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

Return flights

19 Sep - 22 Sep	transavia
18 Sep - 22 Sep	transavia
19 Sep - 21 Sep	transavia
26 Sep - 28 Sep	transavia
25 Sep - 28 Sep	transavia
11 Sep - 14 Sep	transavia
12 Sep - 14 Sep	transavia
04 Sep - 07 Sep	transavia
05 Sep - 08 Sep	transavia
14 Sep - 21 Sep	transavia
16 Sep - 02 Oct	transavia
29 Sep - 01 Oct	transavia
28 Sep - 03 Oct	transavia
28 Sep - 05 Oct	transavia

Also check the deals for one-way flights from Rotterdam to Dublin 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 Dublin in September from 179€

Return flights