SOF - PHL

$642 Find Cheap Flights from Sofia 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 from Sofia to Philadelphia departing on 8/15. 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 in flight searches from Sofia to Philadelphia, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Sofia to Philadelphia, as well as popular online travel agencies
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Flights Deals

Cheap Flights from Sofia to Philadelphia (SOF-PHL)

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

Fri, Aug 15 - Thu, Sep 4
United Airlines Logo
6:15 am - 9:35 pmSOF-PHL
46h 20m2 stops
United Airlines Logo
6:30 am - 11:00 pmPHL-SOF
33h 30m2 stops
$642United Airlines
Find Deal
Fri, Aug 15 - Thu, Sep 4
United Airlines Logo
6:15 am - 9:35 pmSOF-PHL
46h 20m2 stops
United Airlines Logo
5:35 pm - 1:05 pmPHL-SOF
12h 30m1 stop
$644United Airlines
Find Deal
Mon, Jul 14 - Mon, Jul 21
Air Canada Logo
6:15 am - 10:07 pmSOF-PHL
22h 52m2 stops
Air Canada Logo
7:30 am - 12:00 pmPHL-SOF
21h 30m2 stops
$672Air Canada
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Mon, Jul 14 - Mon, Jul 21
 Logo
6:15 am - 2:37 pmSOF-PHL
39h 22m2 stops
 Logo
5:35 pm - 1:00 pmPHL-SOF
12h 25m1 stop
Mon, Jul 14 - Mon, Jul 21
Lufthansa Logo
6:40 pm - 4:00 pmSOF-PHL
28h 20m1 stop
Lufthansa Logo
5:35 pm - 1:00 pmPHL-SOF
12h 25m1 stop
$790Lufthansa
Find Deal
Fri, Aug 15 - Thu, Sep 4
Air Canada Logo
6:00 am - 2:37 pmSOF-PHL
39h 37m2 stops
Air Canada Logo
3:25 pm - 1:05 pmPHL-SOF
14h 40m2 stops
$827Air Canada
Find Deal
Mon, Jul 14 - Mon, Jul 21
SWISS Logo
12:45 pm - 5:36 pmSOF-PHL
35h 51m3 stops
SWISS Logo
5:35 pm - 10:05 amPHL-SOF
33h 30m2 stops
$938SWISS
Find Deal
Fri, Aug 15 - Thu, Sep 4
SWISS Logo
12:45 pm - 5:36 pmSOF-PHL
35h 51m3 stops
SWISS Logo
5:35 pm - 10:05 amPHL-SOF
33h 30m2 stops
$939SWISS
Find Deal
Fri, Aug 15 - Thu, Sep 4
Lufthansa Logo
6:15 am - 4:00 pmSOF-PHL
16h 45m1 stop
Lufthansa Logo
5:35 pm - 1:05 pmPHL-SOF
12h 30m1 stop
$965Lufthansa
Find Deal
Mon, Jul 14 - Mon, Jul 21
 Logo
5:00 am - 10:07 pmSOF-PHL
24h 07m3 stops
 Logo
5:35 pm - 12:05 pmPHL-SOF
35h 30m3 stops
$1,192
Find Deal
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KAYAK's insights & trends for Sofia to Philadelphia flights

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

What’s the cheapest day of the week to fly from Sofia to Philadelphia?

The average price of all round-trip flights from Sofia to Philadelphia clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from Sofia to Philadelphia, look for departures on Wednesdays and avoid leaving on a Thursday, as it's usually the priciest day. When flying back from Philadelphia, Tuesday is the cheapest day to fly and Saturday is the most expensive.

Good to know

Low seasonMarch
High seasonJune
Cheapest flight$642
Best time to beat the crowds with an average 23% drop in price.
Most popular time to fly and prices are also 4% lower on average.
Flight from Sofia to Philadelphia

When to book flights from Sofia to Philadelphia

Are your dates flexible? Find out the best times to travel from Sofia to Philadelphia based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Sofia to Philadelphia

  • What is the cheapest flight from Sofia to Philadelphia?

    In the last 3 days, the lowest price for a flight from Sofia to Philadelphia was $654 for a one-way ticket and $642 for a round-trip.

  • Do I need a passport to fly between Sofia and Philadelphia?

    Yes

  • Which aircraft models fly most regularly from Sofia to Philadelphia?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Sofia to Philadelphia?

    oneworld, and Star Alliance are the airline alliances operating flights between Sofia and Philadelphia, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Sofia to Philadelphia, United Airlines or Lufthansa?

