Cheapest one-way flights from St. Louis to Toronto in December from $275

AirHint found the following cheapest one-way flights from St. Louis (STL) to Toronto (YYZ) in December 2025 (see full year).

One-Way flights

17 Dec Air Canada direct

Also check the deals for return flights from St. Louis to Toronto in December.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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