Cheapest one-way flights from Chicago to Keflavik in October from $307

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

One-Way flights

22 Oct Frontier Airlines
30 Oct WestJet
20 Oct Spirit Airlines
20 Oct Icelandair direct
21 Oct Icelandair direct
19 Oct Frontier Airlines
22 Oct Icelandair direct
18 Oct Spirit Airlines
16 Oct Spirit Airlines
17 Oct Frontier Airlines

Also check the deals for return flights from Chicago to Keflavik in October.

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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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