AirHint found the following cheapest return flights from Ontario (ONT) to Porto (OPO) in March 2026 (see full year).

Return flights

10 Mar - 17 Mar	Iberia
24 Mar - 01 Apr	Iberia
29 Mar - 07 Apr	Iberia
01 Mar - 08 Mar	British Airways
26 Mar - 02 Apr	Iberia
26 Mar - 01 Apr	Iberia
02 Mar - 18 Mar	British Airways
19 Mar - 29 Mar	Iberia
20 Mar - 27 Mar	Iberia
25 Mar - 29 Mar	Iberia
25 Mar - 01 Apr	British Airways
21 Mar - 27 Mar	Iberia
09 Mar - 16 Mar	British Airways
28 Mar - 04 Apr	British Airways
22 Mar - 29 Mar	British Airways

Also check the deals for one-way flights from Ontario to Porto in March.

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 Porto in March from $661

Return flights