
SOF
-
PHL
16h 35m
1 stop
$740Lufthansa
Tue, Oct 13 - Fri, Oct 30
Air Canada Logo
10:05 am - 6:40 pm
PHL
-
SOF
25h 35m
2 stops
Air Canada Logo
6:25 am - 4:21 pm
SOF
-
PHL
39h 56m
2 stops
$743Air Canada
Wed, Oct 14 - Fri, Oct 30
United Airlines Logo
10:40 am - 12:10 pm
PHL
-
SOF
18h 30m
2 stops
United Airlines Logo
6:25 am - 10:56 pm
SOF
-
PHL
22h 31m
2 stops
$744United Airlines
Wed, Oct 14 - Fri, Oct 30
United Airlines Logo
5:40 pm - 1:25 pm
PHL
-
SOF
12h 45m
1 stop
United Airlines Logo
6:25 am - 10:56 pm
SOF
-
PHL
22h 31m
2 stops
$751United Airlines
Mon, Sep 28 - Tue, Oct 20
Lufthansa Logo
5:40 pm - 10:40 pm
PHL
-
SOF
22h 00m
1 stop
Lufthansa Logo
6:10 am - 4:05 pm
SOF
-
PHL
16h 55m
1 stop
$770Lufthansa
Mon, Sep 28 - Tue, Oct 20
Lufthansa Logo
5:40 pm - 6:00 pm
PHL
-
SOF
17h 20m
1 stop
Lufthansa Logo
6:10 am - 4:05 pm
SOF
-
PHL
16h 55m
1 stop
$771Lufthansa
Booking Insights

KAYAK's insights & trends for Philadelphia to Bulgaria flights

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

What is the cheapest month to fly from Philadelphia to Bulgaria?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Philadelphia to Bulgaria, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Philadelphia to Bulgaria is November, when tickets cost $540 (return) on average. On the other hand, the most expensive months are January and December, when the average cost of round-trip tickets is $7,242 and $1,311 respectively.

Good to know

Low season

January

Cheapest flight

$275
Best time to beat the crowds but there is an average 430% increase in price.
Most popular time to fly and prices are also 33% lower on average.
Flight from Philadelphia to Sofia

FAQs - booking Bulgaria flights

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

    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 Philadelphia to Bulgaria.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Philadelphia to Bulgaria 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 Philadelphia to Bulgaria?

    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 from Philadelphia to Bulgaria 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 from Philadelphia to Bulgaria?

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

Reviews of the top airlines flying from Philadelphia to Bulgaria

 
Need help choosing which airline to fly with from Philadelphia to Bulgaria? 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 10058 reviews
7.3Comfort
8.1Crew
7.1Entertainment
6.7Food
7.7Boarding
Airline reviews

The flight crew were very helpful. The seats were very close together. There was barely room to sit without touching the person next to you.

4.0 OkayN, Jul 2026
PHL - ORD
Read more United Airlines reviews

The flight crew were very helpful. The seats were very close together. There was barely room to sit without touching the person next to you.

It was great. All the crew were professional and nice.

The flight I was supposed to be on was supposed to take off at 1:50 from State College. It was delayed over and over and over again until somehow I had to rebook on a flight that was supposed to have left State College at 8 am that morning but didn't end up taking off until almost 6 pm. Not only was this completely unacceptable, the "token from United" was a 15 dollar meal voucher that has to be used by today. I would personally like some miles added to my account for this inconvenience. I was in transit for 8 hours from the time I arrive at State College Aiport to when I got home. I was supposed to be home at 3 pm and I returned at 8 pm. Unacceptable. I have not been on an on Time united flight in nearly 5 years.

newer aircraft, ability to connect my headset via blue tooth for entertainment.

Miserable. They moved my seat, but canceled the next leg of my flight. I resolved the issue at my transfer, but that resulted in lost luggage that has taken days off my schedule with no resolution. Worse, they fail to interface effectively with Lufthansa, forcing me to bounce between two equally useless help desks. The apps are unable to handle the situation, the bag dropped off the tracker, and while the call centers are polite, they do not provide written information to assist with cross-airline communication.

The only downside was my cell phone charger wouldn’t work in the charging port but everyone else’s would work in them all. My cell phone cable works fine in my hotel room in Frankfurt.

My husband and I recently had an unfortunate experience with Lufthansa. At the Philadelphia International airport, the ground staff refused to board us because we didn’t have a current visa stamped on our passports for Frankfurt. We completely understand that this was our mistake. we should have double-checked the visa requirements before our trip. However, the issue that upset us most was how the situation was handled by the staff. They told us they would mark it as “boarding denied due to visa issue”, but instead they recorded it as “no show”. Because of that incorrect entry, our return flight was automatically cancelled as well, which caused additional stress and expense. Mistakes can happen, but we expected more transparency and accuracy from a reputed airline like Lufthansa. It would have made a big difference if the staff had been more careful and considerate in documenting the situation correctly.

Everything was good, except the seats in economy were so close together, you could barely get out when the seat in front of your was reclined. If the airlines keep jamming in more and more seats, it will become intolerable. I will look for another airline that considers customer comfort and does not keep adding more rows of seats for more profit.

Flight attendant moved my bag without notifying me and was rude to me when I asked him about it. There was no reason to move it.

Flight was on time, crew were excellent. For some reason our originally selected seats were changed. We had to re-choose our seats when we checked in online and options were limited. One of our two checked bags we placed on the wrong carousel. It was only be shear luck that I saw it. That cost us 20 minutes of wasted time. So much for the “priority” tags. They are meaningless, and have been ever since they were implemented. I wish you would do the save some money and stop using them.

Extremely uncomfortable seats. Experience was like a Frontier Airlines flight. Would not fly it again.

Booked Economy but it translated to economy light for Lufthansa so now we are stuck paying an extra $75 per person both ways for our checked bags. If I had known that, I would have never booked these tickets because it came out to be more than other options. The booking in the kayak side clearly says Economy and has a link to the inormation for Lufthansa which states Economy included a checked bag. Super annoyed about that.

Flight was a little late. The crew was courteous, food ok

Very nice. Crew was excellent and our seats had great legroom which we paid extra for so I highly recommend this option when flying internationally.

Check in was great. Boarding seemed less organized. Flight was good.

My flight was canceled. New flight is 40 hours later and I still didn’t get the flight from Frankfurt to Zagreb.

Meals were nice are abundant, the staff on both flights were personable and well trained

Budget airline feeling. Bad food, no drinks stingy to give even water

The transatlantic leg was on Discover Airlines. I’m 6’2” and the extra leg room seat was acceptable, the seat it self was moderately comfortable (slightly softer than a church pew). The food was a standard economy fare. Frankfurt to Prague leg was on Lufthansa the business class was as advertised 10 across the board.

Recent movies and music availability like it used to be

Everything you need to know for your flight from Philadelphia to Bulgaria

Information on your arrival and departure airports