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

Return flights

23 Sep - 25 Sep	WestJet
20 Sep - 27 Sep	WestJet
19 Sep - 21 Sep	Avelo Airlines
17 Sep - 18 Sep	Spirit Airlines
19 Sep - 20 Sep	Spirit Airlines
23 Sep - 25 Sep	WestJet	direct
22 Sep - 25 Sep	Air Canada	direct
19 Sep - 22 Sep	WestJet	direct
20 Sep - 27 Sep	WestJet	direct
19 Sep - 20 Sep	Air Canada	direct

Also check the deals for one-way flights from Detroit 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 Detroit to Toronto in September from $394

Return flights