AirHint found the following cheapest return flights from Ontario (ONT) to Barcelona (BCN) in August 2025 (see full year).

Return flights

03 Aug - 19 Aug	Iberia
17 Aug - 24 Aug	Iberia
17 Aug - 08 Sep	British Airways
31 Aug - 09 Sep	Iberia
16 Aug - 27 Aug	Iberia
12 Aug - 20 Aug	British Airways
11 Aug - 20 Aug	British Airways
11 Aug - 22 Aug	British Airways
06 Aug - 20 Aug	British Airways
22 Aug - 05 Sep	British Airways
31 Aug - 08 Sep	Iberia
14 Aug - 22 Aug	British Airways
09 Aug - 30 Aug	Iberia
08 Aug - 26 Aug	British Airways
31 Aug - 13 Sep	British Airways
19 Aug - 01 Sep	British Airways
08 Aug - 01 Sep	British Airways
27 Aug - 10 Sep	British Airways
25 Aug - 06 Sep	British Airways
25 Aug - 08 Sep	British Airways

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

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 Barcelona in August from $617

Return flights