Cheapest one-way flights from Denver to Keflavik in September from 261€

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

One-Way flights

27 Sep Frontier Airlines
26 Sep Frontier Airlines
20 Sep Frontier Airlines
19 Sep Frontier Airlines
18 Sep Frontier Airlines
16 Sep Frontier Airlines
17 Sep Frontier Airlines
26 Sep Icelandair direct
27 Sep Icelandair direct
16 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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