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

Return flights

14 Sep - 29 Sep	Delta
24 Sep - 21 Oct	Delta
03 Sep - 01 Oct	Delta
03 Sep - 17 Sep	Delta
14 Sep - 22 Sep	Delta
03 Sep - 07 Sep	Delta
06 Sep - 22 Sep	Delta
07 Sep - 19 Sep	Delta
14 Sep - 24 Sep	Delta
17 Sep - 03 Oct	Delta
02 Sep - 09 Sep	LATAM Airlines Group
03 Sep - 10 Sep	LATAM Airlines Group
08 Sep - 15 Sep	LATAM Airlines Group
24 Sep - 01 Oct	LATAM Airlines Group
29 Sep - 06 Oct	LATAM Airlines Group
30 Sep - 07 Oct	LATAM Airlines Group
26 Sep - 05 Oct	Delta
25 Sep - 02 Oct	LATAM Airlines Group
26 Sep - 03 Oct	LATAM Airlines Group
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 438€

Return flights