Cheapest return MDW–KEF flights, September

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

Return flights

08 Sep - 18 Sep KLM
16 Sep - 23 Sep Air France
13 Sep - 20 Sep Air France
21 Sep - 28 Sep Southwest Airlines
27 Sep - 05 Oct KLM
25 Sep - 02 Oct Southwest Airlines
16 Sep - 28 Sep KLM
29 Sep - 06 Oct Southwest Airlines
17 Sep - 24 Sep Southwest Airlines
18 Sep - 24 Sep Southwest Airlines
30 Sep - 07 Oct KLM
02 Sep - 10 Sep Southwest Airlines
05 Sep - 15 Sep Air France
01 Sep - 08 Sep Delta

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

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