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

Return flights

20 Sep - 23 Sep	Wizz Air
13 Sep - 24 Sep	easyJet
18 Sep - 22 Sep	Fly Play	direct
20 Sep - 22 Sep	Fly Play	direct
09 Sep - 13 Sep	Fly Play	direct
04 Sep - 10 Sep	Wizz Air
17 Sep - 21 Sep	Fly Play	direct
06 Sep - 09 Sep	Fly Play	direct
10 Sep - 13 Sep	Fly Play	direct
18 Sep - 21 Sep	Fly Play	direct
27 Sep - 03 Oct	easyJet
25 Sep - 01 Oct	Fly Play	direct
30 Sep - 07 Oct	Wizz Air
27 Sep - 05 Oct	easyJet
27 Sep - 07 Oct	Wizz Air
30 Sep - 06 Oct	Wizz Air
27 Sep - 02 Oct	Wizz Air
27 Sep - 04 Oct	Wizz Air
29 Sep - 08 Oct	easyJet
28 Sep - 10 Oct	easyJet

Also check the deals for one-way flights from Copenhagen to Keflavik 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 Copenhagen to Keflavik in September from $200

Return flights