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

Return flights

29 Aug - 04 Sep	China Southern
18 Aug - 25 Aug	China Eastern
06 Aug - 10 Aug	SWISS
28 Aug - 31 Aug	LOT
21 Aug - 25 Aug	LOT
23 Aug - 31 Aug	LOT
08 Aug - 10 Aug	Lufthansa
16 Aug - 24 Aug	LOT
19 Aug - 26 Aug	Finnair
15 Aug - 29 Aug	China Eastern
16 Aug - 23 Aug	SWISS
29 Aug - 06 Sep	Emirates
22 Aug - 20 Sep	Finnair
23 Aug - 08 Sep	Air Canada
31 Aug - 09 Sep	Air Canada

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 $1008

Return flights