AirHint found the following cheapest return flights from Greenville (GSP) to San Juan (SJU) in December 2025 (see full year).
Return flights
| 09 Dec - 16 Dec | United | ||
| 22 Dec - 31 Dec | Allegiant Air | ||
| 12 Dec - 03 Jan | Allegiant Air |
Also check the deals for one-way flights from Greenville to San Juan in December.
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