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

Return flights

22 Aug - 24 Aug	Spirit Airlines
01 Aug - 04 Aug	Spirit Airlines
22 Aug - 24 Aug	Air Canada	direct
01 Aug - 16 Aug	United	direct
01 Aug - 03 Aug	Spirit Airlines
14 Aug - 23 Aug	Air Canada	direct
12 Aug - 19 Aug	Air Canada	direct
15 Aug - 17 Aug	United
15 Aug - 17 Aug	Air Canada	direct
29 Aug - 31 Aug	Delta

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 $323

Return flights