AirHint found the following cheapest return flights from Denver (DEN) to Keflavik (KEF) in March 2026 (see full year).

Return flights

26 Mar - 02 Apr	Icelandair	direct
27 Mar - 03 Apr	Icelandair	direct
10 Mar - 16 Mar	Icelandair	direct
27 Mar - 10 Apr	Icelandair	direct
17 Mar - 30 Mar	Icelandair	direct
24 Mar - 31 Mar	jetBlue
25 Mar - 01 Apr	jetBlue
19 Mar - 20 Mar	Icelandair	direct
19 Mar - 28 Mar	Icelandair
18 Mar - 28 Mar	Frontier Airlines

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

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 March from 362€

Return flights