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

Return flights

23 Aug - 26 Aug	Lufthansa
28 Aug - 31 Aug	Lufthansa
26 Aug - 31 Aug	Lufthansa
23 Aug - 31 Aug	Lufthansa
29 Aug - 05 Sep	Lufthansa
28 Aug - 04 Sep	Lufthansa
27 Aug - 03 Sep	Finnair
28 Aug - 05 Sep	Lufthansa
17 Aug - 25 Aug	Lufthansa
20 Aug - 27 Aug	Finnair
21 Aug - 30 Aug	Lufthansa
20 Aug - 20 Sep	Finnair
16 Aug - 27 Aug	Lufthansa
17 Aug - 27 Aug	Lufthansa
16 Aug - 17 Aug	SWISS
25 Aug - 05 Sep	Lufthansa
29 Aug - 06 Sep	Lufthansa
19 Aug - 02 Sep	Emirates

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

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 August from 805€

Return flights