Cheapest one-way flights from St. Louis (STL) to Toronto (YYZ), September

Select a price to book. see full year.

Dates, airline, and price
Dates Airline Price
17 Sep American Airlines
16 Sep American Airlines
21 Sep Frontier Airlines
13 Sep Southern Airways Express
25 Sep Frontier Airlines
15 Sep Southern Airways Express
14 Sep Frontier Airlines
11 Sep Frontier Airlines
10 Sep Frontier Airlines
25 Sep Air Canada
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deals for return flights from St. Louis to Toronto in September.

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Updated Aug 27, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

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