Cheapest return flights from Denver to Keflavik in September from $595

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 September 2025 (see full year).

Return flights

21 Sep - 28 Sep Icelandair direct
09 Sep - 17 Sep jetBlue
17 Sep - 25 Sep Icelandair direct
19 Sep - 27 Sep Icelandair direct
15 Sep - 23 Sep jetBlue
09 Sep - 17 Sep Icelandair direct
15 Sep - 23 Sep Icelandair direct
14 Sep - 22 Sep Icelandair direct

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

Skyscanner

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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