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

Return flights

28 Sep - 02 Oct	Wizz Air
25 Sep - 02 Oct	Wizz Air
25 Sep - 30 Sep	Wizz Air
25 Sep - 07 Oct	Wizz Air
25 Sep - 28 Sep	Wizz Air
23 Sep - 01 Oct	Wizz Air
23 Sep - 02 Oct	Wizz Air
25 Sep - 01 Oct	Fly Play
23 Sep - 29 Sep	Wizz Air
23 Sep - 30 Sep	Wizz Air
24 Sep - 30 Sep	Wizz Air
25 Sep - 29 Sep	Fly Play
24 Sep - 01 Oct	Wizz Air
24 Sep - 02 Oct	Fly Play
25 Sep - 02 Oct	Fly Play	direct
27 Sep - 02 Oct	Wizz Air
24 Sep - 29 Sep	Wizz Air
27 Sep - 30 Sep	easyJet
22 Sep - 29 Sep	Fly Play
20 Sep - 29 Sep	Fly Play

Also check the deals for one-way flights from Keflavik 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 Keflavik to Copenhagen in September from 147€

Return flights