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

Return flights

15 Sep - 18 Sep	Ryanair
18 Sep - 21 Sep	Ryanair
29 Sep - 02 Oct	Ryanair
24 Sep - 30 Sep	KLM
24 Sep - 25 Sep	Ryanair
17 Sep - 21 Sep	Ryanair
30 Sep - 04 Oct	Ryanair
25 Sep - 28 Sep	Ryanair
28 Sep - 05 Oct	Ryanair
27 Sep - 05 Oct	Air France
26 Sep - 28 Sep	Ryanair
12 Sep - 15 Sep	Ryanair
13 Sep - 20 Sep	Croatia Airlines
13 Sep - 18 Sep	Turkish Airlines
22 Sep - 19 Oct	Air France

Also check the deals for one-way flights from Zagreb to Helsinki 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 Helsinki in September from $228

Return flights