To get to Rancagua, you can take a flight from Santiago to the Rancagua International Airport, located about 20 km from the city. It is also possible to arrive by bus from Santiago and other cities in the country, since Rancagua has a bus station that connects with various cities in the region and the country.
If you prefer to drive, you can take the Ruta 5 Sur highway that connects Santiago with Rancagua and it takes approximately 1 hour and a half to get there.