AirHint found the following cheapest return flights from Rotterdam (RTM) to Geneva (GVA) in September 2025 (see full year).

Return flights

18 Sep - 02 Oct	Pegasus Airlines
15 Sep - 24 Sep	transavia
24 Sep - 29 Sep	transavia
18 Sep - 04 Oct	transavia
10 Sep - 17 Sep	transavia
10 Sep - 13 Sep	transavia
17 Sep - 19 Sep	transavia
17 Sep - 21 Sep	transavia
11 Sep - 14 Sep	Pegasus Airlines
18 Sep - 21 Sep	transavia
20 Sep - 04 Oct	transavia

Also check the deals for one-way flights from Rotterdam to Geneva 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 Rotterdam to Geneva in September from $264

Return flights