AirHint found the following cheapest one-way flights from St. Louis (STL) to Toronto (YYZ) in January 2026 (see full year).
One-Way flights
| 17 Jan | Frontier Airlines | ||
| 18 Jan | Frontier Airlines | ||
| 18 Jan | Air Canada | direct | |
| 17 Jan | Air Canada | direct | |
| 20 Jan | United |
Also check the deals for return flights from St. Louis to Toronto in January.
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