AirHint found the following cheapest one-way flights from Ontario (ONT) to Singapore (SIN) in December 2025 (see full year).
One-Way flights
| 29 Dec | STARLUX Airlines | ||
| 31 Dec | Japan Airlines | ||
| 30 Dec | China Airlines | ||
| 28 Dec | Qatar Airways |
Also check the deals for return flights from Ontario to Singapore in December.
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