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

Return flights

27 Sep - 07 Oct	jetBlue
28 Sep - 07 Oct	jetBlue
02 Sep - 08 Sep	Frontier Airlines
05 Sep - 19 Sep	Condor
20 Sep - 04 Oct	jetBlue
10 Sep - 04 Oct	jetBlue
25 Sep - 18 Oct	jetBlue
02 Sep - 27 Sep	jetBlue
07 Sep - 23 Sep	Iberia
07 Sep - 18 Sep	Iberia
07 Sep - 19 Sep	Iberia
03 Sep - 10 Sep	Iberia
01 Sep - 10 Sep	Iberia
03 Sep - 01 Oct	Iberia
01 Sep - 15 Oct	Iberia
03 Sep - 17 Sep	Iberia
04 Sep - 18 Sep	Iberia
09 Sep - 04 Oct	Iberia
08 Sep - 04 Oct	Iberia
02 Sep - 05 Oct	Iberia

Also check the deals for one-way flights from Ontario 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 Ontario to Paris in September from $870

Return flights