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

Return flights

15 Sep - 19 Sep	Ryanair
18 Sep - 22 Sep	Ryanair
28 Sep - 03 Oct	Ryanair
13 Sep - 14 Sep	Ryanair
13 Sep - 16 Sep	Ryanair
14 Sep - 18 Sep	Ryanair
18 Sep - 21 Sep	Ryanair
13 Sep - 17 Sep	Ryanair
25 Sep - 29 Sep	Ryanair
21 Sep - 25 Sep	Ryanair
22 Sep - 25 Sep	Ryanair
27 Sep - 01 Oct	Ryanair
27 Sep - 06 Oct	Ryanair
30 Sep - 04 Oct	easyJet
24 Sep - 01 Oct	easyJet
29 Sep - 06 Oct	easyJet
29 Sep - 05 Oct	Ryanair
30 Sep - 07 Oct	easyJet
25 Sep - 18 Oct	Ryanair
26 Sep - 03 Oct	easyJet

Also check the deals for one-way flights from Frankfurt 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 Frankfurt to Copenhagen in September from 123€

Return flights