Cheapest return flights from Denver to Keflavik in October from $379

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

Return flights

14 Oct - 30 Oct Icelandair direct
30 Oct - 07 Nov Icelandair direct
28 Oct - 04 Nov Icelandair direct
29 Oct - 05 Nov Icelandair direct
30 Oct - 06 Nov Icelandair direct
31 Oct - 07 Nov Icelandair direct
27 Oct - 04 Nov Icelandair direct
28 Oct - 05 Nov Icelandair direct
29 Oct - 06 Nov Icelandair direct
22 Oct - 29 Oct Icelandair direct
21 Oct - 29 Oct Icelandair direct
22 Oct - 30 Oct Icelandair direct
23 Oct - 29 Oct Icelandair direct
21 Oct - 31 Oct Icelandair direct
23 Oct - 31 Oct Icelandair direct
04 Oct - 11 Oct Frontier Airlines
17 Oct - 24 Oct Frontier Airlines
03 Oct - 11 Oct Frontier Airlines
30 Oct - 02 Nov Icelandair direct
31 Oct - 08 Nov Icelandair direct

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

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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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