AirHint found the following cheapest one-way flights from Washington (IAD) to San Jose (SJO) in January 2026 (see full year).
One-Way flights
| 02 Jan | United | ||
| 09 Jan | Frontier Airlines | ||
| 08 Jan | Frontier Airlines | ||
| 10 Jan | Frontier Airlines | ||
| 15 Jan | Frontier Airlines | ||
| 04 Jan | Frontier Airlines | ||
| 04 Jan | United | direct | |
| 20 Jan | Copa | ||
| 21 Jan | Copa | ||
| 23 Jan | Copa |
Also check the deals for return flights from Washington to San Jose in January.
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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.
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