SOF - PHL

$418 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 5/22. 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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Everything you should know

Cheapest round-trip
$675
Typical prices: $729-$792
Lufthansa
Thu 1/15Thu 1/22
SOF - PHL • 1 stop
Cheapest one-way
$418
British Airways
Fri 5/22
SOF - PHL • 1 stop
Top airlines
Lufthansa
Cheapest • from $675 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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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, Jan 15 - Thu, Jan 22
Lufthansa Logo
6:00 am - 4:05 pm
SOF
-
PHL
17h 05m1 stop
Lufthansa Logo
5:40 pm - 1:50 pm
PHL
-
SOF
13h 10m1 stop
$675Lufthansa
Thu, Jan 15 - Thu, Jan 22
Lufthansa Logo
6:05 am - 4:05 pm
SOF
-
PHL
17h 00m2 stops
Lufthansa Logo
5:40 pm - 1:50 pm
PHL
-
SOF
13h 10m1 stop
$676Lufthansa
Thu, Jan 15 - Thu, Jan 22
United Airlines Logo
6:00 am - 9:36 pm
SOF
-
PHL
22h 36m2 stops
United Airlines Logo
6:30 am - 10:45 pm
PHL
-
SOF
33h 15m2 stops
$706United Airlines
Thu, Jan 15 - Thu, Jan 22
Multiple Airlines Logo
6:00 am - 3:49 pm
SOF
-
PHL
40h 49m2 stops
Multiple Airlines Logo
3:30 pm - 1:50 pm
PHL
-
SOF
15h 20m2 stops
$725Multiple Airlines
Wed, Jan 28 - Sun, Feb 1
British Airways Logo
9:00 pm - 4:15 pm
SOF
-
PHL
26h 15m1 stop
British Airways Logo
6:35 pm - 4:20 pm
PHL
-
SOF
14h 45m1 stop
$745British Airways
Thu, Jan 15 - Thu, Jan 22
SWISS Logo
4:00 pm - 9:36 pm
SOF
-
PHL
36h 36m2 stops
SWISS Logo
1:10 pm - 6:20 pm
PHL
-
SOF
46h 10m3 stops
$812SWISS
Thu, Jan 15 - Thu, Jan 22
SWISS Logo
4:00 pm - 9:36 pm
SOF
-
PHL
36h 36m3 stops
SWISS Logo
1:10 pm - 6:20 pm
PHL
-
SOF
46h 10m3 stops
$840SWISS
Wed, Jan 28 - Sun, Feb 1
British Airways Logo
9:00 pm - 3:40 pm
SOF
-
PHL
25h 40m2 stops
British Airways Logo
7:50 pm - 4:20 pm
PHL
-
SOF
13h 30m1 stop
$869British Airways
Wed, Jan 28 - Sun, Feb 1
British Airways Logo
9:00 pm - 3:40 pm
SOF
-
PHL
25h 40m2 stops
British Airways Logo
12:23 pm - 4:20 pm
PHL
-
SOF
20h 57m2 stops
$874British Airways
Thu, Jan 1 - Sun, Mar 1
United Airlines Logo
2:35 pm - 10:46 pm
SOF
-
PHL
15h 11m2 stops
United Airlines Logo
12:55 pm - 6:20 pm
PHL
-
SOF
22h 25m2 stops
$1,412United 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.

How much is a round-trip flight from Sofia to Philadelphia?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Sofia to Philadelphia departing in January.

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
Cheapest flight$418
Best time to beat the crowds with an average 20% drop in price.
Most popular time to fly with an average 13% 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 $418 for a one-way ticket and $675 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 $727 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 $791 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 9092 reviews
7.7Boarding
8.1Crew
6.6Food
7.1Entertainment
7.3Comfort
Airline reviews

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

10.0 ExcellentRoger, Dec 2025
CAE - ORD
Read more United Airlines reviews

The flight was on time. I generally don’t drink or eat on short flights and the seats were good and the flight attendants were friendly. That’s all I expect

Movie selection is good. Crew did not understand mileage program and were no help. Sick later. Food?

Staff on board was excellent. Positive upbeat helpful- like it used to be.

It was nice to have gotten up upgraded to first class with a meal on a three hour flight

For an expensive flight to another country, United has a lot of nerve serving pretzels and no meals (unless, of course, you want to buy something to eat). Unacceptable.

The food is terrible. The same pasta or chicken with bad taste and presentation

United have really come back. Airport and boarding process is clear and good, app and information also very good

The Sears in the 800s are not too good perfect Airbus why cant the new 737 fix that

Flight was delayed 8 times. We were sitting at the airport for 14 hours. We got 2 hours of sleep (if that) on what was not meant to be a red-eye.

It was probably one of the worst flights I’ve been on. The restrooms were never cleaned or stocked. The food was very subpar, and i usually enjoy airline food, so I was disappointed. It was just all around a bad experience. The only saving grace was the flight attendants.

This review is based on 2 things: 1. The lack of hygiene on the plane. 2. William - the head flight attendant. The lack of cleanliness on the plane upon arrival was appalling. Being given a sanitizing wipe upon boarding of the plane is shocking when you consider the cost of a business class flight. UA expects me to do their job and clean all the bread, food and debris left from previous guests. Does this sound normal to you. The seat, the food table and the sides were full of crumbs, chocolate and dirt. When I told the flight attendant they just gave me more wipes so I could clean it myself. Secondly, William the business cabin head flight attendant was so busy flirting with a couple in the front that his attention to the other guests was minimal. He continuously asked them if they were ok or if they needed anything and it didn’t matter if the rest of us needed anything. And if you are the lead attendant shouldn’t you be checking if the bathrooms in business class are clean and needing toilet paper. There were 2 bathrooms in business. Halfway through the flight the first bathroom was closed and the second bathroom was dirty and had no toilet paper one hour and a half before the flight landed. He needs additional training on prioritizing things. He should care less about flirting and more about his work

Booked seats (paid extra) online and found they didn’t exist on the flight. We were then separated from the rest of our party. Given seats in the very back of the plane. We will not fly Discover or Lufthansa again. We will not book flights or travel through Kayak again!

Had a few open seats and could use it for a great rest ful journey

It was very good. Service was friendly and efficient, and food was good.

Airline food is airline food, but the plane was wonderful and the seating comfort outstanding. One of my best flights in quite a while.

Crew was outstanding, helpful and friendly. Food is deteriorating. The snack at the end of the flight was not good, a greasy moosh of toast cheese snd other unidentifiable ingredients. Coming from Germany a pretzl with butter would have been better. Entertainment had a great selection.

Smooth flight with enough time for connection. Ran out of meal options. In-flight and gate staff were friendly and helpful. Good service overall.

The seat space seemed small especially when the person ahead reclined but other than that, very good.

Luggage transfer in Chicago was not performed in time. I received my luggage at my destination two days later.

Give yourself over 2+ hours layover because if flight is slighlty delayed and you miss your connection, Lufthansa will do nothing for you

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

Information on your arrival and departure airports