AirHint found the following cheapest return flights from Dayton (DAY) to San Juan (SJU) in December 2025 (see full year).
Return flights
| 06 Dec - 13 Dec | Delta | ||
| 16 Dec - 20 Dec | United | ||
| 17 Dec - 23 Dec | United | ||
| 23 Dec - 04 Jan | Allegiant Air |
Also check the deals for one-way flights from Dayton to San Juan in December.
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