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

Return flights

10 Sep - 28 Sep	Ryanair	direct
10 Sep - 24 Sep	Ryanair
19 Sep - 29 Sep	Ryanair
10 Sep - 21 Sep	Ryanair	direct
19 Sep - 21 Oct	Ryanair
10 Sep - 23 Sep	Ryanair
10 Sep - 14 Sep	Ryanair	direct
30 Sep - 19 Oct	Vueling Airlines
10 Sep - 17 Sep	Ryanair
10 Sep - 30 Sep	Ryanair
26 Sep - 29 Sep	Ryanair
03 Sep - 10 Sep	Ryanair
19 Sep - 05 Oct	Ryanair
30 Sep - 21 Oct	Vueling Airlines
19 Sep - 20 Oct	Ryanair
24 Sep - 01 Oct	easyJet
24 Sep - 02 Oct	easyJet
26 Sep - 05 Oct	Ryanair
25 Sep - 05 Oct	easyJet
30 Sep - 14 Oct	Vueling Airlines

Also check the deals for one-way flights from Porto to Copenhagen 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 Porto to Copenhagen in September from 129€

Return flights