Cheapest return flights from Denver to Keflavik in May from $548

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

10 May - 17 May Frontier Airlines
24 May - 02 Jun Alaska Airlines
02 May - 09 May Frontier Airlines
10 May - 17 May Icelandair direct
02 May - 09 May Icelandair direct
09 May - 11 May Icelandair direct
18 May - 26 May Icelandair direct
04 May - 09 May Frontier Airlines
28 May - 11 Jun Icelandair direct
31 May - 07 Jun Icelandair direct
23 May - 01 Jun Icelandair direct
24 May - 02 Jun Icelandair direct
17 May - 26 May jetBlue

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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