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

Return flights

25 Sep - 28 Sep	Ryanair
18 Sep - 29 Sep	Ryanair
18 Sep - 22 Sep	Ryanair
24 Sep - 05 Oct	Vueling Airlines
24 Sep - 29 Sep	Vueling Airlines
29 Sep - 04 Oct	Ryanair
25 Sep - 27 Sep	Ryanair
23 Sep - 28 Sep	Vueling Airlines
17 Sep - 24 Sep	transavia	direct
22 Sep - 25 Sep	Vueling Airlines
18 Sep - 21 Sep	Ryanair
20 Sep - 22 Sep	Ryanair
24 Sep - 05 Oct	transavia	direct
29 Sep - 04 Oct	transavia	direct
15 Sep - 02 Oct	Vueling Airlines
28 Sep - 01 Oct	TAP
28 Sep - 01 Oct	transavia	direct
29 Sep - 01 Oct	transavia	direct
06 Sep - 11 Oct	Vueling Airlines
29 Sep - 02 Oct	transavia	direct

Also check the deals for one-way flights from Lisbon to Rotterdam 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 Lisbon to Rotterdam in September from $256

Return flights