Santiago Airport begins to allow foreign travelers to enter, all travelers (of all ages) will have to present three documents when boarding:
•A completed “Affidavit of Travelers” electronic form (available here and also known as a Sanitary Passport) prepared less than 48 hours before boarding;
•Proof of a negative result from a PCR result from a test taken within 72 hours prior to departure; and
•Proof of a health insurance policy that provides coverage for COVID-19 and related health issues up to a minimum of 30,000 USD during the traveler’s stay in Chile.
Children under the age of 2 are exempt from presenting a COVID-19 test.
Travelers with proof of recovery from the virus within the last 90 days prior to boarding. Proof of a recent positive viral test and a letter from your healthcare provider or a public health official stating that you were cleared to travel.
More info at the CDC site
Travelers who did not get tested, are advised to stay home and self-quarantine for 10 days after travel.