SOF - PHL

$550 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 5/11. 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

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 Flight Deals 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.

Recent round-trip flight deals from Sofia to Philadelphia

KAYAK's recommended round-trip deals from the most popular airlines that fly from Sofia to Philadelphia.
Discover the best prices for you by selecting your travel dates on KAYAK.
British Airways Logo
9:10 pm - 4:25 pmSOF-PHL
26h 15m1 stop
British Airways Logo
7:55 pm - 8:20 pmPHL-SOF
17h 25m1 stop
$550British Airways
Find Deal
Sun, May 11 - Sat, May 24
 Logo
7:00 am - 8:55 pmSOF-PHL
20h 55m2 stops
 Logo
1:00 pm - 2:00 pmPHL-SOF
18h 00m2 stops
Sat, May 10 - Sat, May 24
 Logo
7:00 am - 5:17 pmSOF-PHL
17h 17m2 stops
 Logo
1:00 pm - 2:00 pmPHL-SOF
18h 00m2 stops
Sun, May 11 - Sat, May 24
United Airlines Logo
6:20 am - 4:00 pmSOF-PHL
16h 40m1 stop
United Airlines Logo
10:35 am - 11:15 amPHL-SOF
17h 40m2 stops
$643United Airlines
Find Deal
Sun, May 11 - Sun, May 25
Lufthansa Logo
6:20 am - 4:00 pmSOF-PHL
16h 40m1 stop
Lufthansa Logo
5:35 pm - 10:50 pmPHL-SOF
22h 15m1 stop
$661Lufthansa
Find Deal
Sun, May 11 - Fri, May 23
United Airlines Logo
6:15 am - 10:06 pmSOF-PHL
22h 51m2 stops
United Airlines Logo
5:35 pm - 10:50 pmPHL-SOF
22h 15m1 stop
$665United Airlines
Find Deal
Fri, Jun 13 - Fri, Jun 20
Austrian Airlines Logo
8:00 am - 10:28 pmSOF-PHL
21h 28m2 stops
Austrian Airlines Logo
5:35 pm - 3:20 pmPHL-SOF
14h 45m2 stops
$679Austrian Airlines
Find Deal
Sat, May 10 - Fri, May 23
Lufthansa Logo
6:15 am - 4:00 pmSOF-PHL
16h 45m1 stop
Lufthansa Logo
5:35 pm - 10:50 pmPHL-SOF
22h 15m1 stop
$689Lufthansa
Find Deal
Fri, Jun 13 - Fri, Jun 20
United Airlines Logo
8:00 am - 9:23 pmSOF-PHL
20h 23m2 stops
United Airlines Logo
5:35 pm - 1:25 pmPHL-SOF
12h 50m1 stop
$710United Airlines
Find Deal
Sat, May 10 - Fri, May 23
Qatar Airways Logo
1:30 pm - 9:00 amSOF-PHL
26h 30m1 stop
Qatar Airways Logo
8:45 pm - 12:30 pmPHL-SOF
32h 45m1 stop
$4,014Qatar Airways
Find Deal
Sat, May 10 - Sat, May 24
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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 seasonApril
Cheapest flight$550
Best time to beat the crowds with an average 24% 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 $550 for a round-trip ticket.

  • 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 $786 and an overall rating of 6.7.

  • 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 8696 reviews
7.3Comfort
7.7Boarding
6.6Food
8.1Crew
7.1Entertainment
Airline reviews

Our flights got changed from United to Air Canada and our purchased seats did not get transferred so we had to pay for seats twice. I brought it up with Air Canada and they stated I had to go back and chase it with United. The united seats were $21 Canadian each and Air Canada were $56 each so we have paid $77 for each seat. Very unhappy

2.0 MediocreBrant, Apr 2025YHZ - EWR
Read more United Airlines reviews

Our flights got changed from United to Air Canada and our purchased seats did not get transferred so we had to pay for seats twice. I brought it up with Air Canada and they stated I had to go back and chase it with United. The united seats were $21 Canadian each and Air Canada were $56 each so we have paid $77 for each seat. Very unhappy

A bit rush for transit. Food and entertainment are not available

So far so good but food and entertainment are not available for this flight

Multiple delays and not straight answer from the United team

Stewardess spilled orange juice on my clothes/seat no help no apology just threw napkins at me to clean the mess up. Not Happy.

Smooth flight. Boarding was chaotic. Could not hear the gate agent over the intercom. People were lined up in the wrong lines. Groups one and two were told to board through line one and group 3 through line 2. All very confusing. Once in the air, the flight was smooth. There was no entertainment option on this aircraft, even though it was a larger aircraft.

The plane pushed back from the gate on time. However, it stopped on the ramp, and we waited for over 20 minutes before the aircraft pulled back to the gate. Apparently, something of importance had to be removed from the aircraft by the gate agent. I found this to be odd. The delay was not significant, but I felt that whatever was on the aircraft that had to be taken off, should’ve been done before we pushed back from the gate.

Electric plugs didn't work. Entertainment system wasn't working

The design of the light switch on the arm rest is ridiculous.

Smooth boarding process. Early departure, smooth flight, early arrival. The entertainment package has very good recent movie options. The flight crew were friendly and professional.

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.

Food was great but they didn't clear my meal tray for 3 hours. You'd think they could check though the cabin now and then.

Upon arriving at IAH, it was informed that the luggage had not arrived. Still waiting to hear back when it will be delivered.

I wasn’t allowed to board with my children. I was charged outrageous costs for basic carry on size luggage. The entertainment screens were outdated and not user friendly.

I was very happy with everything, thank you for the smooth flight ✈️

helpful and friendly. The Lufthanza people I dealt with before my holiday were so unhelpful by comparison.

I enjoyed my flight back with Lufthansa because the food was good, and the flight attendants were nice and helped you when you asked a question. The flight attendants always came around and asked if you needed anything which I liked a lot.

Entertainment system is old. Food can be tastier Need to provide toothbrush and toothpaste at least when asked.

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

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