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

Return flights

30 Sep - 14 Oct	British Airways
24 Sep - 30 Sep	British Airways
23 Sep - 30 Sep	British Airways
30 Sep - 08 Oct	British Airways
25 Sep - 02 Oct	British Airways
29 Sep - 25 Oct	British Airways
26 Sep - 30 Sep	British Airways
30 Sep - 25 Oct	British Airways
26 Sep - 03 Oct	British Airways
30 Sep - 11 Oct	British Airways
26 Sep - 29 Sep	British Airways
25 Sep - 28 Sep	British Airways
24 Sep - 18 Oct	British Airways
23 Sep - 18 Oct	British Airways
27 Sep - 18 Oct	British Airways
29 Sep - 30 Sep	British Airways
24 Sep - 26 Sep	British Airways
22 Sep - 26 Sep	British Airways

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

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 September from 1160€

Return flights