SOF - PHL

$389 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 11/9. 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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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

Sun, Nov 9 - Sun, Nov 16
British Airways Logo
2:30 pm - 1:25 pmSOF-PHL
29h 55m1 stop
British Airways Logo
6:35 pm - 4:20 pmPHL-SOF
14h 45m1 stop
$564British Airways
Find Deal
Sun, Nov 9 - Sun, Nov 16
American Airlines Logo
2:30 pm - 1:25 pmSOF-PHL
29h 55m1 stop
American Airlines Logo
5:25 pm - 4:20 pmPHL-SOF
15h 55m2 stops
$566American Airlines
Find Deal
Sun, Nov 9 - Sun, Nov 16
Air Canada Logo
2:00 pm - 2:47 pmSOF-PHL
31h 47m2 stops
Air Canada Logo
3:30 pm - 1:10 pmPHL-SOF
14h 40m2 stops
$657Air Canada
Find Deal
Thu, Jan 1 - Sun, Mar 1
United Airlines Logo
2:35 pm - 10:56 pmSOF-PHL
15h 21m2 stops
United Airlines Logo
5:40 pm - 1:35 pmPHL-SOF
12h 55m1 stop
$759United Airlines
Find Deal
Thu, Jan 1 - Sun, Mar 1
United Airlines Logo
2:35 pm - 10:56 pmSOF-PHL
15h 21m2 stops
United Airlines Logo
6:10 am - 10:45 pmPHL-SOF
33h 35m2 stops
$762United Airlines
Find Deal
Sun, Nov 9 - Sun, Nov 16
SWISS Logo
11:00 am - 9:21 pmSOF-PHL
41h 21m3 stops
SWISS Logo
12:40 pm - 6:20 pmPHL-SOF
22h 40m3 stops
$936SWISS
Find Deal
Sun, Nov 9 - Sun, Nov 16
SWISS Logo
11:00 am - 9:21 pmSOF-PHL
41h 21m3 stops
SWISS Logo
12:40 pm - 2:15 pmPHL-SOF
18h 35m2 stops
$946SWISS
Find Deal
Thu, Jan 1 - Sun, Mar 1
Multiple Airlines Logo
4:00 pm - 9:31 pmSOF-PHL
36h 31m2 stops
Multiple Airlines Logo
5:40 pm - 6:00 pmPHL-SOF
17h 20m1 stop
$954Multiple Airlines
Find Deal
Thu, Jan 1 - Sun, Mar 1
SWISS Logo
4:00 pm - 9:31 pmSOF-PHL
36h 31m2 stops
SWISS Logo
5:40 pm - 2:15 pmPHL-SOF
13h 35m2 stops
$977SWISS
Find Deal

Everything you should know

Top airlines
British Airways
Cheapest • from $564 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
March
Cheapest • 20% price drop
July
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$564
Overall average: $986
British Airways
Sun 11/9Sun 11/16
SOF - PHL • 1 stop
Cheapest one-way
$389
American Airlines
Sun 11/9
SOF - PHL • 1 stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Philadelphia!
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.

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.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Sofia to Philadelphia, 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 Sofia to Philadelphia is March, where tickets cost $581 (return) on average. On the other hand, the most expensive months are November and July, where the average cost of round-trip tickets is $986 and $814 respectively.

Good to know

Low seasonFebruary
Cheapest flight$389
Best time to beat the crowds with an average 19% drop in price.
Most popular time to fly with an average 12% 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 $389 for a one-way ticket and $564 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 $774 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 8929 reviews
7.1Entertainment
8.1Crew
7.7Boarding
6.6Food
7.3Comfort
Airline reviews

The newer screen was super cool and had the option to watch many different shows or movies. Crew was polite and helpful. However again, many children screaming bloody murder and kicking my seat, and parents doing nothing about it as usual.

