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

Return flights

21 Sep - 09 Oct	transavia	direct
10 Sep - 12 Sep	transavia
10 Sep - 17 Sep	transavia
28 Sep - 04 Oct	transavia
29 Sep - 04 Oct	transavia
04 Sep - 11 Sep	transavia
15 Sep - 18 Sep	transavia
25 Sep - 01 Oct	transavia	direct
26 Sep - 02 Oct	transavia
17 Sep - 20 Sep	transavia
04 Sep - 08 Sep	transavia
12 Sep - 24 Sep	transavia
06 Sep - 08 Sep	transavia
27 Sep - 02 Oct	transavia
08 Sep - 11 Sep	transavia
08 Sep - 10 Sep	transavia
27 Sep - 02 Oct	transavia	direct
28 Sep - 04 Oct	transavia	direct
29 Sep - 04 Oct	transavia	direct
26 Sep - 04 Oct	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 $170

Return flights