About Passengers in Transit
Transiting without a visa is permissible for travelers continuing their trip within 24 hours to a third country provided that they have return or onward tickets and that they do not leave the transit area at the airport.
Any citizen in transit, that stays at the international lounge of the airport waiting for their next flight and will not go through Customs, does not need to apply for a visa.
Tourist visas are given to those who do need to go through customs, either to leave the airport or to simply pass through Customs and Border Security to collect luggage. Tourist visa applications must be submitted through https://tramites.minrel.gov.cl/ . Information about Tourist visa and requirements https://serviciosconsulares.cl/tramites/visa-de-permanencia-transitoria. Other types of Visa Applications must be submitted through https://tramites.extranjeria.gob.cl/ .
This information applies to all citizenships, over and under 18 years old passengers. If under 18-years-old passengers pass through customs, they must depart with both parents/legal guardians and if the minor travels unaccompanied or with only one parent, a travel authorization must be provided, in order to be allowed departure.