Local bus from Puerto Iguazú to the Argentine Side of Iguazu Falls
First you need to make your way to the Puerto Iguazú bus terminal and find the location where the local bus pickups people going to the Argentine side of the falls. They leave every 20 minutes and the bus take around 25 minutes or more if there are locals onboard stopping along the way. For more convenient and quicker transport, you can book a daily shuttle to the Argentine falls with guide.
There is no local bus from the Argentine falls to the Puerto Iguazu airport. A convenient way to see the falls and then get dropped off at the airport after is by taking a private transfer which allows you to take your luggage with you.
Local bus from Puerto Iguazú to the Brazil Side of Iguazu Falls
There are 2 companies that run local buses from the Puerto Iguazú bus terminal to the entrance of the Brazil side of the falls. They depart every hour and do allow time at the immigration, before continuing on.
If you want to be picked up from your hotel and get through immigration quicker, then take the daily shuttle to the Brazil side. Or for a better customized service, then check out the private transfer from Puerto Iguazú, which will take you across the border and to the falls. These are ideal if you want to be dropped off at a hotel in Foz do Iguacu or the airport in Brazil after the falls.