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

Return flights

07 Sep - 10 Sep	Ryanair	direct
07 Sep - 24 Sep	Ryanair
07 Sep - 23 Sep	Ryanair
03 Sep - 10 Sep	Ryanair
28 Sep - 08 Oct	Ryanair
17 Sep - 24 Sep	Ryanair
08 Sep - 10 Sep	Ryanair
16 Sep - 24 Sep	easyJet
29 Sep - 08 Oct	easyJet
29 Sep - 07 Oct	easyJet
02 Sep - 10 Sep	Norwegian Air Sweden AOC	direct
29 Sep - 06 Oct	Ryanair
17 Sep - 23 Sep	Ryanair
28 Sep - 09 Oct	Ryanair
08 Sep - 24 Sep	Ryanair
28 Sep - 14 Oct	Ryanair	direct
28 Sep - 02 Oct	Ryanair
26 Sep - 03 Oct	easyJet
28 Sep - 01 Oct	Ryanair
30 Sep - 08 Oct	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 111€

Return flights