PHL - SOF

$544 Find Cheap Flights from Philadelphia to Sofia - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$544
Typical prices: $546-$1,003
British Airways
Fri 1/5Thu 1/11
PHL - SOF • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Philadelphia and Sofia. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to travel
November
Cheapest • 29% price drop
April
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Frankfurt am Main (FRA)
Cheapest • Avg $796 (round-trip)
London Heathrow (LHR)
Shortest trip • 13h 24m (one-way)
Insights
Insights
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Flight Deals

Cheap Flights from Philadelphia to Sofia (PHL-SOF)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Philadelphia to Sofia

Tue, Jan 5 - Mon, Jan 11
British Airways Logo
6:35 pm - 8:10 pmPHL  Philadelphia-SOF Sofia
18h 35m1 stop London Heathrow
British Airways Logo
5:15 pm - 4:15 pmSOF  Sofia-PHL Philadelphia
30h 00m1 stop London Heathrow
$544British Airways
Tue, Jan 5 - Mon, Jan 11
British Airways Logo
6:00 pm - 8:10 pmPHL  Philadelphia-SOF Sofia
19h 10m2 stops Boston Logan Intl London Heathrow
British Airways Logo
5:15 pm - 4:15 pmSOF  Sofia-PHL Philadelphia
30h 00m1 stop London Heathrow
$548British Airways
Tue, Jan 5 - Mon, Jan 11
British Airways Logo
6:00 pm - 8:10 pmPHL  Philadelphia-SOF Sofia
19h 10m2 stops Boston Logan Intl London Heathrow
British Airways Logo
5:15 pm - 7:10 pmSOF  Sofia-PHL Philadelphia
32h 55m2 stops London Heathrow Boston Logan Intl
$558British Airways
Tue, Jan 5 - Mon, Jan 11
British Airways Logo
6:35 pm - 8:10 pmPHL  Philadelphia-SOF Sofia
18h 35m1 stop London Heathrow
British Airways Logo
5:15 pm - 4:15 pmSOF  Sofia-PHL Philadelphia
30h 00m1 stop London Heathrow
$561British Airways
Tue, Oct 27 - Tue, Nov 3
United Airlines Logo
6:15 am - 1:15 pmPHL  Philadelphia-SOF Sofia
25h 00m2 stops Chicago O'Hare Intl Munich Franz Josef Strauss
United Airlines Logo
7:55 am - 11:31 pmSOF  Sofia-PHL Philadelphia
22h 36m2 stops Vienna Intl Washington, D.C. Dulles Intl
$598United Airlines
Tue, Oct 27 - Tue, Nov 3
United Airlines Logo
1:20 pm - 1:15 pmPHL  Philadelphia-SOF Sofia
17h 55m2 stops Chicago O'Hare Intl Munich Franz Josef Strauss
United Airlines Logo
6:25 am - 4:05 pmSOF  Sofia-PHL Philadelphia
16h 40m1 stop Frankfurt am Main
$599United Airlines
Tue, Oct 27 - Tue, Nov 3
Lufthansa Logo
6:40 pm - 1:25 pmPHL  Philadelphia-SOF Sofia
12h 45m1 stop Frankfurt am Main
Lufthansa Logo
6:25 am - 4:05 pmSOF  Sofia-PHL Philadelphia
16h 40m1 stop Frankfurt am Main
$606Lufthansa
Wed, Jan 6 - Tue, Jan 12
United Airlines Logo
10:15 am - 11:50 amPHL  Philadelphia-SOF Sofia
18h 35m2 stops Washington, D.C. Dulles Intl Vienna Intl
United Airlines Logo
7:55 am - 1:51 pmSOF  Sofia-PHL Philadelphia
36h 56m2 stops Vienna Intl Washington, D.C. Dulles Intl
$612United Airlines
Tue, Jan 5 - Tue, Jan 12
Lufthansa Logo
5:40 pm - 1:25 pmPHL  Philadelphia-SOF Sofia
12h 45m1 stop Frankfurt am Main
Lufthansa Logo
6:25 am - 4:05 pmSOF  Sofia-PHL Philadelphia
16h 40m1 stop Frankfurt am Main
$620Lufthansa
Tue, Jan 5 - Thu, Jan 14
Lufthansa Logo
5:40 pm - 1:25 pmPHL  Philadelphia-SOF Sofia
12h 45m1 stop Frankfurt am Main
Lufthansa Logo
6:25 am - 4:05 pmSOF  Sofia-PHL Philadelphia
16h 40m1 stop Frankfurt am Main
$620Lufthansa
Booking Insights

Price, demand and travel trends for Philadelphia to Sofia flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights from Philadelphia to Sofia with more confidence.

