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

Return flights

30 Dec - 01 Jan	United
30 Dec - 02 Jan	United
17 Dec - 31 Dec	Spirit Airlines
25 Dec - 31 Dec	United	direct
25 Dec - 06 Jan	United	direct
25 Dec - 07 Jan	United	direct
22 Dec - 08 Jan	Frontier Airlines
27 Dec - 31 Dec	United	direct
27 Dec - 30 Dec	United
26 Dec - 30 Dec	United
31 Dec - 03 Jan	WestJet
25 Dec - 01 Jan	United	direct
27 Dec - 01 Jan	United	direct
20 Dec - 05 Jan	WestJet
19 Dec - 28 Jan	Frontier Airlines
24 Dec - 31 Dec	Frontier Airlines
24 Dec - 31 Dec	United	direct
22 Dec - 29 Dec	United	direct
19 Dec - 31 Dec	Frontier Airlines
21 Dec - 31 Dec	Frontier Airlines

Also check the deals for one-way flights from Chicago 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 Chicago to Toronto in December from $272

Return flights