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

Return flights

09 Dec - 15 Jan	British Airways
30 Dec - 24 Jan	British Airways
30 Dec - 08 Jan	British Airways
11 Dec - 08 Jan	British Airways
23 Dec - 17 Jan	British Airways
25 Dec - 08 Jan	British Airways
02 Dec - 04 Dec	British Airways
08 Dec - 12 Dec	Air Canada
05 Dec - 07 Dec	Air Canada
03 Dec - 27 Dec	Air Canada
07 Dec - 27 Dec	Air Canada
22 Dec - 08 Jan	KLM
21 Dec - 08 Jan	KLM
08 Dec - 19 Dec	Air Canada
07 Dec - 21 Dec	Air Canada
10 Dec - 19 Dec	Air Canada
19 Dec - 07 Jan	Frontier Airlines
14 Dec - 03 Jan	Alaska Airlines
04 Dec - 27 Dec	Avianca
02 Dec - 27 Dec	Avianca

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

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 December from $735

Return flights