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

Return flights

29 Sep - 15 Oct	TAP
25 Sep - 30 Sep	TAP
06 Sep - 11 Sep	Spirit Airlines
15 Sep - 11 Oct	TAP
30 Sep - 15 Oct	Spirit Airlines
11 Sep - 19 Sep	TAP
21 Sep - 30 Sep	TAP
05 Sep - 01 Oct	TAP
02 Sep - 08 Sep	Icelandair
05 Sep - 09 Sep	Spirit Airlines
05 Sep - 15 Sep	Icelandair
03 Sep - 12 Sep	Spirit Airlines
15 Sep - 25 Sep	TAP
05 Sep - 16 Sep	Icelandair
16 Sep - 21 Oct	Spirit Airlines
21 Sep - 11 Oct	TAP
29 Sep - 06 Oct	Aer Lingus
30 Sep - 25 Oct	Spirit Airlines
04 Sep - 01 Oct	Frontier Airlines
08 Sep - 04 Oct	Spirit Airlines

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 332€

Return flights