AirHint found the following cheapest one-way flights from Washington (DCA) to San Juan (SJU) in December 2025 (see full year).
One-Way flights
| 10 Dec | United | ||
| 31 Dec | Delta | ||
| 13 Dec | United | ||
| 15 Dec | United | ||
| 11 Dec | Southwest Airlines | ||
| 07 Dec | jetBlue | ||
| 09 Dec | United | ||
| 07 Dec | jetBlue | direct | |
| 25 Dec | Delta | ||
| 05 Dec | United |
Also check the deals for return flights from Washington to San Juan in December.
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