AirHint found the following cheapest one-way flights from Washington (DCA) to San Jose (SJO) in December 2025 (see full year).
One-Way flights
| 14 Dec | United | ||
| 16 Dec | jetBlue | ||
| 15 Dec | United | ||
| 09 Dec | Southwest Airlines | ||
| 28 Dec | Southwest Airlines | ||
| 25 Dec | jetBlue |
Also check the deals for return flights from Washington to San Jose in December.
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