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

Return flights

02 Sep - 23 Sep	United
03 Sep - 24 Sep	KLM
09 Sep - 30 Sep	Air France
03 Sep - 10 Sep	KLM
03 Sep - 12 Sep	KLM
09 Sep - 19 Sep	Air France
02 Sep - 10 Sep	KLM
10 Sep - 25 Sep	Air Canada
10 Sep - 01 Oct	Air France
10 Sep - 22 Sep	United
09 Sep - 22 Sep	United
10 Sep - 06 Oct	Air France
16 Sep - 07 Oct	Air France
23 Sep - 14 Oct	KLM
24 Sep - 15 Oct	Air France
22 Sep - 17 Oct	KLM
30 Sep - 07 Oct	KLM
29 Sep - 07 Oct	KLM
16 Sep - 04 Oct	Spirit Airlines
16 Sep - 12 Oct	Air France

Also check the deals for one-way flights from Columbus 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 Columbus to Keflavik in September from 576€

Return flights