Cheapest one-way flights from Chicago to Keflavik in September from 153€

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

One-Way flights

18 Sep Spirit Airlines
14 Sep Spirit Airlines
26 Sep Spirit Airlines
05 Sep Frontier Airlines
15 Sep Spirit Airlines
17 Sep Spirit Airlines
09 Sep Spirit Airlines
05 Sep Icelandair direct
15 Sep Icelandair direct
17 Sep Icelandair direct

Also check the deals for return 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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