Cheapest return flights from Denver to Keflavik in July from $625

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

Return flights

15 Jul - 23 Jul Icelandair direct
26 Jul - 02 Aug Icelandair direct
31 Jul - 08 Aug Icelandair direct
08 Jul - 16 Jul Icelandair direct
20 Jul - 27 Jul Icelandair direct
25 Jul - 01 Aug Icelandair direct
31 Jul - 09 Aug Icelandair direct
19 Jul - 26 Jul Icelandair direct
04 Jul - 11 Jul Icelandair direct
31 Jul - 02 Aug Icelandair direct
18 Jul - 20 Jul Allegiant Air
17 Jul - 21 Jul Icelandair direct
13 Jul - 20 Jul Icelandair direct
18 Jul - 25 Jul Frontier Airlines
18 Jul - 24 Jul Frontier Airlines

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

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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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