AirHint found the following cheapest return flights from Ontario (ONT) to Lisbon (LIS) in May 2026 (see full year).
Return flights
| 04 May - 11 May | Air France | ||
| 26 May - 08 Jun | Delta | ||
| 16 May - 26 May | Turkish Airlines | ||
| 22 May - 06 Jun | Alaska Airlines | ||
| 15 May - 19 May | Turkish Airlines | ||
| 26 May - 29 May | Turkish Airlines |
Also check the deals for one-way flights from Ontario to Lisbon in May.
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