Cheapest return flights from Denver to Keflavik in May from $462

Best time to book flights for Denver (DEN) to Keflavik (KEF) flights at AirHint

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

Return flights

12 May - 19 May Frontier Airlines
06 May - 12 May Frontier Airlines
02 May - 04 May Frontier Airlines
01 May - 04 May Frontier Airlines
12 May - 19 May Icelandair direct
14 May - 24 May Icelandair direct
16 May - 25 May Icelandair direct
16 May - 24 May Icelandair direct
16 May - 21 May Icelandair direct
06 May - 12 May Icelandair direct
23 May - 01 Jun Icelandair direct

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

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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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