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

Return flights

10 Apr - 17 Apr	Icelandair	direct
13 Apr - 20 Apr	Icelandair	direct
16 Apr - 23 Apr	Icelandair	direct
17 Apr - 24 Apr	Icelandair	direct
20 Apr - 27 Apr	Icelandair	direct
23 Apr - 30 Apr	Icelandair	direct
09 Apr - 16 Apr	Icelandair	direct
22 Apr - 29 Apr	Virgin Atlantic
15 Apr - 22 Apr	Finnair
14 Apr - 21 Apr	Finnair

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

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 April from 476€

Return flights