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

Return flights

01 Sep - 08 Sep	Air Canada
30 Sep - 07 Oct	Icelandair
03 Sep - 10 Sep	KLM
09 Sep - 16 Sep	Air France	direct
03 Sep - 09 Sep	KLM
05 Sep - 26 Sep	Icelandair
17 Sep - 22 Sep	Icelandair
17 Sep - 21 Sep	Icelandair
17 Sep - 24 Sep	Icelandair
18 Sep - 25 Sep	Icelandair
15 Sep - 22 Sep	Icelandair
30 Sep - 07 Oct	Air France	direct
27 Sep - 04 Oct	Icelandair
25 Sep - 04 Oct	Icelandair
24 Sep - 01 Oct	Air France
06 Sep - 04 Oct	Delta

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 361€

Return flights