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

Return flights

22 Sep - 30 Sep	Scandinavian Airlines
23 Sep - 30 Sep	Finnair
26 Sep - 28 Sep	Scandinavian Airlines
25 Sep - 02 Oct	KLM
26 Sep - 03 Oct	Scandinavian Airlines
29 Sep - 07 Oct	Scandinavian Airlines
28 Sep - 06 Oct	LOT
28 Sep - 02 Oct	Air Canada
26 Sep - 05 Oct	Scandinavian Airlines
25 Sep - 28 Sep	Lufthansa
22 Sep - 03 Oct	Lufthansa
26 Sep - 07 Oct	Scandinavian Airlines
22 Sep - 06 Oct	Lufthansa
23 Sep - 13 Oct	KLM
20 Sep - 27 Sep	Finnair
22 Sep - 27 Sep	Lufthansa
20 Sep - 30 Sep	LOT

Also check the deals for one-way flights from Seoul 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 Seoul to Keflavik in September from $890

Return flights