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

Return flights

31 Jul - 05 Aug	Spirit Airlines
31 Jul - 04 Aug	Spirit Airlines
09 Jul - 13 Jul	Spirit Airlines
18 Jul - 20 Jul	Spirit Airlines
05 Jul - 12 Jul	Frontier Airlines
31 Jul - 04 Aug	Air Canada	direct
04 Jul - 06 Jul	Spirit Airlines
04 Jul - 06 Jul	United	direct

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

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 July from $399

Return flights