AirHint found the following cheapest return flights from Montreal (YUL) to Santiago (SCL) in September 2026 (see full year).

Return flights

24 Sep - 01 Oct	Copa
02 Sep - 09 Sep	Copa
15 Sep - 22 Sep	Copa
16 Sep - 23 Sep	Copa
17 Sep - 24 Sep	Copa
22 Sep - 29 Sep	Copa
09 Sep - 16 Sep	Copa
30 Sep - 07 Oct	Copa
23 Sep - 30 Sep	Copa
08 Sep - 15 Sep	Copa
28 Sep - 05 Oct	Copa
07 Sep - 14 Sep	Copa
11 Sep - 18 Sep	Avianca
25 Sep - 02 Oct	Avianca
26 Sep - 03 Oct	Copa

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 376€

Return flights