Cheapest return flights from Istanbul to Sofia in September from $129

Best time to book flights for Istanbul (IST) to Sofia (SOF) flights at AirHint

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
06 Sep - 11 Sep Pegasus Airlines direct
01 Sep - 14 Sep Pegasus Airlines
04 Sep - 07 Sep Air Serbia
01 Sep - 14 Sep Pegasus Airlines direct
06 Sep - 07 Sep Pegasus Airlines direct
04 Sep - 07 Sep Turkish Airlines direct

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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