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

Return flights

12 Jul - 16 Jul	Icelandair	direct
26 Jul - 02 Aug	Icelandair	direct
20 Jul - 27 Jul	Icelandair	direct
25 Jul - 01 Aug	Icelandair	direct
19 Jul - 26 Jul	Icelandair	direct
08 Jul - 16 Jul	Icelandair	direct
18 Jul - 25 Jul	Allegiant Air
13 Jul - 20 Jul	Icelandair	direct
28 Jul - 01 Aug	Frontier Airlines
22 Jul - 29 Jul	WestJet
18 Jul - 24 Jul	Frontier Airlines
23 Jul - 30 Jul	Air Canada
14 Jul - 21 Jul	Icelandair	direct
28 Jul - 01 Aug	Icelandair	direct

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

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 July from 470€

Return flights