AirHint found the following cheapest one-way flights from Washington (IAD) to San Jose (SJO) in December 2025 (see full year).
One-Way flights
| 03 Dec | Frontier Airlines | ||
| 11 Dec | Frontier Airlines | ||
| 12 Dec | Frontier Airlines | ||
| 13 Dec | United | direct | |
| 25 Dec | Volaris El Salvador | ||
| 27 Dec | Volaris El Salvador | ||
| 16 Dec | Copa | ||
| 30 Dec | Copa | ||
| 31 Dec | Copa | ||
| 01 Dec | Copa |
Also check the deals for return flights from Washington to San Jose in December.
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