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

Return flights

01 Dec - 08 Dec	Pegasus Airlines	direct
08 Dec - 15 Dec	Pegasus Airlines	direct
11 Dec - 13 Dec	Pegasus Airlines	direct
11 Dec - 15 Dec	Pegasus Airlines	direct
22 Dec - 23 Dec	Pegasus Airlines	direct
13 Dec - 14 Dec	Pegasus Airlines	direct
07 Dec - 21 Dec	SKY express

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

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 December from $110

Return flights