Cheapest return flights from Istanbul to Sofia in September from $103

AirHint found the following cheapest return flights from Istanbul (IST) to Sofia (SOF) in September 2025 (see full year).

Return flights

16 Sep - 23 Sep Pegasus Airlines direct
12 Sep - 16 Sep Pegasus Airlines direct
12 Sep - 19 Sep Pegasus Airlines direct
09 Sep - 10 Sep Pegasus Airlines direct
30 Sep - 01 Oct Pegasus Airlines direct
10 Sep - 12 Sep Pegasus Airlines direct
04 Sep - 08 Sep Turkish Airlines direct
11 Sep - 16 Sep Turkish Airlines direct
02 Sep - 09 Sep Pegasus Airlines direct
19 Sep - 22 Sep Pegasus Airlines direct
05 Sep - 12 Sep Pegasus Airlines direct
22 Sep - 03 Oct Turkish Airlines direct
25 Sep - 02 Oct Pegasus Airlines direct

Also check the deals for one-way flights from Istanbul to Sofia in September.

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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