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

Return flights

13 Jul - 21 Jul	Icelandair	direct
26 Jul - 02 Aug	Spirit Airlines
09 Jul - 16 Jul	Icelandair	direct
16 Jul - 24 Jul	Icelandair	direct
16 Jul - 22 Jul	Icelandair	direct
28 Jul - 04 Aug	Icelandair	direct
29 Jul - 08 Aug	Icelandair	direct
26 Jul - 03 Aug	Spirit Airlines
08 Jul - 13 Jul	Air Canada
16 Jul - 30 Jul	United
15 Jul - 24 Jul	United	direct
18 Jul - 20 Jul	Air Canada
08 Jul - 16 Jul	Air Canada
17 Jul - 20 Jul	Air Canada
28 Jul - 01 Aug	Icelandair	direct
31 Jul - 02 Aug	Icelandair	direct

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

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 July from 481€

Return flights