AirHint found the following cheapest return flights from Graz (GRZ) to Zurich (ZRH) in September 2025 (see full year).

Return flights

18 Sep - 19 Sep	Austrian Airlines
11 Sep - 12 Sep	Austrian Airlines
17 Sep - 23 Sep	SWISS	direct
19 Sep - 22 Sep	SWISS	direct
26 Sep - 29 Sep	Austrian Airlines	direct
18 Sep - 22 Sep	SWISS	direct
29 Sep - 06 Oct	SWISS	direct
12 Sep - 22 Sep	Austrian Airlines	direct
12 Sep - 15 Sep	Austrian Airlines	direct
05 Sep - 08 Sep	SWISS	direct
22 Sep - 23 Sep	Austrian Airlines
28 Sep - 05 Oct	Lufthansa

Also check the deals for one-way flights from Graz to Zurich 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 Graz to Zurich in September from $227

Return flights