AirHint found the following cheapest return flights from Ontario (ONT) to Porto (OPO) in April 2026 (see full year).
Return flights
| 18 Apr - 29 Apr | Iberia | ||
| 10 Apr - 17 Apr | Iberia | ||
| 29 Apr - 06 May | Iberia | ||
| 17 Apr - 24 Apr | Iberia | ||
| 08 Apr - 15 Apr | British Airways | ||
| 11 Apr - 18 Apr | British Airways |
Also check the deals for one-way flights from Ontario to Porto in April.
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