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

Return flights

30 Aug - 29 Sep	LOT
25 Aug - 01 Sep	China Southern
16 Aug - 27 Aug	LOT
26 Aug - 31 Aug	LOT
21 Aug - 25 Aug	LOT
20 Aug - 28 Aug	Finnair
27 Aug - 10 Sep	Finnair
21 Aug - 26 Aug	Qatar Airways
06 Aug - 09 Aug	SWISS
13 Aug - 20 Aug	KLM
17 Aug - 28 Aug	Finnair
14 Aug - 27 Aug	Finnair
14 Aug - 19 Aug	Qatar Airways
29 Aug - 05 Sep	Qatar Airways
27 Aug - 01 Sep	Finnair
29 Aug - 06 Sep	Finnair
31 Aug - 28 Sep	Qatar Airways
30 Aug - 27 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 808€

Return flights