Cheapest return flights from Denver to Keflavik in September from 319€

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

Return flights

25 Sep - 02 Oct Icelandair direct
29 Sep - 06 Oct Icelandair direct
23 Sep - 30 Sep Icelandair direct
05 Sep - 12 Sep Icelandair direct
07 Sep - 12 Sep Icelandair direct
24 Sep - 01 Oct Icelandair direct
28 Sep - 05 Oct Air Canada

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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