AirHint found the following cheapest return flights from Ontario (ONT) to Madrid (MAD) in May 2026 (see full year).

Return flights

01 May - 11 May	British Airways
04 May - 30 May	British Airways
05 May - 19 May	Iberia
05 May - 12 May	Iberia
06 May - 13 May	Iberia
16 May - 28 May	Iberia
01 May - 12 May	Iberia
01 May - 14 May	Iberia
08 May - 15 May	Iberia
01 May - 08 May	Iberia
14 May - 05 Jun	Iberia
15 May - 06 Jun	Iberia
08 May - 01 Jun	Iberia
24 May - 03 Jun	Iberia
11 May - 06 Jun	Iberia
12 May - 06 Jun	Iberia
28 May - 02 Jun	British Airways
27 May - 01 Jun	Iberia
25 May - 25 Jun	British Airways
29 May - 08 Jun	British Airways

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

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 May from 699€

Return flights