Cheapest return flights from Denver to Keflavik in September from 382€

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

Return flights

02 Sep - 31 Oct Icelandair direct
29 Sep - 06 Oct Icelandair direct
22 Sep - 02 Oct Icelandair direct
21 Sep - 02 Oct Icelandair direct
22 Sep - 03 Oct Icelandair direct
05 Sep - 12 Sep Frontier Airlines
24 Sep - 01 Oct Frontier Airlines
25 Sep - 02 Oct Air Canada
24 Sep - 01 Oct Icelandair direct
25 Sep - 02 Oct Icelandair direct
05 Sep - 07 Sep Icelandair direct
18 Sep - 25 Sep Icelandair direct
20 Sep - 02 Oct Frontier Airlines
19 Sep - 26 Sep WestJet
23 Sep - 30 Sep Virgin Atlantic
12 Sep - 19 Sep jetBlue
23 Sep - 30 Sep Icelandair direct
05 Sep - 12 Sep Icelandair direct
19 Sep - 26 Sep Icelandair direct
12 Sep - 19 Sep Icelandair direct

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

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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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