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

Return flights

02 Sep - 06 Sep	transavia	direct
02 Sep - 07 Sep	transavia	direct
07 Sep - 10 Sep	transavia	direct
10 Sep - 17 Sep	transavia	direct
07 Sep - 16 Sep	transavia	direct
29 Sep - 04 Oct	transavia
20 Sep - 02 Oct	transavia
06 Sep - 13 Sep	transavia	direct
29 Sep - 04 Oct	transavia	direct
23 Sep - 29 Sep	transavia
08 Sep - 18 Sep	transavia
20 Sep - 02 Oct	transavia	direct
03 Sep - 19 Sep	transavia	direct
28 Sep - 05 Oct	transavia
23 Sep - 29 Sep	transavia	direct

Also check the deals for one-way flights from Rotterdam to Gerona 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 Gerona in September from $183

Return flights