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

Return flights

29 Sep - 06 Oct	Delta
27 Sep - 06 Oct	Delta
28 Sep - 10 Oct	Delta
26 Sep - 30 Sep	Air France
23 Sep - 30 Sep	Delta
24 Sep - 01 Oct	Delta
29 Sep - 25 Oct	Virgin Atlantic
20 Sep - 11 Oct	Virgin Atlantic
25 Sep - 18 Oct	Virgin Atlantic
21 Sep - 28 Sep	Delta
23 Sep - 18 Oct	Virgin Atlantic
22 Sep - 18 Oct	Virgin Atlantic
26 Sep - 18 Oct	Frontier Airlines
21 Sep - 25 Sep	Virgin Atlantic
20 Sep - 22 Sep	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 $643

Return flights