AirHint found the following cheapest one-way flights from Ontario (ONT) to Guatemala City (GUA) in May 2026 (see full year).
One-Way flights
| 12 May | United | ||
| 16 May | United | ||
| 19 May | Volaris | ||
| 24 May | Volaris | ||
| 20 May | Volaris | ||
| 23 May | Volaris | ||
| 25 May | Volaris | ||
| 06 May | Avianca | ||
| 07 May | Avianca |
Also check the deals for return flights from Ontario to Guatemala City in May.
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