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

Return flights

26 Sep - 03 Oct	Icelandair
30 Sep - 07 Oct	SWISS
27 Sep - 03 Oct	Icelandair
29 Sep - 07 Oct	SWISS
24 Sep - 11 Oct	Air Canada
28 Sep - 18 Oct	Air Canada
28 Sep - 05 Oct	Air Canada
27 Sep - 18 Oct	Air Canada
22 Sep - 03 Oct	United
22 Sep - 29 Sep	SWISS
29 Sep - 25 Oct	Spirit Airlines
25 Sep - 30 Sep	SWISS
20 Sep - 25 Sep	Aer Lingus
25 Sep - 30 Sep	United	direct
20 Sep - 24 Sep	Aer Lingus
17 Sep - 24 Sep	Icelandair
25 Sep - 29 Sep	Air Canada
26 Sep - 29 Sep	SWISS
23 Sep - 30 Sep	Air France
15 Sep - 25 Sep	ITA Airways

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 $525

Return flights