AirHint found the following cheapest return flights from Ontario (ONT) to Barcelona (BCN) in December 2025 (see full year).
Return flights
| 07 Dec - 14 Dec | Frontier Airlines | ||
| 22 Dec - 07 Jan | Virgin Atlantic | ||
| 18 Dec - 03 Jan | Avianca |
Also check the deals for one-way flights from Ontario to Barcelona in December.
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