Cheapest return flights from Denver to Keflavik in January from $425

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

Return flights

19 Jan - 24 Jan Icelandair direct
11 Jan - 18 Jan Icelandair direct
09 Jan - 17 Jan Icelandair direct
16 Jan - 20 Jan Icelandair direct
08 Jan - 15 Jan SWISS
07 Jan - 14 Jan Frontier Airlines
04 Jan - 17 Jan Hawaiian Airlines
15 Jan - 19 Jan Frontier Airlines
09 Jan - 10 Jan Icelandair direct
04 Jan - 11 Jan Southwest Airlines

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

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