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

Return flights

23 Sep - 05 Oct	Copa
24 Sep - 02 Oct	Copa
24 Sep - 01 Oct	Copa
25 Sep - 02 Oct	Air Transat
29 Sep - 02 Oct	Porter Airlines (Canada) Ltd
29 Sep - 06 Oct	WestJet
30 Sep - 07 Oct	Avianca
23 Sep - 08 Oct	Porter Airlines (Canada) Ltd
23 Sep - 30 Sep	Copa
17 Sep - 22 Sep	Copa
18 Sep - 05 Oct	Air Transat
28 Sep - 05 Oct	Porter Airlines (Canada) Ltd
21 Sep - 22 Sep	Air Transat
17 Sep - 25 Sep	Avianca
25 Sep - 27 Sep	Air Transat
25 Sep - 29 Sep	Air Transat
20 Sep - 29 Sep	Air Transat
20 Sep - 27 Sep	Air Transat
21 Sep - 28 Sep	Air Transat
19 Sep - 26 Sep	Aeromexico

Also check the deals for one-way flights from Montreal to Guatemala City 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 Guatemala City in September from 307€

Return flights