AirHint found the following cheapest return flights from St. Louis (STL) to Toronto (YYZ) in October 2025 (see full year).
Return flights
| 30 Oct - 02 Nov | Spirit Airlines | ||
| 22 Oct - 29 Oct | Frontier Airlines | ||
| 19 Oct - 25 Oct | Southern Airways Express | ||
| 22 Oct - 29 Oct | Air Canada | direct | |
| 19 Oct - 25 Oct | Air Canada | direct |
Also check the deals for one-way flights from St. Louis to Toronto in October.
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