AirHint found the following cheapest one-way flights from Ontario (ONT) to San Salvador (SAL) in December 2025 (see full year).
One-Way flights
| 27 Dec | Frontier Airlines | ||
| 31 Dec | Frontier Airlines | ||
| 30 Dec | United | ||
| 29 Dec | Volaris | ||
| 28 Dec | American Airlines | ||
| 26 Dec | American Airlines | ||
| 27 Dec | Avianca | direct | |
| 28 Dec | Avianca | direct |
Also check the deals for return flights from Ontario to San Salvador in December.
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