AirHint found the following cheapest one-way flights from Washington (IAD) to San Jose (SJO) in December 2025 (see full year).
One-Way flights
| 06 Dec | United | ||
| 08 Dec | Delta | ||
| 06 Dec | Avianca | direct | |
| 08 Dec | Avianca | direct | |
| 09 Dec | Avianca | direct | |
| 11 Dec | Avianca | direct | |
| 12 Dec | United | ||
| 25 Dec | Copa | ||
| 18 Dec | Avianca | direct | |
| 24 Dec | Allegiant Air |
Also check the deals for return flights from Washington to San Jose in December.
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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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