AirHint found the following cheapest return flights from Washington (IAD) to San Juan (SJU) in December 2026 (see full year).
Return flights
| 17 Dec - 21 Dec | United | ||
| 17 Dec - 22 Dec | United | ||
| 17 Dec - 20 Dec | United | ||
| 11 Dec - 19 Dec | Delta | ||
| 23 Dec - 07 Jan | United | ||
| 22 Dec - 02 Jan | American Airlines |
Also check the deals for one-way flights from Washington to San Juan in December.
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