Cheapest return flights from Chicago to Keflavik in September from 525€

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 September 2025 (see full year).

Return flights

08 Sep - 19 Sep United
03 Sep - 11 Sep jetBlue
24 Sep - 01 Oct jetBlue
28 Sep - 06 Oct Air France
23 Sep - 02 Oct Air France
20 Sep - 01 Oct KLM
25 Sep - 06 Oct Air France
27 Sep - 08 Oct Air France
21 Sep - 02 Oct Air France
29 Sep - 07 Oct KLM
15 Sep - 23 Sep United direct
06 Sep - 14 Sep United direct
06 Sep - 17 Sep United
09 Sep - 20 Sep United
07 Sep - 18 Sep United direct
10 Sep - 20 Sep United
04 Sep - 15 Sep United direct
05 Sep - 12 Sep jetBlue
25 Sep - 04 Oct British Airways
30 Sep - 06 Oct Virgin Atlantic

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

Skyscanner

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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