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

28 Sep - 05 Oct Icelandair
29 Sep - 06 Oct Icelandair
30 Sep - 07 Oct Icelandair
01 Sep - 08 Sep Icelandair
22 Sep - 29 Sep Icelandair
24 Sep - 01 Oct jetBlue
25 Sep - 02 Oct jetBlue
21 Sep - 28 Sep Icelandair
10 Sep - 14 Sep jetBlue
23 Sep - 01 Oct Delta
04 Sep - 07 Sep Air Canada
04 Sep - 06 Sep Frontier Airlines

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

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