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

Return flights

14 Oct - 21 Oct	Icelandair	direct
06 Oct - 13 Oct	Icelandair	direct
16 Oct - 19 Oct	Spirit Airlines
18 Oct - 25 Oct	Icelandair	direct
23 Oct - 27 Oct	Icelandair	direct
23 Oct - 26 Oct	Spirit Airlines
02 Oct - 06 Oct	Spirit Airlines
22 Oct - 26 Oct	Spirit Airlines
07 Oct - 14 Oct	Icelandair	direct
09 Oct - 13 Oct	Icelandair	direct
29 Oct - 05 Nov	Icelandair

Also check the deals for one-way flights from Detroit 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 Detroit to Keflavik in October from $378

Return flights