AirHint found the following cheapest return flights from St. Louis (STL) to Toronto (YYZ) in December 2025 (see full year).
Return flights
| 06 Dec - 13 Dec | American Airlines | ||
| 24 Dec - 30 Dec | American Airlines | ||
| 06 Dec - 13 Dec | Air Canada | direct | |
| 24 Dec - 30 Dec | Air Canada | direct | |
| 19 Dec - 24 Dec | Delta |
Also check the deals for one-way flights from St. Louis to Toronto in December.
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