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

Return flights

27 Sep - 30 Sep	Ryanair	direct
16 Sep - 30 Sep	Ryanair	direct
23 Sep - 30 Sep	Ryanair	direct
13 Sep - 16 Sep	Ryanair	direct
13 Sep - 30 Sep	Ryanair	direct
13 Sep - 23 Sep	Ryanair	direct
16 Sep - 20 Sep	Ryanair	direct
09 Sep - 16 Sep	Ryanair	direct
06 Sep - 09 Sep	Ryanair	direct
13 Sep - 20 Sep	Ryanair	direct
21 Sep - 01 Oct	Ryanair
29 Sep - 05 Oct	Austrian Airlines
26 Sep - 05 Oct	Austrian Airlines

Also check the deals for one-way flights from Zagreb to Kos 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 Kos in September from 76€

Return flights