Cheapest return DTW–KEF flights, September

AirHint found the following cheapest return flights from Detroit (DTW) to Keflavik (KEF) in September 2026 (see full year).

Return flights

30 Sep - 07 Oct Icelandair
22 Sep - 29 Sep Icelandair
18 Sep - 25 Sep Icelandair
09 Sep - 16 Sep Icelandair
11 Sep - 18 Sep Icelandair
17 Sep - 24 Sep jetBlue
19 Sep - 26 Sep Icelandair
23 Sep - 01 Oct Delta
12 Sep - 19 Sep Icelandair
06 Sep - 13 Sep Frontier Airlines

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

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