AirHint found the following cheapest return flights from St. Louis (STL) to Toronto (YYZ) in August 2025 (see full year).

Return flights

07 Aug - 10 Aug	Spirit Airlines
28 Aug - 31 Aug	Spirit Airlines
28 Aug - 31 Aug	Air Canada	direct
13 Aug - 16 Aug	Air Canada	direct
01 Aug - 16 Aug	Spirit Airlines
03 Aug - 09 Aug	Delta
03 Aug - 09 Aug	Air Canada	direct
01 Aug - 03 Aug	Air Canada	direct
07 Aug - 10 Aug	Air Canada	direct

Also check the deals for one-way flights from St. Louis to Toronto in August.

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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Cheapest return flights from St. Louis to Toronto in August from $344

Return flights