Cheapest one-way flights from Denver to Keflavik in September from $271

AirHint found the following cheapest one-way flights from Denver (DEN) to Keflavik (KEF) in September 2025 (see full year).

One-Way flights

18 Sep Air Canada
20 Sep Air Canada
19 Sep Frontier Airlines
07 Sep Frontier Airlines
08 Sep Frontier Airlines
06 Sep Frontier Airlines
09 Sep jetBlue
05 Sep jetBlue
04 Sep jetBlue
09 Sep Icelandair direct

Also check the deals for return 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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