Cheapest return ORD–KEF flights, May

AirHint found the following cheapest return flights from Chicago (ORD) to Keflavik (KEF) in May 2026 (see full year).

Return flights

27 May - 03 Jun Icelandair direct
30 May - 03 Jun Icelandair direct
26 May - 30 May Icelandair direct
31 May - 14 Jun Alaska Airlines
13 May - 17 May jetBlue
11 May - 18 May Icelandair
21 May - 25 May United direct
21 May - 24 May United direct
21 May - 31 May United direct
23 May - 30 May Frontier Airlines
22 May - 24 May United
12 May - 19 May Aer Lingus
13 May - 16 May SWISS
31 May - 14 Jun Brussels Airlines direct

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

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