Cheapest return flights from Istanbul to Sofia in September from $92

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

Return flights

25 Sep - 27 Sep Pegasus Airlines direct
26 Sep - 28 Sep Pegasus Airlines direct
18 Sep - 23 Sep Pegasus Airlines direct
16 Sep - 23 Sep Pegasus Airlines direct
24 Sep - 28 Sep Pegasus Airlines direct
26 Sep - 03 Oct Pegasus Airlines direct
25 Sep - 02 Oct Pegasus Airlines direct
26 Sep - 30 Sep Pegasus Airlines direct
18 Sep - 22 Sep Pegasus Airlines direct
04 Sep - 11 Sep Pegasus Airlines direct
22 Sep - 26 Sep Pegasus Airlines direct
12 Sep - 18 Sep Pegasus Airlines direct
29 Sep - 01 Oct Pegasus Airlines direct
24 Sep - 03 Oct Pegasus Airlines direct
26 Sep - 10 Oct Pegasus Airlines direct
02 Sep - 14 Oct Pegasus Airlines direct
27 Sep - 04 Oct Pegasus Airlines direct
22 Sep - 03 Oct Turkish Airlines direct
19 Sep - 03 Oct SKY express
28 Sep - 19 Oct SKY express

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

Skyscanner

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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