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

Return flights

02 May - 09 May	Spirit Airlines
09 May - 16 May	Spirit Airlines
04 May - 11 May	Icelandair	direct
06 May - 13 May	Icelandair	direct
05 May - 12 May	Icelandair	direct
10 May - 17 May	Icelandair	direct
19 May - 26 May	Icelandair	direct
03 May - 10 May	Icelandair	direct
24 May - 31 May	Icelandair	direct
01 May - 08 May	Icelandair	direct
27 May - 07 Jun	Icelandair	direct
31 May - 05 Jun	Icelandair	direct

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

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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Cheapest return flights from Chicago to Keflavik in May from 423€

Return flights