Cheapest return flights from Denver to Keflavik in December from 488€

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

Return flights

07 Dec - 27 Dec Icelandair direct
03 Dec - 08 Dec Icelandair direct
29 Dec - 15 Jan Icelandair direct
17 Dec - 10 Jan Icelandair direct
28 Dec - 08 Jan Icelandair direct
07 Dec - 09 Dec Frontier Airlines
07 Dec - 09 Dec Icelandair direct
22 Dec - 29 Dec Icelandair direct
23 Dec - 28 Dec Icelandair direct
21 Dec - 10 Jan Sun Country Airlines
27 Dec - 06 Jan Frontier Airlines
26 Dec - 06 Jan Frontier Airlines
27 Dec - 01 Jan Frontier Airlines
26 Dec - 05 Jan Frontier Airlines
26 Dec - 01 Jan Frontier Airlines
30 Dec - 03 Jan Icelandair

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

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