STI
Cibao International Airport
Quick answer
12% of air arrivals, around 1 million passengers a year, heavily used by the diaspora. From the airport to central Santiago: taxi about $15-20, 20 minutes.
The airport trick
No intercity bus departs directly from the air terminals. The right pattern is: short ride from the airport to the bus stop, then the intercity guagua. Guagualine solves both pieces in a single booking.