Cheapest return flights from Istanbul to Sofia in September from $104

AirHint found the following cheapest return flights from Istanbul (IST) to Sofia (SOF) in September 2026 (see full year).

Return flights

22 Sep - 24 Sep Pegasus Airlines direct
27 Sep - 04 Oct Pegasus Airlines
23 Sep - 23 Sep Pegasus Airlines direct
20 Sep - 22 Sep Pegasus Airlines
19 Sep - 21 Sep Air Serbia
27 Sep - 04 Oct Pegasus Airlines direct
20 Sep - 04 Oct SKY express
20 Sep - 22 Sep Turkish Airlines direct
19 Sep - 21 Sep Turkish Airlines direct
25 Sep - 04 Oct SKY express
13 Sep - 04 Oct SKY express

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

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