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

Return flights

24 Sep - 17 Oct	Ryanair	direct
10 Sep - 22 Sep	Ryanair
24 Sep - 08 Oct	Ryanair	direct
10 Sep - 17 Sep	Ryanair	direct
24 Sep - 29 Sep	Ryanair
10 Sep - 29 Sep	Ryanair
24 Sep - 30 Sep	Ryanair
24 Sep - 14 Oct	Ryanair
24 Sep - 01 Oct	Ryanair
24 Sep - 24 Sep	Ryanair
10 Sep - 24 Sep	Ryanair	direct
10 Sep - 30 Sep	Ryanair
17 Sep - 22 Sep	Ryanair
21 Sep - 22 Sep	Ryanair
30 Sep - 17 Oct	Vueling Airlines
28 Sep - 08 Oct	Ryanair	direct
21 Sep - 08 Oct	Ryanair	direct
29 Sep - 13 Oct	easyJet
30 Sep - 15 Oct	Vueling Airlines
29 Sep - 09 Oct	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 98€

Return flights