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

Return flights

28 Sep - 15 Oct	Ryanair	direct
28 Sep - 17 Oct	Ryanair	direct
28 Sep - 08 Oct	Ryanair	direct
28 Sep - 14 Oct	Ryanair
10 Sep - 24 Sep	Ryanair	direct
26 Sep - 15 Oct	Ryanair	direct
24 Sep - 14 Oct	Ryanair
24 Sep - 08 Oct	Ryanair	direct
28 Sep - 10 Oct	Ryanair	direct
28 Sep - 29 Sep	Ryanair
28 Sep - 01 Oct	Ryanair
10 Sep - 17 Sep	Ryanair	direct
26 Sep - 14 Oct	Ryanair
12 Sep - 17 Sep	Ryanair	direct
24 Sep - 29 Sep	Ryanair
03 Sep - 17 Sep	Ryanair	direct
28 Sep - 30 Sep	Ryanair
07 Sep - 17 Sep	Ryanair	direct
24 Sep - 24 Sep	Ryanair
10 Sep - 29 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 80€

Return flights