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

Return flights

30 Mar - 10 Apr	Icelandair	direct
30 Mar - 12 Apr	Icelandair	direct
09 Mar - 16 Mar	Icelandair	direct
28 Mar - 01 Apr	Icelandair	direct
10 Mar - 16 Mar	Icelandair	direct
13 Mar - 18 Mar	Icelandair	direct
30 Mar - 11 Apr	Lufthansa
12 Mar - 18 Mar	Alaska Airlines
12 Mar - 22 Mar	Scandinavian Airlines
13 Mar - 19 Mar	Icelandair	direct
14 Mar - 19 Mar	jetBlue
23 Mar - 27 Mar	Alaska Airlines
12 Mar - 19 Mar	Alaska Airlines
13 Mar - 22 Mar	Alaska 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 $536

Return flights