Cheapest return flights from Chicago to Keflavik in September from 298€

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

Return flights

26 Sep - 03 Oct Icelandair direct
22 Sep - 01 Oct Icelandair direct
17 Sep - 24 Sep Icelandair direct
05 Sep - 08 Sep Icelandair direct
07 Sep - 18 Sep Icelandair direct
03 Sep - 08 Sep Icelandair direct
02 Sep - 10 Sep Icelandair direct
06 Sep - 11 Sep Icelandair direct
10 Sep - 17 Sep Icelandair direct
19 Sep - 24 Sep Icelandair direct
14 Sep - 19 Sep Spirit Airlines
09 Sep - 01 Oct Spirit Airlines
06 Sep - 12 Sep Spirit Airlines
30 Sep - 05 Oct Spirit Airlines
10 Sep - 01 Oct Spirit Airlines
24 Sep - 01 Oct Spirit Airlines
29 Sep - 05 Oct Frontier Airlines
10 Sep - 01 Oct Icelandair direct
30 Sep - 05 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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