AirHint found the following cheapest one-way flights from Ontario (ONT) to Athens (ATH) in December 2025 (see full year).
One-Way flights
| 14 Dec | Iberia | ||
| 16 Dec | Iberia | ||
| 01 Dec | British Airways | ||
| 11 Dec | Iberia | ||
| 15 Dec | British Airways | ||
| 17 Dec | Iberia | ||
| 21 Dec | Iberia | ||
| 18 Dec | Iberia | ||
| 19 Dec | British Airways |
Also check the deals for return flights from Ontario to Athens in December.
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