Cheapest return flights from Chicago to Keflavik in May from 442€

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 May 2025 (see full year).

Return flights

13 May - 19 May Spirit Airlines
10 May - 16 May Frontier Airlines
07 May - 16 May Spirit Airlines
03 May - 14 May Frontier Airlines
06 May - 14 May Frontier Airlines
06 May - 13 May Frontier Airlines
12 May - 19 May Spirit Airlines
13 May - 20 May Spirit Airlines
14 May - 20 May Spirit Airlines
03 May - 09 May Frontier Airlines
29 May - 05 Jun Icelandair direct
31 May - 05 Jun Icelandair direct
15 May - 05 Jun Icelandair direct

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

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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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