AirHint found the following cheapest return flights from Chicago (ORD) to Keflavik (KEF) in September 2026 (see full year).
Return flights
| 03 Sep - 07 Sep | Air France | ||
| 04 Sep - 08 Sep | Air France | ||
| 03 Sep - 07 Sep | United | direct | |
| 04 Sep - 08 Sep | Icelandair | direct |
Also check the deals for one-way flights from Chicago to Keflavik in September.
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