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

Return flights

22 Sep - 02 Oct	TAP
07 Sep - 14 Sep	TAP
08 Sep - 15 Sep	TAP
04 Sep - 11 Sep	Spirit Airlines
09 Sep - 18 Sep	Spirit Airlines
30 Sep - 06 Oct	Spirit Airlines
08 Sep - 22 Sep	Iberia
07 Sep - 20 Sep	Iberia
08 Sep - 21 Sep	Spirit Airlines
12 Sep - 19 Sep	Spirit Airlines
03 Sep - 10 Sep	Spirit Airlines
19 Sep - 06 Oct	Spirit Airlines
23 Sep - 30 Sep	Spirit Airlines
22 Sep - 05 Oct	TAP
16 Sep - 22 Oct	Iberia
25 Sep - 12 Oct	Iberia
16 Sep - 10 Oct	Iberia

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 331€

Return flights