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

Return flights

05 Sep - 17 Sep	United
25 Sep - 30 Sep	Avianca
27 Sep - 30 Sep	Avianca
09 Sep - 18 Sep	Avianca
16 Sep - 25 Sep	Avianca
09 Sep - 16 Sep	Avianca
13 Sep - 27 Sep	Avianca
28 Sep - 07 Oct	jetBlue
13 Sep - 23 Sep	Avianca
22 Sep - 02 Oct	jetBlue
06 Sep - 20 Sep	Avianca
13 Sep - 20 Sep	Avianca
29 Sep - 27 Oct	jetBlue
14 Sep - 08 Oct	jetBlue

Also check the deals for one-way flights from Ontario 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 Ontario to Guatemala City in September from $269

Return flights