AirHint found the following cheapest return flights from Chicago (ORD) to Paris (ORY) in September 2025 (see full year).

Return flights

18 Sep - 30 Sep	TAP
01 Sep - 15 Sep	TAP
13 Sep - 22 Sep	TAP
04 Sep - 11 Sep	TAP
15 Sep - 25 Sep	TAP
05 Sep - 07 Sep	TAP
05 Sep - 14 Sep	TAP
04 Sep - 13 Sep	TAP
22 Sep - 29 Sep	TAP
26 Sep - 03 Oct	TAP
26 Sep - 05 Oct	TAP
25 Sep - 28 Sep	TAP
24 Sep - 01 Oct	Icelandair
17 Sep - 08 Oct	TAP
16 Sep - 07 Oct	TAP
09 Sep - 25 Oct	TAP

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

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 Paris in September from $410

Return flights