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

Return flights

27 Sep - 02 Oct	transavia
22 Sep - 25 Sep	transavia
27 Sep - 06 Oct	transavia
27 Sep - 03 Oct	transavia
28 Sep - 02 Oct	transavia
26 Sep - 02 Oct	transavia
20 Sep - 25 Sep	transavia
20 Sep - 03 Oct	transavia
28 Sep - 13 Oct	transavia
30 Sep - 07 Oct	transavia
29 Sep - 02 Oct	transavia
27 Sep - 04 Oct	transavia
21 Sep - 25 Sep	transavia
20 Sep - 22 Sep	transavia
19 Sep - 23 Sep	transavia
19 Sep - 22 Sep	transavia
20 Sep - 24 Sep	transavia
17 Sep - 25 Sep	transavia
27 Sep - 29 Sep	transavia
14 Sep - 23 Sep	transavia

Also check the deals for one-way flights from Rotterdam to Lisbon 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 Lisbon in September from $187

Return flights