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

Return flights

28 Sep - 08 Oct	Iberia
30 Sep - 07 Oct	Iberia
16 Sep - 24 Sep	British Airways
09 Sep - 10 Oct	Iberia
27 Sep - 08 Oct	British Airways
15 Sep - 25 Sep	British Airways
09 Sep - 14 Sep	Iberia
11 Sep - 18 Sep	Iberia
13 Sep - 08 Oct	Iberia
06 Sep - 14 Sep	Iberia
29 Sep - 11 Oct	Iberia
21 Sep - 06 Oct	Iberia
28 Sep - 12 Oct	Iberia
24 Sep - 11 Oct	Iberia
26 Sep - 10 Oct	Iberia
16 Sep - 26 Sep	British Airways
04 Sep - 17 Sep	British Airways
04 Sep - 18 Sep	British Airways
03 Sep - 18 Sep	British Airways
03 Sep - 10 Sep	British Airways

Also check the deals for one-way flights from Ontario to Madrid in September.

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 September from 427€

Return flights