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

Return flights

28 Aug - 04 Sep	Air China
29 Aug - 05 Sep	Air China
30 Aug - 08 Sep	LOT
30 Aug - 07 Sep	LOT
26 Aug - 10 Sep	LOT
27 Aug - 03 Sep	Etihad Airways
29 Aug - 16 Sep	Air China
27 Aug - 07 Sep	Finnair
25 Aug - 04 Sep	Finnair
26 Aug - 11 Sep	Lufthansa
07 Aug - 13 Aug	LOT
07 Aug - 18 Aug	LOT
07 Aug - 20 Aug	LOT
05 Aug - 11 Aug	China Eastern
05 Aug - 13 Aug	KLM
21 Aug - 29 Aug	Air China
06 Aug - 21 Aug	SWISS
24 Aug - 26 Aug	Qatar Airways
28 Aug - 31 Aug	LOT
25 Aug - 29 Aug	Finnair

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 807€

Return flights