    The two airlines most popular with KAYAK users for flights from Sofia to Philadelphia are United Airlines and Lufthansa. With an average price for the route of $755 and an overall rating of 7.4, United Airlines is the most popular choice. Lufthansa is also a great choice for the route, with an average price of $777 and an overall rating of 6.8.

  • How does KAYAK find such low prices on flights from Sofia 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 from Sofia to Philadelphia.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Philadelphia from Sofia 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 Sofia 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 to Sofia with another airline. Booking your flights between Sofia and PHL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Sofia 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 from Sofia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top airlines flying from Sofia to Philadelphia

 
See real verified KAYAK customer reviews for airlines flying from Sofia to Philadelphia. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Sofia 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 8801 reviews
6.6Food
7.7Boarding
7.3Comfort
8.1Crew
7.0Entertainment
Airline reviews

Gate agent did not hold flight for connection, provided no assistance to get new flight

2.0 MediocreJack, Jun 2025SAT - IAH
Read more United Airlines reviews

Gate agent did not hold flight for connection, provided no assistance to get new flight

Evidently, my seat had the only broken TV. I couldn’t plug it in, get it to come on, or watch anything, and of course, no one could fix it while we were on the plane. The service was good and the boarding was quick

United airlines, mediocre at best. No issues , nothing great . Worked for me

Efficient, calm when things were delayed and kept us regularly informed of what was happening.

it was so bad. I tried to board my flight from vancouver to saskatoon. And to my surprise they did not board me cause the flight was changed and no email was send to me. and on my boarding pass which i got from seattle says different flight. I did not knew anyone from Vancouver, air canada crew was rude, i asked for today flight but they were rude and i had early morning dental appointment in saskatoon. I was so much in pain and my whole day is wasted today. and i suffered alot. They did provide me hotel but they did not provide me any food. I am really really disappointed first time had so bad experience with air canada. I may think twice to book it again. If i can get any reply or any composition that would be great. Thanks

It was fine, definitely older planes with no charging or anything. There’s no entertainment set up on board, but it is nice that they allow you to access the in flight entertainment from your phone without having to pay for the Wi-Fi and they do offer free texting.

Boarding was mayhem. Late boarding by 15 minutes because of lack of staff (missing 1 flight attendant. We had to wait for an arrival of another plane before we could board). Flight was a little rough, but cannot blame on airlines.

Impressed with the service despite turbulence because of the weather. Both flights arrived before their scheduled times.

Very comfortable (upgraded to business class). The audio on my screen didn’t work, but I managed to play the audio through my phone while watching the screen.

Great experience…left a bit behind schedule but made up fir that in the air and landed 10 minutes early 😁

I was very grateful for Lufthansa's role in organizing mobility support. The touchscreen on my seat was faulty: slow, stained (I couldn't get it clean), and glitchy. This made selecting movies extremely time consuming, and twice I had to start all over from the beginning.

Beautifully maintained airplane, good food, professional crew, top-notch communication. I highly recommend Lufthansa for intercontinental flights between the United States and Europe.

Lufthansa is my favorite airline and have flown oversea with them for the past 25 years: i always found them so professional and incredibly efficient from checking in to arrival. I also love their Munich or Frankfurt airports.

The United flight was excellent! The flight attendants were attentive and nice, and the food was very good! And the glasses are larger than on Lufthansa flights! I don’t want to have to ask for 15 glasses of water because their glasses are ridiculously small!

The food not that great. Did not like the fact that we could not purchase upgrade at the airport

We paid for business class, and my seat did not work at all. Each time I wanted to adjust the position, an attendant had to come to physically force the seat into its new position. They tried to fix it by fiddling with the electronics (military reset, for example), to no avail. Also, the food was just mediocre. We were at the end of a serving section, so they ran out of several choices. (This was on the flight from Los Angeles to Munich.)

The crew was the best I’ve ever encountered. Business class was spacious, immaculate, and very modern.

They gave us chocolates twice (for whoever would like an extra chocolate - kids did!). I asked for an extra water, and I was given one. Crew was very friendly!

The plane was very clean. The bathroom was clean as well. The land crew were very polite and informative and helpful. They informed me that there is a long way and challenging to go from international terminal to national terminal and in addition to getting my suitcases and going through customs and dropping them again for my second leg of trip which was San Francisco to Los Angeles . I have left knee issue and had a recent fall with aching muscles all over, the land crew suggested wheelchair help for me, God bless her. If I did not have help, I could not make it to my last terminal. Thank you UNITED AIRLINE!

I like the service and the efficiency. I am lactose intolerant and the lactose intolerant meal in business class was not astounding. Also, the business class fully reclining seats are not that comfortable.

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

Information on your arrival and departure airports

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