AirHint found the following cheapest return flights from Detroit (DTW) to Keflavik (KEF) in December 2025 (see full year).

Return flights

04 Dec - 11 Dec	Icelandair	direct
01 Dec - 06 Dec	Icelandair	direct
06 Dec - 13 Dec	Icelandair	direct
06 Dec - 11 Dec	Icelandair	direct
01 Dec - 08 Dec	Icelandair	direct
13 Dec - 20 Dec	Icelandair	direct
01 Dec - 07 Dec	Lufthansa
22 Dec - 27 Dec	Icelandair	direct
07 Dec - 13 Dec	Spirit Airlines
06 Dec - 12 Dec	Lufthansa
16 Dec - 10 Jan	Spirit Airlines
27 Dec - 17 Jan	Icelandair
31 Dec - 07 Jan	jetBlue
28 Dec - 11 Jan	Sun Country Airlines
26 Dec - 02 Jan	Spirit Airlines

Also check the deals for one-way flights from Detroit to Keflavik in December.

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 Detroit to Keflavik in December from 319€

Return flights