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

Return flights

08 Dec - 15 Dec	Icelandair	direct
04 Dec - 11 Dec	Icelandair	direct
20 Dec - 25 Dec	Icelandair	direct
08 Dec - 14 Dec	Lufthansa
07 Dec - 13 Dec	jetBlue
02 Dec - 25 Dec	jetBlue
29 Dec - 03 Jan	Icelandair	direct
14 Dec - 21 Dec	jetBlue
18 Dec - 23 Dec	Icelandair
03 Dec - 23 Dec	Southwest Airlines
21 Dec - 27 Dec	jetBlue

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 279€

Return flights