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

Return flights

14 Sep - 23 Sep	Lufthansa
15 Sep - 25 Sep	Lufthansa
10 Sep - 23 Sep	Lufthansa
03 Sep - 23 Sep	Lufthansa
04 Sep - 18 Sep	Lufthansa
22 Sep - 25 Sep	Lufthansa
02 Sep - 11 Sep	Lufthansa
05 Sep - 10 Sep	Lufthansa
12 Sep - 23 Sep	Lufthansa
18 Sep - 25 Sep	Lufthansa
27 Sep - 03 Oct	Scandinavian Airlines
27 Sep - 05 Oct	Scandinavian Airlines
27 Sep - 12 Oct	Scandinavian Airlines
23 Sep - 02 Oct	Finnair
25 Sep - 04 Oct	Lufthansa
28 Sep - 05 Oct	LOT
26 Sep - 09 Oct	Scandinavian Airlines
27 Sep - 09 Oct	Scandinavian Airlines
29 Sep - 03 Oct	Scandinavian Airlines
30 Sep - 06 Oct	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 587€

Return flights