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

Return flights

04 Nov - 12 Nov	Icelandair	direct
17 Nov - 21 Nov	Frontier Airlines
17 Nov - 21 Nov	Icelandair	direct
14 Nov - 06 Dec	Icelandair	direct
29 Nov - 06 Dec	Icelandair	direct
02 Nov - 23 Nov	Icelandair	direct
14 Nov - 16 Nov	Icelandair	direct
01 Nov - 22 Nov	Icelandair
01 Nov - 08 Nov	Icelandair
06 Nov - 11 Nov	Frontier Airlines
09 Nov - 29 Nov	Frontier Airlines
22 Nov - 29 Nov	Frontier Airlines

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

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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Cheapest return flights from Denver to Keflavik in November from 386€

Return flights