6.0 GoodKaren Andrea, Sep 2025IAH - MCO
Read more United Airlines reviews

The newer screen was super cool and had the option to watch many different shows or movies. Crew was polite and helpful. However again, many children screaming bloody murder and kicking my seat, and parents doing nothing about it as usual.

Flight was good and crew was super polite. However, there were around 5 kids screaming the WHOLE 2 hours. I understand kids have to come but parents need to do something to control their children. They make the experience terrible, especially after finishing 16 hour shifts at the hospital I needed some sleep, which I did not get.

IAD with the archaic people movers is just a place to be avoided.

Overall, it was good. I was seating next to a wonderful lady and did not notice how time flew. Thanks

All of the United employees I interacted with were professional and courteous. The aircraft was clean, the food on the flight was good. No complaints here.

Armrest controller on my seat 35D and nextbooennseat 35E did not work right. Hard to press buttons to recognize and 35D had constantnpressure either upmost down somit was nearly impossible to make selections. .

I flew with my dog and had already purchased my dog’s ticket. Even that morning I had called costumer service to insure that my husband and I had seats together since the website was giving me an error when choosing our seats and the representative mentioned our dog. I showed up early to the airport and when I got to the gate and we started boarding I was help back and told that I was supposed to have a yellow tag and that I should have checked in at the counter for them to give me that tag. I was not aware of this, the representative on the phone did not say anything. Nor did I see it anywhere in the checking process online, so if you travel with a pet and are not checking in luggage, just know that you still have to go to the check in counter when arriving at the airport unless you want to be the last one to board and not have room for your carry on in the overhead bins. Other than that, I had a great experience.

Once we got in the air the pilot made up some of the time of the delay. So that was really nice.

My flight was delayed about 1 1/2 hours in Chicago, but other then that it was a good flight.

This is the best united airlines flight that I took. The crew was very friendly and the food was tasty!

Food could have something without dairy, I couldn't eat anything. Tv for both seats was malfunctioning. They have one bottle of ginger ale for entire plane.... and I paid extra for these seats...very disappointed

The flight and crew were good. The customer experience on the ground could have been better. We had to reschedule our flight because of a delay on the previous flight. The attendants working the desk in Washington DC were not helpful. They told us to scan a QR code and that would get us rebooked. Why couldn't two people standing at their computers do this? We had to chat with someone to get everything figured out. It was extremely confusing.

We took two long flights with Lufthansa, both were delayed making us miss our connecting flights. Lufthansa took care of the first one. The second was a switch to United and figuring out how to rebook was not a pleasant experience.

It was chaotic. It was overbooked so we didn't have seats until the end but they turned out to be good seats. The gate was at the end of the airport. We had to get busses to the tarmac and board. It just seemed chaotic. Flight was OK. Food was not so good. Lufthansa used to be such a great airline and now as it's with everything else: If you have money you get comforts but if you don't then you end up below deck with the rest of the cattle.

Welp - they boarded us appropriately...then had us sit on the plane for over two hours before cancelling the flight...which meant another night in Munich. I probably had it a little better than most as over 500 people had to be accommodated/re-booked etc. The next day I boarded the same flight (for which I had now been ticketed 3 straight days) and - with "only" an hour delay, managed to finally get home over 2 days later than scheduled. I haven't flown Lufthansa to Europe in years...and I won't be looking to do so again in the future. To be clear, though, the people I interacted with - flight crew, Service Center, check-in were all professional and courteous - management is clearly to blame for their lack of communication and unpreparedness for when things go wrong.

It was a short flight, everything was good with it.

Flight was delayed over one hour and I had to pay to select my seat, even though my booking supposedly had free selection (I paid extra for this at time of booking)

Both flights were delayed over 1 hour. And I had to pay for seats, even though my reservation supposedly included free seat selection.

The male attendant has zero personality. It seemed like he was over worked or hated his job, not once did he smile or made any contact with the people on the plane. Strictly business and call it a day!

Seat very cramped, could not recline. No cheese with meal. Staff very helpful.

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

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