Cheapest one-way flights from Ontario to Barcelona in June from $626

AirHint found the following cheapest one-way flights from Ontario (ONT) to Barcelona (BCN) in June 2026 (see full year).

One-Way flights

26 Jun Frontier Airlines
05 Jun British Airways
09 Jun Iberia
17 Jun British Airways
30 Jun British Airways
11 Jun British Airways

Also check the deals for return flights from Ontario to Barcelona in June.

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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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