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

Return flights

29 Sep - 06 Oct	Avianca
01 Sep - 19 Sep	Avianca
01 Sep - 22 Sep	Avianca
03 Sep - 10 Sep	Avianca
15 Sep - 22 Sep	Avianca
17 Sep - 24 Sep	Avianca
01 Sep - 10 Sep	Avianca
01 Sep - 21 Sep	Avianca
24 Sep - 01 Oct	Avianca
28 Sep - 05 Oct	Avianca
28 Sep - 06 Oct	Avianca
14 Sep - 22 Sep	Avianca
14 Sep - 21 Sep	Avianca
14 Sep - 29 Sep	Avianca
26 Sep - 03 Oct	LATAM Airlines Group
30 Sep - 07 Oct	LATAM Airlines Group
25 Sep - 02 Oct	LATAM Airlines Group
28 Sep - 20 Oct	Avianca
27 Sep - 04 Oct	LATAM Airlines Group

Also check the deals for one-way flights from Montreal 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 Montreal to Santiago in September from 392€

Return flights