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

Return flights

30 Sep - 14 Oct	Eurowings	direct
29 Sep - 01 Oct	easyJet
30 Sep - 02 Oct	Eurowings
25 Sep - 30 Sep	Ryanair
28 Sep - 02 Oct	Ryanair
28 Sep - 08 Oct	Ryanair	direct
20 Sep - 25 Sep	Ryanair
28 Sep - 01 Oct	Ryanair
27 Sep - 02 Oct	Ryanair
27 Sep - 30 Sep	Ryanair
22 Sep - 28 Sep	easyJet
15 Sep - 18 Sep	easyJet
20 Sep - 24 Sep	Ryanair
29 Sep - 02 Oct	easyJet
20 Sep - 23 Sep	Ryanair
21 Sep - 24 Sep	Ryanair	direct
22 Sep - 29 Sep	easyJet
25 Sep - 02 Oct	Ryanair
24 Sep - 25 Sep	Vueling Airlines
24 Sep - 01 Oct	Vueling Airlines

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 $148

Return flights