The airport is 10km north of the city. Take bus 715 (AR$10, 30 minutes) from the corner of Blvd Marítimo and Belgrano. Taxis cost from around AR$150, depending on where you're going.
Despite Mar del Plata’s sprawl, frequent buses reach just about every place in town. However, most buses (including the airport bus) require tarjetas de aproximación (magnetic cards) that must be bought ahead of time at kioscos (newsstands) and charged up.
The webpage www.cualbondi.com.ar/mar-del-plata provides useful maps of all local bus routes. The tourist office can also help with transportation details.
Car rentals are available downtown at Alamo.