AirHint found the following cheapest return flights from Seoul (ICN) to Keflavik (KEF) in May 2026 (see full year).

Return flights

04 May - 12 May	Lufthansa
27 May - 03 Jun	Scandinavian Airlines
22 May - 05 Jun	Scandinavian Airlines
15 May - 23 May	Finnair
01 May - 09 May	Finnair
01 May - 23 May	Finnair
22 May - 30 May	Finnair
04 May - 09 May	Finnair
23 May - 06 Jun	Finnair
22 May - 31 May	Lufthansa
27 May - 29 May	Lufthansa
23 May - 30 May	Lufthansa

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

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 May from 786€

Return flights