Cheapest one-way flights from St. Louis to Toronto in December from 93€

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 Frontier Airlines
16 Dec Frontier Airlines
12 Dec Frontier Airlines
08 Dec Frontier Airlines
10 Dec Frontier Airlines
09 Dec Frontier Airlines
07 Dec Frontier Airlines
06 Dec Frontier Airlines
16 Dec Air Canada direct
17 Dec Air Canada direct

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

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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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