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

Return flights

30 Sep - 01 Oct	Ryanair
30 Sep - 19 Oct	Vueling Airlines
29 Sep - 02 Oct	Ryanair
30 Sep - 06 Oct	Ryanair
30 Sep - 04 Oct	Ryanair
30 Sep - 21 Oct	Vueling Airlines
29 Sep - 06 Oct	Ryanair
30 Sep - 07 Oct	Ryanair
25 Sep - 01 Oct	Transavia France
30 Sep - 18 Oct	Vueling Airlines
25 Sep - 30 Sep	Transavia France
18 Sep - 23 Sep	Transavia France
23 Sep - 27 Sep	Ryanair
26 Sep - 30 Sep	Transavia France
29 Sep - 30 Sep	Ryanair
24 Sep - 28 Sep	Air Europa
18 Sep - 30 Sep	Transavia France
23 Sep - 28 Sep	Ryanair
22 Sep - 27 Sep	Ryanair
22 Sep - 28 Sep	Ryanair

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 157€

Return flights