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

Return flights

09 Sep - 27 Sep	WestJet
09 Sep - 23 Sep	WestJet
16 Sep - 07 Oct	WestJet
17 Sep - 08 Oct	WestJet
02 Sep - 09 Sep	WestJet
10 Sep - 24 Sep	WestJet
30 Sep - 21 Oct	Porter Airlines (Canada) Ltd
01 Sep - 08 Sep	Porter Airlines (Canada) Ltd
16 Sep - 05 Oct	WestJet
03 Sep - 10 Sep	Porter Airlines (Canada) Ltd
17 Sep - 10 Oct	WestJet
30 Sep - 10 Oct	WestJet

Also check the deals for one-way flights from Ottawa to Santiago 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 Santiago in September from $734

Return flights