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

Return flights

08 Sep - 24 Sep	Avianca
15 Sep - 06 Oct	Avianca
10 Sep - 17 Sep	Avianca
07 Sep - 28 Sep	Delta
28 Sep - 06 Oct	Delta
28 Sep - 02 Oct	Delta
17 Sep - 28 Sep	Delta
09 Sep - 23 Sep	Delta
05 Sep - 19 Sep	Delta
03 Sep - 07 Oct	Delta
17 Sep - 01 Oct	Delta
11 Sep - 18 Sep	LATAM Airlines Group
15 Sep - 22 Sep	LATAM Airlines Group
17 Sep - 24 Sep	LATAM Airlines Group
16 Sep - 23 Sep	LATAM Airlines Group
24 Sep - 01 Oct	LATAM Airlines Group
25 Sep - 02 Oct	LATAM Airlines Group
30 Sep - 07 Oct	LATAM Airlines Group
29 Sep - 06 Oct	Avianca
28 Sep - 05 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 394€

Return flights