Domestic Flights in Costa Rica... There are two principal domestic carriers in Costa Rica: Sansa and Nature Air. Both airlines also offer flights to some other Central American countries either directly or through partners, as is the case with SANSA through Grupo TACA members.
Popular destinations to fly to from San Jose are Tortugero and Corcovado. This is owing to the remoteness of this places and the amount of time it takes to reach them via land. Other common flights are the beach destinations of Tamarindo and Manuel Antonio. Whether you plan to get around Costa Rica by air or land depends on where you want to visit and the amount of time you have to spend. There are many more economic forms of transportation that are also convenient, such as shuttle transfers, that allow you to see Costa Rica close up. That said flying at 15000 feet offers a superb vista of this countries amazing terrain and it is fast.
SANSA uses the international airport of Alajuela, Juna Santamaria, as its base. This is convenient for those connecting with international flights. Nature Air uses the Tobias Bolaños airport in Pavas (San Jose) as its base of operations. This is close to the downtown area and most hotels, sight and shopping.
There are three major airports in Costa Rica. They are located in Alajuela, Pavas and Liberia. Most international flights go though Juan Santamaria in Alajuela but more and more flights are starting to make stops in Liberia. Both have capacities for landing large commercial jets and are modern airports current radar and ILS runways for service in poor weather. Pavas receives both domestic and international flights made by small aircraft.
Nature Air offers domestic flights as well as services to Nicaragua and Panama. Daily flights to a number of destinations in Costa Rica, look up times and rates before you make reservations.