AirHint found the following cheapest one-way flights from Ontario (ONT) to Barcelona (BCN) in December 2025 (see full year).
One-Way flights
| 02 Dec | Iberia | ||
| 04 Dec | British Airways | ||
| 01 Dec | Iberia | ||
| 30 Dec | Iberia | ||
| 08 Dec | Iberia | ||
| 15 Dec | Iberia | ||
| 05 Dec | Iberia | ||
| 18 Dec | Iberia | ||
| 25 Dec | Iberia | ||
| 24 Dec | British Airways |
Also check the deals for return flights from Ontario to Barcelona in December.
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