AirHint found the following cheapest one-way flights from Washington (IAD) to San Jose (SJO) in January 2026 (see full year).
One-Way flights
| 23 Jan | United | ||
| 18 Jan | United | ||
| 21 Jan | United | ||
| 24 Jan | Avianca | direct | |
| 27 Jan | Avianca | ||
| 25 Jan | Avianca | ||
| 30 Jan | Avianca |
Also check the deals for return flights from Washington to San Jose in January.
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