AirHint found the following cheapest return flights from Sioux Falls (FSD) to San Juan (SJU) in December 2025 (see full year).
Return flights
| 04 Dec - 08 Dec | Frontier Airlines | ||
| 29 Dec - 07 Jan | Frontier Airlines | ||
| 28 Dec - 07 Jan | Allegiant Air | ||
| 26 Dec - 05 Jan | Frontier Airlines | ||
| 27 Dec - 05 Jan | Allegiant Air |
Also check the deals for one-way flights from Sioux Falls to San Juan in December.
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