AirHint found the following cheapest return flights from Duesseldorf (DUS) to Porto (OPO) in September 2025 (see full year).

Return flights

26 Sep - 15 Oct	Ryanair	direct
26 Sep - 30 Sep	Ryanair
26 Sep - 14 Oct	Ryanair
26 Sep - 10 Oct	Ryanair	direct
28 Sep - 17 Oct	Ryanair	direct
26 Sep - 08 Oct	Ryanair	direct
28 Sep - 15 Oct	Ryanair	direct
24 Sep - 30 Sep	Ryanair
29 Sep - 31 Oct	Ryanair
26 Sep - 01 Oct	Ryanair
28 Sep - 30 Sep	Ryanair
26 Sep - 13 Oct	Ryanair
29 Sep - 30 Oct	Ryanair
26 Sep - 29 Sep	Ryanair
17 Sep - 30 Sep	Ryanair
15 Sep - 30 Sep	Vueling Airlines
20 Sep - 23 Sep	Ryanair
14 Sep - 30 Sep	Ryanair
22 Sep - 30 Sep	Vueling Airlines
11 Sep - 19 Sep	Ryanair

Also check the deals for one-way flights from Duesseldorf to Porto 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 Duesseldorf to Porto in September from 88€

Return flights