Cheapest return flights from Chicago to Keflavik in September from $523

Best time to book flights for Chicago (ORD) to Keflavik (KEF) flights at AirHint

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

Return flights

23 Sep - 04 Oct Air Canada
25 Sep - 06 Oct Air Canada
23 Sep - 30 Sep Air Canada
23 Sep - 01 Oct jetBlue
15 Sep - 23 Sep United
16 Sep - 24 Sep jetBlue
02 Sep - 14 Sep SWISS
01 Sep - 14 Sep Lufthansa
24 Sep - 30 Sep jetBlue
02 Sep - 10 Sep jetBlue
09 Sep - 17 Sep United
14 Sep - 22 Sep United
05 Sep - 13 Sep KLM
22 Sep - 01 Oct Icelandair direct
29 Sep - 10 Oct Icelandair direct
25 Sep - 03 Oct British Airways
26 Sep - 01 Oct Icelandair direct
23 Sep - 01 Oct Icelandair direct
26 Sep - 07 Oct Icelandair direct
25 Sep - 03 Oct Icelandair direct

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

Skyscanner

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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