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

Return flights

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

Also check the deals for one-way flights from Montreal to Quito 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 Quito in September from $434

Return flights