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

Return flights

28 Sep - 06 Oct	Ryanair
28 Sep - 01 Oct	Ryanair	direct
28 Sep - 09 Oct	Ryanair
29 Sep - 07 Oct	easyJet
30 Sep - 01 Oct	Norwegian Air Sweden AOC	direct
29 Sep - 02 Oct	easyJet
28 Sep - 08 Oct	Ryanair
28 Sep - 30 Sep	Ryanair
24 Sep - 01 Oct	Ryanair
27 Sep - 01 Oct	Ryanair
29 Sep - 06 Oct	Ryanair
10 Sep - 17 Sep	Wizz Air
07 Sep - 17 Sep	Ryanair	direct
23 Sep - 25 Sep	easyJet
22 Sep - 24 Sep	Ryanair
23 Sep - 30 Sep	easyJet
24 Sep - 27 Sep	Ryanair
22 Sep - 25 Sep	Ryanair
24 Sep - 30 Sep	Ryanair
20 Sep - 27 Sep	Vueling Airlines

Also check the deals for one-way flights from Copenhagen 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 Copenhagen to Porto in September from 113€

Return flights