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

Return flights

23 Sep - 24 Sep	Ryanair
26 Sep - 29 Sep	Air Serbia	direct
25 Sep - 26 Sep	Air Serbia	direct
24 Sep - 29 Sep	Air Serbia	direct
25 Sep - 29 Sep	Air Serbia	direct
27 Sep - 29 Sep	Air Serbia	direct
24 Sep - 25 Sep	Air Serbia	direct
20 Sep - 22 Sep	Ryanair
24 Sep - 27 Sep	Air Serbia	direct
11 Sep - 13 Sep	Ryanair
20 Sep - 02 Oct	Ryanair
25 Sep - 02 Oct	Ryanair
25 Sep - 02 Oct	Air Serbia	direct
20 Sep - 02 Oct	Air Serbia	direct

Also check the deals for one-way flights from Zagreb to Belgrade 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 Belgrade in September from $123

Return flights