Cheapest return flights from St. Louis to Toronto in October from $440

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

Return flights

03 Oct - 07 Oct Frontier Airlines
11 Oct - 14 Oct Frontier Airlines
14 Oct - 16 Oct Delta
03 Oct - 06 Oct United
28 Oct - 04 Nov Air Canada direct
10 Oct - 13 Oct Delta

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

Skyscanner

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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