AirHint found the following cheapest return flights from Oslo (OSL) to Keflavik (KEF) in October 2025 (see full year).

Return flights

12 Oct - 21 Oct	Norwegian	direct
16 Oct - 21 Oct	Norwegian	direct
07 Oct - 21 Oct	Norwegian	direct
09 Oct - 21 Oct	Norwegian	direct
12 Oct - 23 Oct	Norwegian	direct
12 Oct - 14 Oct	Norwegian	direct
16 Oct - 23 Oct	Norwegian	direct
21 Oct - 23 Oct	Norwegian	direct
14 Oct - 21 Oct	Norwegian	direct
07 Oct - 23 Oct	Norwegian	direct
30 Oct - 02 Nov	Scandinavian Airlines	direct
29 Oct - 01 Nov	Icelandair	direct
31 Oct - 03 Nov	Icelandair	direct

Also check the deals for one-way flights from Oslo to Keflavik in October.

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 Oslo to Keflavik in October from $132

Return flights