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

Return flights

11 Sep - 15 Sep	Lufthansa
18 Sep - 21 Sep	LOT
17 Sep - 22 Sep	Lufthansa
10 Sep - 22 Sep	Lufthansa
15 Sep - 24 Sep	Finnair
10 Sep - 21 Sep	Finnair
10 Sep - 23 Sep	Finnair
03 Sep - 14 Sep	Finnair
15 Sep - 22 Sep	Lufthansa
01 Sep - 17 Sep	Finnair
25 Sep - 03 Oct	Lufthansa
19 Sep - 05 Oct	Qatar Airways
24 Sep - 02 Oct	Lufthansa
29 Sep - 06 Oct	Air Canada
26 Sep - 08 Oct	Qatar Airways
30 Sep - 11 Oct	Philippines AirAsia Inc.
22 Sep - 06 Oct	Lufthansa
27 Sep - 08 Oct	Qatar Airways
26 Sep - 11 Oct	Qatar Airways
26 Sep - 05 Oct	Lufthansa

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

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 September from $987

Return flights