AirHint found the following cheapest return flights from Miami (MIA) to Toronto (YYZ) in September 2025 (see full year).

Return flights

27 Sep - 04 Oct	Spirit Airlines
23 Sep - 30 Sep	WestJet
25 Sep - 29 Sep	Frontier Airlines
26 Sep - 28 Sep	Frontier Airlines
25 Sep - 29 Sep	American Airlines	direct
25 Sep - 28 Sep	WestJet
20 Sep - 17 Oct	American Airlines
20 Sep - 21 Sep	United
21 Sep - 28 Sep	American Airlines
19 Sep - 21 Sep	American Airlines
19 Sep - 20 Sep	American Airlines
18 Sep - 20 Sep	American Airlines
20 Sep - 17 Oct	American Airlines	direct

Also check the deals for one-way flights from Miami to Toronto in September.

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 Miami to Toronto in September from $370

Return flights