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

Return flights

14 Sep - 19 Sep	Ryanair	direct
28 Sep - 01 Oct	Ryanair	direct
12 Sep - 19 Sep	Ryanair	direct
30 Sep - 03 Oct	Ryanair
19 Sep - 26 Sep	Ryanair	direct
30 Sep - 01 Oct	Ryanair
28 Sep - 05 Oct	Ryanair	direct
14 Sep - 21 Sep	Ryanair	direct
29 Sep - 01 Oct	Ryanair
26 Sep - 28 Sep	Ryanair	direct
12 Sep - 14 Sep	Ryanair	direct
17 Sep - 19 Sep	Ryanair
19 Sep - 23 Sep	Ryanair
19 Sep - 20 Sep	Ryanair
23 Sep - 26 Sep	Ryanair
30 Sep - 02 Oct	Ryanair
29 Sep - 02 Oct	Ryanair

Also check the deals for one-way flights from Zagreb to Sofia in September.

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 Zagreb to Sofia in September from $68

Return flights