Foz Do Iguacu is a city of around 300,000 people, and although it has an international airport it is pretty small. From memory, it has about seven gates- all on one level. Transport into the city centre is easy via public transport. Buses cost 1.85 reals and run every 20 minutes. Buses from the centro go also to the National park which is another four kilometers beyond the airport. Just check with the driver whether the bus is going to the "centro" if you are uncertain.  The bus fare is paid to the conductor who sits about a third of the way down the bus. After he has been paid you then can pass through a turnstile to get to the seats- not too easy if you are loaded with luggage. The bus terminus on Avenida Juscelino Kubitschek has a Tourist Information Office where they speak excellent English. To reach it however you have to pass through another turnstile!. Taxis from the airport should cost around 35-40 reals and always available for arrivals. If going direct from the airport to the Falls the costs of a taxi is cheap due to the falls being very close/

In 2014 the airport finished updated gates and terminal. LATAM, GOL, AZUL all serve IGU. LAN has 1 direct flight from and to Lima, Peru with the majority of the airlines in Brazil connecting via Sao Paulo, Rio or Campinas. There are many connection from all the major cites in Brazil to Foz. 

It should be noted to everyone to check the entry requirements from Brazil into and returning from Argentina and Paraguay. Prior to the recent World Cup the Brazil Immigration and Customs no longer man the "drive-up" windows. Therefore the need to stop at the Immigration's small office in order to have "Proof of entry" into Brazil. Since the closure of the drive-up windows the Policia Federal have began random "check points" to review passports and immigration papers. Additionally if you passed through the Brazilian border without stopping to have proof of entry there have been many incidents of arriving at the Foz airport only to be sent to the airports Policia Federal office in the airport to obtain the entry stamp. This office is first come, first served and line can be long. Under Brazilian Law the agents can FINE you $R 400.00 Reais per person for illegal entry.

Note: As of March 24, 2016 United States of America and Argentina has waived the Argentina Reciprocation Fee for each country. The Fee has now permanently been waived for USA citizens. Canada and AU still has the Reciprocation Fee which must be paid online prior to entering Argentina.