Cheapest return flights from Istanbul to Sofia in September from 78€

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

Return flights

30 Sep - 04 Oct Pegasus Airlines direct
24 Sep - 27 Sep Pegasus Airlines direct
24 Sep - 25 Sep Pegasus Airlines direct
24 Sep - 26 Sep Pegasus Airlines direct
25 Sep - 26 Sep Pegasus Airlines direct
26 Sep - 29 Sep Pegasus Airlines direct
26 Sep - 30 Sep Pegasus Airlines direct
19 Sep - 24 Sep Pegasus Airlines direct
25 Sep - 30 Sep Pegasus Airlines direct
19 Sep - 25 Sep Pegasus Airlines direct
29 Sep - 01 Oct Pegasus Airlines direct
30 Sep - 07 Oct Pegasus Airlines direct
25 Sep - 27 Sep Pegasus Airlines direct
26 Sep - 03 Oct Pegasus Airlines direct
29 Sep - 04 Oct Pegasus Airlines direct
28 Sep - 10 Oct SKY express
28 Sep - 19 Oct SKY express
21 Sep - 10 Oct SKY express
26 Sep - 10 Oct SKY express
28 Sep - 12 Oct SKY express

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.

Book a cheap hotel in Sofia

Cheap car rent in Sofia

Feel free to contact us with any feedback or request another flight research.