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

Return flights

08 Sep - 19 Sep	Delta
01 Sep - 12 Sep	Delta
09 Sep - 16 Sep	Delta
09 Sep - 25 Sep	Delta
22 Sep - 02 Oct	Delta
08 Sep - 15 Sep	Air France
08 Sep - 22 Sep	Delta
04 Sep - 15 Sep	Delta
02 Sep - 08 Sep	Virgin Atlantic
16 Sep - 10 Oct	Delta
05 Sep - 14 Sep	Porter Airlines (Canada) Ltd
02 Sep - 06 Sep	Porter Airlines (Canada) Ltd
22 Sep - 05 Oct	Delta
26 Sep - 03 Oct	Delta
25 Sep - 12 Oct	KLM
30 Sep - 02 Oct	Virgin Atlantic
30 Sep - 03 Oct	Virgin Atlantic

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 407€

Return flights