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

Return flights

02 Sep - 16 Sep	Air Transat
17 Sep - 26 Sep	Air Transat
27 Sep - 02 Oct	Air Transat
22 Sep - 03 Oct	Air Transat
27 Sep - 04 Oct	Aer Lingus
16 Sep - 25 Sep	Porter Airlines (Canada) Ltd
04 Sep - 15 Sep	Air France	direct
10 Sep - 28 Sep	Air France	direct
22 Sep - 03 Oct	Air France	direct
09 Sep - 09 Oct	Air France	direct
16 Sep - 02 Oct	Air France	direct
02 Sep - 16 Sep	Air France	direct
17 Sep - 29 Sep	WestJet
26 Sep - 30 Sep	WestJet
19 Sep - 12 Oct	Air France	direct
28 Sep - 04 Oct	WestJet

Also check the deals for one-way flights from Ottawa 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 Ottawa to Paris in September from 511€

Return flights