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

Return flights

01 Sep - 12 Sep	SWISS
16 Sep - 22 Oct	Icelandair
23 Sep - 30 Sep	Icelandair
22 Sep - 02 Oct	Icelandair
06 Sep - 22 Sep	Air Canada
02 Sep - 16 Sep	Icelandair
12 Sep - 26 Sep	Icelandair
12 Sep - 19 Sep	Icelandair
26 Sep - 03 Oct	Icelandair
03 Sep - 10 Sep	Icelandair
08 Sep - 12 Sep	Icelandair
04 Sep - 16 Sep	Icelandair
08 Sep - 23 Sep	Icelandair
25 Sep - 12 Oct	Icelandair
27 Sep - 04 Oct	Icelandair
16 Sep - 10 Oct	Lufthansa
16 Sep - 22 Oct	Air France	direct
30 Sep - 06 Oct	Icelandair
19 Sep - 06 Oct	Icelandair
09 Sep - 25 Oct	Air France

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 $426

Return flights