AirHint found the following cheapest one-way flights from San Francisco (SFO) to Barcelona (BCN) in December 2025 (see full year).
One-Way flights
| 31 Dec | TAP | ||
| 28 Dec | SWISS | ||
| 30 Dec | Lufthansa | ||
| 27 Dec | Lufthansa | ||
| 24 Dec | SWISS | ||
| 26 Dec | United | ||
| 25 Dec | SWISS | ||
| 23 Dec | Delta | ||
| 20 Dec | Lufthansa | ||
| 22 Dec | Lufthansa |
Also check the deals for return flights from San Francisco to Barcelona in December.
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