AirHint found the following cheapest return flights from Chicago (ORD) to Keflavik (KEF) in December 2025 (see full year).

Return flights

17 Dec - 24 Dec	Icelandair	direct
11 Dec - 15 Dec	Icelandair	direct
08 Dec - 14 Dec	Icelandair	direct
06 Dec - 12 Dec	Icelandair	direct
04 Dec - 09 Dec	Icelandair	direct
31 Dec - 24 Jan	Icelandair	direct
02 Dec - 27 Dec	Icelandair	direct
15 Dec - 01 Jan	Icelandair	direct
24 Dec - 28 Dec	Icelandair	direct
09 Dec - 12 Dec	Icelandair	direct
28 Dec - 31 Dec	Icelandair	direct
26 Dec - 17 Jan	Icelandair	direct
11 Dec - 03 Jan	Frontier Airlines
28 Dec - 02 Jan	Sun Country Airlines
28 Dec - 02 Jan	Icelandair	direct

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

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 December from 446€

Return flights