Local bus 109 goes to the airport, 10km northeast of town on the Posadas road. A taxi costs around AR$200.
Bus 103 runs between the local bus terminal and the long-distance bus terminal via downtown. A taxi to/from the long-distance bus terminal will cost AR$80 to AR$90.
Buses cost AR$8, payable only with a Sube charge card, available from some kiosks and usable in many other cities around the country. If you don't have a card other passengers are usually willing to swipe their card if you give them the cash fare.