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

Round-trip flights from Philadelphia to Sofia start at $544. Prices are below average for this route right now, with typical round-trip fares ranging from $546 to $1,003. The lowest price found in the past 5 days was $544 on British Airways.

What's the cheapest day of the week to fly from Philadelphia to Sofia?

Thursday is the cheapest day of the week to fly from Philadelphia to Sofia, it is 25% cheaper than the average day. Monday is the most expensive day with flight prices 40% higher than average. Based on deals found by KAYAK users in the last 12 months.

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

  • November is the cheapest month to fly from Philadelphia to Sofia at $540 round-trip.
  • May ($1,176) and December ($995) are the most expensive months.
  • The price difference between flying in the cheapest and most expensive months is 117% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

Find deals

Key details for Philadelphia to Sofia flights

Low season

January
Best time to beat the crowds with an average 9% drop in price.
Most popular time to fly and prices are also 14% lower on average.

When to book flights from Philadelphia to Sofia

Are your dates flexible? Find out the best times to travel from Philadelphia to Sofia based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Your Philadelphia to Sofia flight questions, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines and booking questions.

  • Which airports can I use when flying from Philadelphia to Sofia?

    Flights from Philadelphia to Sofia usually depart from Philadelphia (PHL) and arrive at Sofia (SOF).

  • What cabin classes can I book on flights from Philadelphia to Sofia?

    Only Economy Class is available on flights from Philadelphia to Sofia.

  • Which airports do connecting flights from Philadelphia to Sofia pass through?

    Connecting flights from Philadelphia to Sofia most commonly pass through:

    • Frankfurt am Main (FRA) - 98% of one-stop connections
    • London Heathrow (LHR) - 2% of one-stop connections
    Together, these airports account for 100% of one-stop bookings on this route.

  • Can I save money by using flexible dates for flights from Philadelphia to Sofia?

    Yes. Being flexible with your travel dates can save you up to 47% on the Philadelphia to Sofia route. Thursday is the cheapest departure day at $573 round-trip on average, while Monday is the most expensive at $1,063, a difference of $490. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • What popular places can I visit in Sofia?

    Some of the most popular sights in Sofia are Sofia City Centre, The St. Alexander Nevsky Cathedral and Vitosha Boulevard. These are among the most viewed places in Sofia on KAYAK.

  • How long is a flight from Philadelphia to Sofia?

    A nonstop flight from Philadelphia to Sofia takes 0h 00m, covering 4,800 miles.

  • Do I need a passport to fly from Philadelphia to Sofia?

    Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

  • Have flight prices from Philadelphia to Sofia changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $544 to $4,607. That means the highest observed fare was about 8x higher than the lowest one.

  • How much time can I save by choosing a different layover airport from Philadelphia to Sofia?

    Flying via London Heathrow (LHR) gives the shortest average 1-stop total travel time at 13h 24m, compared with 15h 18m via Frankfurt am Main (FRA).

  • What is the time difference between Philadelphia and Sofia?

    Sofia is 7 hours ahead of Philadelphia (Eastern European Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.

  • What car rental options are available at Sofia Airport (SOF)?

    Sofia Airport (SOF) hosts 5 major car rental companies, with daily rates starting from around $1 for economy cars. Top options include:
    • MEXRENTACAR
    • Easyrent
    • Top Rent a Car - Bulgaria
    • NU Car
    • Priceless

  • How much should I expect to pay for a Philadelphia to Sofia flight?

    Round-trip flights from Philadelphia to Sofia range from $546 to $1,003, with an average of $759 over the past 12 months. Anything below $546 counts as a good deal.

Your guide to booking Philadelphia to Sofia flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates can be flexible, aim for a Thursday departure instead of Monday. On this route, Thursday flights average $573 - about $490 less than Monday (46% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Philadelphia to Sofia trip for November. Fares historically average $540 round-trip in that month - typically $636 less than the most expensive month, which is May (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Sofia Airport.
    - Hotel Premier Airport Sofia
    - ibis Sofia Airport
    - Avel Guest House

More options for your flight from Philadelphia to Sofia

Complete your trip to Sofia with a hotel stay or car rental

Car rentals in Sofia
Hotels in Sofia
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