Cheapest return flights from Denver to Keflavik in January from $550

AirHint found the following cheapest return flights from Denver (DEN) to Keflavik (KEF) in January 2026 (see full year).

Return flights

25 Jan - 31 Jan Icelandair direct
15 Jan - 22 Jan Lufthansa
21 Jan - 24 Jan Icelandair direct
24 Jan - 31 Jan Frontier Airlines
23 Jan - 25 Jan Lufthansa
22 Jan - 25 Jan Lufthansa
15 Jan - 18 Jan Lufthansa
21 Jan - 25 Jan Icelandair
13 Jan - 20 Jan jetBlue
18 Jan - 25 Jan Icelandair

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

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