Cheapest one-way flights from St. Louis to Toronto in May from $149
AirHint found the following cheapest one-way flights from St. Louis (STL) to Toronto (YYZ) in May 2025 (see full year).
One-Way flights
| 28 May | Frontier Airlines | ||
| 19 May | Air Canada | direct | |
| 14 May | Air Canada | direct | |
| 28 May | Air Canada | direct |
Also check the deals for return flights from St. Louis to Toronto in May.
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.
