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

Return flights

04 Dec - 08 Dec	Frontier Airlines
04 Dec - 07 Dec	Frontier Airlines
12 Dec - 13 Dec	Spirit Airlines
11 Dec - 07 Jan	Frontier Airlines
29 Dec - 14 Jan	Spirit Airlines
26 Dec - 29 Dec	Spirit Airlines
26 Dec - 29 Dec	Air Canada	direct
04 Dec - 07 Dec	Air Canada	direct
11 Dec - 07 Jan	Air Canada	direct
12 Dec - 13 Dec	Delta	direct
04 Dec - 08 Dec	Delta	direct
29 Dec - 14 Jan	Delta	direct
20 Dec - 27 Dec	WestJet	direct
05 Dec - 07 Dec	WestJet	direct

Also check the deals for one-way flights from Detroit to Toronto in December.

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 December from $253

Return flights