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

Return flights

15 Sep - 18 Sep	transavia	direct
15 Sep - 17 Sep	transavia	direct
03 Sep - 11 Sep	transavia	direct
16 Sep - 18 Sep	transavia
15 Sep - 24 Sep	transavia	direct
21 Sep - 24 Sep	transavia	direct
13 Sep - 18 Sep	transavia	direct
14 Sep - 16 Sep	transavia
03 Sep - 10 Sep	transavia
28 Sep - 08 Oct	transavia	direct
28 Sep - 07 Oct	transavia
17 Sep - 20 Sep	transavia
21 Sep - 01 Oct	transavia
29 Sep - 08 Oct	transavia	direct
27 Sep - 03 Oct	transavia
08 Sep - 01 Oct	transavia
27 Sep - 07 Oct	transavia
21 Sep - 01 Oct	transavia	direct
27 Sep - 06 Oct	transavia
08 Sep - 01 Oct	transavia	direct

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 146€

Return flights