AirHint found the following cheapest return flights from Ontario (ONT) to Madrid (MAD) in August 2025 (see full year).

Return flights

12 Aug - 21 Aug	Iberia
13 Aug - 20 Aug	Iberia
13 Aug - 03 Sep	British Airways
14 Aug - 21 Aug	Iberia
11 Aug - 21 Aug	Iberia
05 Aug - 21 Aug	Iberia
10 Aug - 30 Aug	British Airways
20 Aug - 24 Aug	Iberia
12 Aug - 19 Aug	British Airways
19 Aug - 19 Sep	British Airways
18 Aug - 19 Sep	British Airways
10 Aug - 20 Aug	British Airways
14 Aug - 19 Aug	British Airways
24 Aug - 10 Sep	British Airways
31 Aug - 10 Sep	British Airways
26 Aug - 10 Sep	British Airways
26 Aug - 19 Sep	British Airways
30 Aug - 11 Sep	British Airways
28 Aug - 03 Sep	Iberia
27 Aug - 03 Sep	British Airways

Also check the deals for one-way flights from Ontario to Madrid 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 Ontario to Madrid in August from 449€

Return flights