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

One-Way flights

18 Oct	Pegasus Airlines	direct
08 Oct	Pegasus Airlines	direct
21 Oct	Pegasus Airlines	direct
25 Oct	Pegasus Airlines	direct
07 Oct	Pegasus Airlines	direct
04 Oct	Pegasus Airlines	direct
03 Oct	Pegasus Airlines	direct
10 Oct	Pegasus Airlines	direct
05 Oct	Turkish Airlines	direct
22 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.

Book a cheap hotel in Sofia

Cheap car rent in Sofia

Cheapest one-way flights from Istanbul to Sofia in October from $46

One-Way flights