The main international airport in Costa Rica is Juan Santamaría International Airport (SJO), which is located in the capital city of San José. This airport is the busiest in Costa Rica and serves as the main hub for international flights. If you are flying to Costa Rica from the United States or another international destination, you will most likely fly into Juan Santamaría International Airport.
There are also a few smaller airports in Costa Rica that serve international flights. These include Daniel Oduber Quirós International Airport (LIR) in Liberia, which is located in the northwest of the country, and Tobías Bolaños International Airport (SYQ) in San José, which is used primarily for domestic flights.
Depending on where you are coming from and what your travel plans are, you may want to consider flying into one of these smaller airports if it is more convenient for you. It is a good idea to check with your airline or a travel agent to determine the best airport for your needs.