SOF - PHL

$585 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 9/4. 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

Thu, Sep 4 - Mon, Sep 8
Lufthansa Logo
6:15 am - 4:00 pmSOF-PHL
16h 45m1 stop
Lufthansa Logo
5:35 pm - 5:50 pmPHL-SOF
17h 15m1 stop
$585Lufthansa
Find Deal
Thu, Sep 4 - Mon, Sep 8
United Airlines Logo
6:15 am - 4:00 pmSOF-PHL
16h 45m1 stop
United Airlines Logo
3:25 pm - 10:50 pmPHL-SOF
24h 25m2 stops
$589United Airlines
Find Deal
Thu, Sep 4 - Mon, Sep 8
United Airlines Logo
6:15 am - 12:21 amSOF-PHL
25h 06m2 stops
United Airlines Logo
3:25 pm - 10:50 pmPHL-SOF
24h 25m2 stops
$599United Airlines
Find Deal
Tue, Aug 26 - Tue, Sep 2
Lufthansa Logo
2:00 pm - 5:10 pmSOF-PHL
34h 10m1 stop
Lufthansa Logo
5:35 pm - 5:50 pmPHL-SOF
17h 15m1 stop
$605Lufthansa
Find Deal
Tue, Aug 26 - Tue, Sep 2
Lufthansa Logo
6:35 pm - 5:10 pmSOF-PHL
29h 35m1 stop
Lufthansa Logo
5:35 pm - 5:50 pmPHL-SOF
17h 15m1 stop
$609Lufthansa
Find Deal
Tue, Aug 26 - Tue, Sep 2
United Airlines Logo
2:00 pm - 5:10 pmSOF-PHL
34h 10m1 stop
United Airlines Logo
7:58 pm - 5:50 pmPHL-SOF
14h 52m2 stops
$610United Airlines
Find Deal
Tue, Aug 26 - Tue, Sep 2
United Airlines Logo
2:00 pm - 5:10 pmSOF-PHL
34h 10m1 stop
United Airlines Logo
6:30 am - 12:00 pmPHL-SOF
22h 30m2 stops
$611United Airlines
Find Deal
Tue, Aug 26 - Tue, Sep 2
Austrian Airlines Logo
6:55 pm - 5:10 pmSOF-PHL
29h 15m2 stops
Austrian Airlines Logo
5:35 pm - 3:20 pmPHL-SOF
14h 45m2 stops
$676Austrian Airlines
Find Deal
Tue, Aug 26 - Tue, Sep 2
Austrian Airlines Logo
6:55 pm - 5:10 pmSOF-PHL
29h 15m2 stops
Austrian Airlines Logo
5:35 pm - 3:20 pmPHL-SOF
14h 45m2 stops
$680Austrian Airlines
Find Deal
Fri, Aug 15 - Thu, Sep 4
British Airways Logo
2:20 pm - 4:25 pmSOF-PHL
33h 05m1 stop
British Airways Logo
6:30 pm - 1:30 pmPHL-SOF
12h 00m1 stop
$928British Airways
Find Deal
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?

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$585
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 $585 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?

    Star Alliance, and oneworld 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 $773 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 8896 reviews
7.7Boarding
6.6Food
7.1Entertainment
7.3Comfort
8.1Crew
Airline reviews

Was on time until within 1 hour of flight-how does that happen? Staff very friendly.

8.0 ExcellentHal, Jul 2025IAD - MSY
Read more United Airlines reviews

Was on time until within 1 hour of flight-how does that happen? Staff very friendly.

Had one staff that was not pleasant. Seems they are stressed with too many people to care for.

Weather delay in Chicago?. No sense of urgency to make connection in Chicago for our connecting flight that wasn't delayed. Connection was missed.

Ok. Get a different kosher caterer. The food was odd.

Food was terrible. Crew was kind but skipped over my row for providing sandwiches and beverages.

Our flight was understandably diverted to a small regional airport in Laramie, Wyoming due to weather conditions, which I fully recognize and appreciate. However, the low rating stems from the experience that followed: passengers remained on board for over an hour without the option to deplane and stretch, despite the aircraft being stationary. Although the pilot opened the cabin door, only he was permitted to exit. Meanwhile, passengers grew increasingly uncomfortable as warm summer air entered the cabin through the open door, and being in the second row meant we were impacted immediately. While the flight attendants made efforts to keep everyone at ease, I believe allowing passengers to deplane briefly, given the extended delay, would have significantly improved the overall experience.

I never flew. Flight was canceled. DIA worst airport in the country. Avoid at all costs.

Lost luggage, they need a baggage service representative available all times in Atlanta

Our experience on United Airlines was extremely poor. The plane was extremely cold throughout our entire flight- which multiple people complained about- and we had to wait 2 hours to get a blanket which was too thin and barely helped warm us up. As well as this, none of the entertainment features were working so we had to sit through a roughly 10 hour flight with nothing to keep our attention, including the actual flight path screen. It was an extremely disappointing experience and I would hope that this gets fixed if we ever choose United Airlines again.

I really enjoyed flying with United airlines amazing experience , good customer service and great food

Insulting. Lufthansa flight from Munich to EWR had us getting our luggage when we were told in Florence that it would follow us to Indianapolis. It did not. Then very slow security in EWR caused me and three other passengers from Lufthansa flight from Munich to miss the boarding closure. Behind me were two elderly grandparents and their ten year old grandson. We were all refused entry on a plane to Indy that was still at the gate. The doors had not even closed inside the terminal yet. No apologies or compensation offered. Not even a meal voucher let alone a free hotel stay for our inconvenience. I m not sure what the other three passengers behind me did ( they were elderly with a grandson, recall), but I stated 12 hours overnight in a chilly EWR airport until next flight to Indy at 850 next morning.

I was told in Florence my bag would go directly to Indianapolis. I had to wait to get it. Then security in EWR was slow so I missed my flight as United would not allow me on the plane even though it was still on the tarmac and the door to the tunnel was open. I blame both Lufthansa and United for refusing to allow me on board a plane that was clearly still on the tarmac. Behind me two grandparents and their ten year old grandson were on same flight from Munich to EWR. They were refused to board the United flight. So we had to sit for 12 hours in airport until next flight. No compensation has been offered either by Lufthansa or United.

Flight was delayed and luggage was delivered day after arrival. In Bilbao they told me day after would be delivered faster if I went to Bilbao to get my own bags so I did. Wasted my morning.

Seating was average for a first class seat. It very modern. I expected better.

very small seats screen did not work . I could not watch anything for 9 hours

The food that was served was superb!!! Awesome snacks!!! Frequent drink service!!! To me, this was shocking. I took a British Airways flight from Denver to London for the first leg of my trip and the food was horrendous. Thank you for keeping us fed and satiated on such a long flight!!!!

The seating arrangement by having privacy screens would have been more appealing. If you sit in the business class, you pay for extra comfort and privacy. Other than that, the service was excellent and the staff very professional.

Best flight attendants ever! Very customer and service oriented, courteous, professional and helpful.

Flights were delayed but very last minute, also seats felt very squished on the second flight. Crew was very friendly and airplane was clean.

I darted through the Frankfurt airport to make my connecting flight. I asked if it was a possibility to upgrade and the agent did. This was the kindest gesture and it made up for the previous delayed flight and distress/anxiety of anticipating that Zi was going to miss my Frankfurt-Chicago connection. I cannot express my gratitude for the upgrade.. I am 5feet 10 inches do the leg space was amazing.

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

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