Cheapest return flights from Ontario to Lisbon in August from $688

AirHint found the following cheapest return flights from Ontario (ONT) to Lisbon (LIS) in August 2026 (see full year).

Return flights

07 Aug - 14 Aug British Airways
03 Aug - 07 Aug British Airways
25 Aug - 07 Sep British Airways
22 Aug - 28 Aug British Airways
23 Aug - 05 Sep British Airways
30 Aug - 06 Sep British Airways

Also check the deals for one-way flights from Ontario to Lisbon in August.

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