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

Return flights

28 Sep - 05 Oct	Austrian Airlines
15 Sep - 25 Sep	Austrian Airlines
20 Sep - 22 Sep	Austrian Airlines
19 Sep - 22 Sep	Austrian Airlines
06 Sep - 08 Sep	Austrian Airlines
19 Sep - 20 Sep	Austrian Airlines
18 Sep - 21 Sep	Austrian Airlines
28 Sep - 04 Oct	Austrian Airlines
01 Sep - 06 Sep	Austrian Airlines
01 Sep - 05 Sep	Austrian Airlines
02 Sep - 04 Sep	Eurowings
21 Sep - 24 Sep	Eurowings

Also check the deals for one-way flights from Graz to Amsterdam 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 Amsterdam in September from $300

Return flights