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

Return flights

24 Sep - 05 Oct	Vueling Airlines
30 Sep - 05 Oct	Vueling Airlines
17 Sep - 05 Oct	Vueling Airlines
30 Sep - 19 Oct	Vueling Airlines
16 Sep - 05 Oct	Vueling Airlines
18 Sep - 05 Oct	Vueling Airlines
24 Sep - 28 Sep	Vueling Airlines
23 Sep - 05 Oct	Vueling Airlines
19 Sep - 22 Sep	easyJet
22 Sep - 05 Oct	Vueling Airlines
18 Sep - 22 Sep	easyJet
30 Sep - 30 Oct	easyJet
18 Sep - 05 Oct	Norwegian Air Sweden AOC	direct
04 Sep - 09 Sep	easyJet
24 Sep - 30 Sep	Vueling Airlines
13 Sep - 20 Sep	Ryanair
03 Sep - 06 Sep	easyJet
16 Sep - 17 Sep	easyJet
23 Sep - 28 Sep	Ryanair
26 Sep - 30 Sep	easyJet

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 118€

Return flights