Cheapest return flights from Chicago to Keflavik in September from $392

AirHint found the following cheapest return flights from Chicago (ORD) to Keflavik (KEF) in September 2025 (see full year).

Return flights

10 Sep - 18 Sep Icelandair direct
02 Sep - 11 Sep Icelandair direct
07 Sep - 18 Sep Icelandair direct
20 Sep - 23 Sep Spirit Airlines
13 Sep - 20 Sep Spirit Airlines
10 Sep - 19 Sep Spirit Airlines
10 Sep - 17 Sep jetBlue
18 Sep - 26 Sep Spirit Airlines
06 Sep - 13 Sep Spirit Airlines
08 Sep - 24 Sep Frontier Airlines
29 Sep - 06 Oct Spirit Airlines
26 Sep - 03 Oct Spirit Airlines
27 Sep - 05 Oct Spirit Airlines
27 Sep - 04 Oct Spirit Airlines
26 Sep - 03 Oct Icelandair direct
18 Sep - 14 Oct Frontier Airlines
28 Sep - 03 Oct Icelandair direct
29 Sep - 05 Oct Spirit Airlines
29 Sep - 06 Oct Icelandair direct
29 Sep - 05 Oct Icelandair direct

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

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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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