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

Return flights

27 Sep - 30 Sep	Ryanair
30 Sep - 01 Oct	Ryanair
27 Sep - 01 Oct	Ryanair
23 Sep - 27 Oct	Ryanair
23 Sep - 24 Sep	Ryanair
16 Sep - 22 Sep	Ryanair
24 Sep - 30 Sep	Ryanair
25 Sep - 30 Sep	Ryanair
29 Sep - 09 Oct	Ryanair
26 Sep - 01 Oct	Ryanair
17 Sep - 23 Sep	Pegasus Airlines
17 Sep - 22 Sep	Pegasus Airlines
29 Sep - 01 Oct	Ryanair
17 Sep - 24 Sep	Pegasus Airlines
29 Sep - 06 Oct	Ryanair
29 Sep - 02 Oct	Ryanair
23 Sep - 26 Sep	Ryanair
18 Sep - 22 Sep	AJet
30 Sep - 06 Oct	Ryanair
27 Sep - 04 Oct	Ryanair

Also check the deals for one-way flights from Cologne 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 Cologne to Copenhagen in September from 151€

Return flights