General Requirements:
A valid passport is required for U.S. citizens to enter Argentina. U.S. citizens do not need a visa for visits of up to 90 days for tourism or business. U.S. citizens who arrive in Argentina with expired or damaged passports may be refused entry and returned to the United States at their own expense. The U.S. Embassy cannot provide guarantees on behalf of travelers in such situations, and therefore encourages U.S. citizens to ensure that their travel documents are valid and in good condition prior to departure from the United States.
To renew the 90 day tourist card you must visit the Dirección Nacional de Migraciones (National Immigration Office) in Buenos Aires (Avenida Antártida, Argentina 1355, C1104ACA Buenos Aires. Tel: 4137-0234. info@migraciones.gov.ar. Monday to Friday 8 a.m. to 1 p.m.). It is advisable to get in touch beforehand to confirm opening hours. Ask for “prorrogas de permanencia” and you must pay a $35 fee. It is very crucial to monitor the duration of time you have been inside Argentina. If the 90 days expire without any renewal you could be fined up to $200 per day and in some instances be refused renewal. In some provinces renewal can be done at the Federal Police Office although this is not guaranteed and therefore somewhat risky. It is important to note that extensions are only granted once.
General Consulates of Argentina: