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

Return flights

09 Jan - 11 Jan	Pegasus Airlines	direct
01 Jan - 03 Jan	Pegasus Airlines
29 Jan - 05 Feb	Pegasus Airlines	direct
02 Jan - 05 Jan	Pegasus Airlines	direct
23 Jan - 27 Jan	Pegasus Airlines	direct
21 Jan - 25 Jan	Pegasus Airlines
21 Jan - 25 Jan	Turkish Airlines	direct
02 Jan - 04 Jan	SKY express

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

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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Cheapest return flights from Istanbul to Sofia in January from $113

Return flights