The Brazilian side is located in Foz do Iguaçu, Paraná state, Brazil, inside of the Iguaçu National Park. Local airport is called Cataratas International Airport - IGU. Several flights in and out, most from and to Rio de Janeiro and São Paulo, as business are yet recovering, international flights should be back soon. The Iguaçu National Park is the home of the Iguassu Falls, located just 5 minutes from the IGU airport. There is a Visitor’s Center with English-speaking staff to help visitors enter the National Park. The National Park has its own transportation for those who wish to go on their own for a day at the Falls. Departures every 20 minutes, also one can pay for the Entrance fee locally with credit cards. Lockers, bathrooms, cafeteria and souvenirs shop available as well. They do not accept foreign currency but You can pay with credit card or Brazilian Reais R$ 83.00 which is at the moment around U$ 20.00, depending on U$ x R$ exchange rates. You can check it and pay for it directly in the following link, which is the one for the company that runs the Iguaçu National Park - Brazil.