Cheapest return flights from Ontario to Porto in May from $1193

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

Return flights

13 May - 23 May Iberia
06 May - 13 May Iberia
14 May - 30 May Iberia
20 May - 27 May Turkish Airlines
21 May - 28 May Iberia
22 May - 29 May Turkish Airlines
27 May - 25 Jun Iberia
25 May - 01 Jun Iberia
09 May - 16 May British Airways
23 May - 30 May British Airways

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

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