Out of all the popular cities in Argentina, Puerto Iguazú is the cheapest city to rent a car in at just $8/day. Renting a car in Puerto Iguazú is 83% cheaper than renting one in Ushuaia where the per day rate is around $47. Other fairly inexpensive cities in Argentina to get a rental car in are: San Miguel de Tucumán ($24/day), Salta ($25/day), and Buenos Aires ($28/day). While these cities typically have cheaper prices than the rest of the country, travelers looking to rent a car in Buenos Aires should expect to spend around $28/day on their transportation. The most popular city to rent a car in Argentina is Buenos Aires.