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

Return flights

23 Oct - 26 Oct	Lufthansa
17 Oct - 25 Oct	Lufthansa
08 Oct - 16 Oct	Lufthansa
13 Oct - 23 Oct	Lufthansa
16 Oct - 23 Oct	Lufthansa
13 Oct - 20 Oct	Lufthansa
12 Oct - 20 Oct	LOT
24 Oct - 02 Nov	Lufthansa
17 Oct - 28 Oct	Scandinavian Airlines
12 Oct - 19 Oct	LOT
13 Oct - 21 Oct	Finnair
27 Oct - 03 Nov	Finnair
30 Oct - 03 Nov	Finnair
31 Oct - 08 Nov	Finnair
24 Oct - 01 Nov	Finnair
29 Oct - 07 Nov	Qatar Airways

Also check the deals for one-way flights from Seoul to Keflavik in October.

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 October from 607€

Return flights