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

Return flights

16 Aug - 23 Aug	Air Canada	direct
12 Aug - 13 Aug	Air Canada	direct
10 Aug - 12 Aug	Air Canada	direct
11 Aug - 15 Aug	Air Canada	direct
13 Aug - 13 Aug	United
14 Aug - 14 Aug	United
01 Aug - 05 Aug	Air Canada	direct
10 Aug - 14 Aug	United	direct
09 Aug - 12 Aug	United	direct
16 Aug - 19 Aug	United	direct
25 Aug - 01 Sep	Air Canada	direct
29 Aug - 02 Sep	Air Canada	direct
30 Aug - 02 Sep	Air Canada	direct
29 Aug - 01 Sep	Air Canada	direct
30 Aug - 01 Sep	Air Canada	direct

Also check the deals for one-way flights from Chicago to Toronto in August.

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 August from 144€

Return flights