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

Return flights

30 Oct - 06 Nov	Spirit Airlines
15 Oct - 19 Oct	Frontier Airlines
02 Oct - 08 Oct	Spirit Airlines
03 Oct - 07 Oct	Southern Airways Express
03 Oct - 06 Oct	Southern Airways Express
04 Oct - 17 Oct	Frontier Airlines
06 Oct - 19 Oct	Frontier Airlines
11 Oct - 14 Oct	Frontier Airlines
09 Oct - 13 Oct	Spirit Airlines
07 Oct - 13 Oct	Frontier Airlines
05 Oct - 18 Oct	Spirit Airlines
30 Oct - 06 Nov	Air Canada	direct

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

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 October from $249

Return flights