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

Return flights

07 Oct - 21 Oct	British Airways
07 Oct - 24 Oct	Iberia
06 Oct - 15 Oct	Iberia
07 Oct - 15 Oct	British Airways
06 Oct - 16 Oct	Iberia
12 Oct - 21 Oct	Iberia
08 Oct - 23 Oct	Iberia
08 Oct - 22 Oct	Iberia
01 Oct - 16 Oct	Iberia
12 Oct - 23 Oct	Iberia
28 Oct - 04 Nov	British Airways
28 Oct - 11 Nov	Iberia
27 Oct - 10 Nov	British Airways
29 Oct - 05 Nov	British Airways
27 Oct - 05 Nov	British Airways
29 Oct - 07 Nov	British Airways
25 Oct - 04 Nov	Iberia
26 Oct - 03 Nov	British Airways
22 Oct - 01 Nov	Iberia

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

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 October from 427€

Return flights