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

Return flights

27 Sep - 15 Oct	Ryanair
24 Sep - 15 Oct	Ryanair
29 Sep - 15 Oct	Vueling Airlines
29 Sep - 20 Oct	easyJet
30 Sep - 15 Oct	Vueling Airlines
27 Sep - 16 Oct	Vueling Airlines
30 Sep - 14 Oct	Vueling Airlines
25 Sep - 10 Oct	Ryanair
24 Sep - 30 Sep	Vueling Airlines
29 Sep - 13 Oct	Vueling Airlines
29 Sep - 17 Oct	Vueling Airlines
27 Sep - 30 Sep	Ryanair
25 Sep - 26 Sep	Ryanair
22 Sep - 24 Sep	Eurowings
29 Sep - 30 Sep	Vueling Airlines
24 Sep - 25 Sep	Ryanair
24 Sep - 24 Sep	Vueling Airlines
24 Sep - 26 Sep	Vueling Airlines
27 Sep - 29 Sep	Ryanair
22 Sep - 29 Sep	easyJet

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 121€

Return flights