AirHint found the following cheapest one-way flights from Fresno (FAT) to San Diego (SAN) in January 2026 (see full year).
One-Way flights
| 08 Jan | Hawaiian Airlines | direct | |
| 12 Jan | Hawaiian Airlines | direct | |
| 01 Jan | Southwest Airlines | direct | |
| 14 Jan | Southwest Airlines | direct | |
| 09 Jan | Alaska Airlines | direct | |
| 11 Jan | Alaska Airlines | direct |
Also check the deals for return flights from Fresno to San Diego in January.
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