AirHint found the following cheapest one-way flights from Istanbul (IST) to Sofia (SOF) in October 2025 (see full year).

One-Way flights

02 Oct	Pegasus Airlines	direct
09 Oct	Pegasus Airlines	direct
07 Oct	Pegasus Airlines	direct
01 Oct	Pegasus Airlines	direct
03 Oct	Pegasus Airlines	direct
12 Oct	Pegasus Airlines	direct
14 Oct	Pegasus Airlines	direct
05 Oct	Pegasus Airlines	direct
25 Oct	Pegasus Airlines	direct
19 Oct	Pegasus Airlines	direct

Also check the deals for return flights from Istanbul to Sofia in October.

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 one-way flights from Istanbul to Sofia in October from 34€

One-Way flights