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

Return flights

15 Jul - 19 Aug	Lufthansa
16 Jul - 24 Jul	Lufthansa
14 Jul - 22 Jul	Lufthansa
16 Jul - 20 Jul	Lufthansa
16 Jul - 21 Jul	Lufthansa
15 Jul - 22 Jul	Lufthansa
01 Jul - 08 Jul	Lufthansa
15 Jul - 20 Jul	Lufthansa
07 Jul - 20 Jul	SWISS
17 Jul - 24 Jul	Lufthansa
19 Jul - 22 Jul	Lufthansa
31 Jul - 14 Aug	KLM
14 Jul - 04 Aug	Lufthansa
23 Jul - 04 Aug	KLM
25 Jul - 07 Aug	KLM
28 Jul - 11 Aug	Lufthansa
28 Jul - 03 Aug	Lufthansa
28 Jul - 01 Aug	Lufthansa
29 Jul - 07 Aug	Lufthansa
27 Jul - 10 Aug	LOT

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

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 July from $849

Return flights