SOF - PHL

$502 Find Cheap Flights from Sofia to Philadelphia

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Sofia to Philadelphia departing on 4/26. 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

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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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$722
Lufthansa
Thu 4/2Thu 4/9
SOF - PHL • 1 stop
Cheapest one-way
$502
Multiple Airlines
Sun 4/26
SOF - PHL • 3 stops
Top airlines
Lufthansa
Cheapest • from $722 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Sofia and Philadelphia. You'll need at least 1 connection.
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We hope you love your trip to Philadelphia!
Flight Deals
Booking Insights
Flight 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

Thu, Apr 2 - Thu, Apr 9
Lufthansa Logo
6:30 am - 4:05 pm
SOF
-
PHL
16h 35m
1 stop
Lufthansa Logo
5:40 pm - 1:20 pm
PHL
-
SOF
12h 40m
1 stop
$722Lufthansa
Thu, Apr 30 - Thu, May 7
Multiple Airlines Logo
6:30 am - 4:05 pm
SOF
-
PHL
16h 35m
1 stop
Multiple Airlines Logo
11:32 am - 3:05 pm
PHL
-
SOF
20h 33m
2 stops
$728Multiple Airlines
Thu, Apr 2 - Thu, Apr 9
Lufthansa Logo
6:30 am - 4:05 pm
SOF
-
PHL
16h 35m
1 stop
Lufthansa Logo
5:40 pm - 1:20 pm
PHL
-
SOF
12h 40m
1 stop
$729Lufthansa
Thu, Apr 2 - Thu, Apr 9
United Airlines Logo
6:30 am - 4:05 pm
SOF
-
PHL
16h 35m
1 stop
United Airlines Logo
7:45 pm - 6:40 pm
PHL
-
SOF
15h 55m
2 stops
$731United Airlines
Thu, Apr 2 - Thu, Apr 9
United Airlines Logo
6:30 am - 4:05 pm
SOF
-
PHL
16h 35m
1 stop
United Airlines Logo
5:40 pm - 1:20 pm
PHL
-
SOF
12h 40m
1 stop
$732United Airlines
Thu, Apr 2 - Thu, Apr 9
United Airlines Logo
6:30 am - 4:05 pm
SOF
-
PHL
16h 35m
1 stop
United Airlines Logo
5:40 pm - 1:20 pm
PHL
-
SOF
12h 40m
1 stop
$733United Airlines
Thu, May 7 - Sat, May 23
Air Canada Logo
6:30 am - 2:48 pm
SOF
-
PHL
15h 18m
2 stops
Air Canada Logo
4:20 pm - 11:00 am
PHL
-
SOF
35h 40m
2 stops
$735Air Canada
Thu, Apr 2 - Thu, Apr 9
United Airlines Logo
6:30 am - 4:05 pm
SOF
-
PHL
16h 35m
1 stop
United Airlines Logo
7:45 pm - 6:40 pm
PHL
-
SOF
15h 55m
2 stops
$736United Airlines
Thu, Apr 2 - Thu, Apr 9
United Airlines Logo
2:10 pm - 12:59 am
SOF
-
PHL
17h 49m
2 stops
United Airlines Logo
7:45 pm - 6:40 pm
PHL
-
SOF
15h 55m
2 stops
$737United Airlines
Thu, Apr 2 - Thu, Apr 9
United Airlines Logo
6:30 am - 4:05 pm
SOF
-
PHL
16h 35m
1 stop
United Airlines Logo
7:45 pm - 6:40 pm
PHL
-
SOF
15h 55m
2 stops
$739United Airlines
Booking Insights

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.

Which airlines provide the cheapest flights from Sofia to Philadelphia?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Sofia to Philadelphia were found on Lufthansa ($722) and United Airlines ($731).

Find deals

Good to know

Low seasonSeptember
Cheapest flight$502
Best time to beat the crowds with an average 19% drop in price.
Most popular time to fly with an average 10% increase in price.
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 $502 for a one-way ticket and $722 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?

    Star Alliance is the only airline alliance operating flights between Sofia and Philadelphia.

  • 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 $821 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 $792 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.

Reviews of the 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 9451 reviews
7.3Comfort
7.7Boarding
7.1Entertainment
6.6Food
8.1Crew
Airline reviews

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

8.0 ExcellentMatthew, Mar 2026
IAD - CMH
Read more United Airlines reviews

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

Offered to check carry on to final destination. This is the most absurd thing in the world. I'm carrying on because I need what is in the carry-on. I'm okay with picking up at next stop but then I will be on much larger plane that can accommodate it. Also, if there is ever a change to your flight. Go to the airport and have the people there fix your ticket. Don't do it over the phone or online with United they screwed us up and ended up with flights for our last leg that took off before our first leg.

The economy seats on the 777 was not as cramped as I had feared, but the food was terrible.

Experience was great - no complaints. Took off on time, landed early. Got to the gate relatively quickly - took a little bit of extra time to deplane but nothing excessive.

Economy plus was so cramped I could not use my laptop. It was beyond bad.

OK, we were delayed and had to de plane and reboard.

United is one airline which regardless of how many separate United tickets in existence, if one flight breaks down, the airline will take care of all the flights.

Both our flights were delayed. Almost didn’t get in the second flight. Staff was rude to the bone.

Hopped on time for the flight only to get deplaned and delayed another 2.5 hours.

Terrible experience! delay 2 time and say i dont have ticket

How about changing the personal out to more friendly human beings? This team was pretty arrogant. No fun!!

Everything could have been better. What needed to be wrong with United went wrong

Excellent service. The crew goes above their way to make the customer comfortable.

It was good. The seats in economy weren’t bad

I hated the FRA Airport. Confusing signage, including the path to Immigration and Security It seems that the airport grew haphazardly over the years. I have been through multiple WW Hubs with much better experiences.

Excellent service; they helped me reschedule so I can fly in an earlier flight

Wonderful staff. The boarding process can be improved a little better by adequate prior communication but all in all they did fine. However the boarding gate was quite unfreindly to elderly and who needs help with sevral stairs.

Flight map did not work. Crew was great, food was good, plane took off on time and landed early. That's all I can ask.

I had a good comfortable seat. There was nearly an hour delay. There was an accident with the champagne, but I was well compensated. These things happen sometimes.

Very good. Comfortable and I felt well taken care of from start to finish

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

Information on your arrival and departure airports

Sofia (SOF)
Philadelphia (PHL)