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

Return flights

13 Aug - 20 Aug	Lufthansa
11 Aug - 17 Aug	SWISS
12 Aug - 19 Aug	Lufthansa
06 Aug - 17 Aug	SWISS
28 Aug - 31 Aug	LOT
27 Aug - 10 Sep	Lufthansa
16 Aug - 27 Aug	Lufthansa
14 Aug - 24 Aug	LOT
05 Aug - 18 Aug	Lufthansa
31 Aug - 07 Sep	LOT
23 Aug - 29 Aug	SWISS
23 Aug - 31 Aug	SWISS
01 Aug - 01 Sep	Lufthansa
18 Aug - 19 Sep	Finnair
31 Aug - 12 Sep	Lufthansa

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 $841

Return flights