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

Return flights

09 Dec - 16 Dec	Air Canada
11 Dec - 17 Dec	United	direct
09 Dec - 16 Dec	United	direct
13 Dec - 16 Dec	United	direct
17 Dec - 23 Dec	United	direct
26 Dec - 17 Jan	Air Canada
26 Dec - 17 Jan	Air Canada	direct
19 Dec - 26 Dec	United	direct
19 Dec - 28 Dec	Air Canada	direct
20 Dec - 04 Jan	Air Canada	direct

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 119€

Return flights