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

Return flights

22 Sep - 30 Sep	Hawaiian Airlines
01 Sep - 12 Sep	British Airways
03 Sep - 09 Sep	British Airways
09 Sep - 19 Sep	British Airways
07 Sep - 18 Sep	British Airways
08 Sep - 16 Sep	British Airways
03 Sep - 01 Oct	British Airways
08 Sep - 24 Sep	British Airways
10 Sep - 19 Sep	British Airways
19 Sep - 03 Oct	Iberia
25 Sep - 07 Oct	Iberia
21 Sep - 06 Oct	Iberia
03 Sep - 08 Sep	British Airways
01 Sep - 15 Sep	British Airways
21 Sep - 04 Oct	British Airways
27 Sep - 04 Oct	British Airways
29 Sep - 05 Oct	British Airways
20 Sep - 05 Oct	Iberia
25 Sep - 04 Oct	British Airways
30 Sep - 15 Oct	jetBlue

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 $672

Return flights