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

Return flights

18 Sep - 22 Sep	Icelandair
16 Sep - 23 Sep	Icelandair
27 Sep - 08 Oct	Icelandair
19 Sep - 21 Sep	Icelandair
17 Sep - 26 Sep	Icelandair
15 Sep - 25 Sep	Icelandair
02 Sep - 09 Sep	Iberia
07 Sep - 17 Sep	Air France	direct
03 Sep - 10 Sep	Delta	direct
02 Sep - 09 Sep	Delta	direct
18 Sep - 30 Sep	Icelandair
09 Sep - 25 Oct	Icelandair
15 Sep - 18 Oct	Scandinavian Airlines
09 Sep - 25 Oct	Air France	direct
26 Sep - 03 Oct	United	direct

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 $432

Return flights