Sturla Viajes You can take the Sturla boat straight to Tigre from Puerto Madero. Boats leave Puerto Madero at 10am (journey time two hours) and make the return trip from Tigre's Estación Fluvial at 4pm.
Certain branches of the 60 bus go to Tigre from Constitución station via Plaza Italia in Palermo; check with the driver. Look for the bus marked 'Panamericana' which takes the highway (1½ hours).
You can take the Tigre branch of the Mitre line train (with/without SUBE AR$6/12) from Retiro (one hour) or Belgrano C (45 minutes).
The most scenic way to reach Tigre is via the Tren de la Costa, whose southernmost station (Maipú) is in the suburb of Olivos. The Mitre train from Retiro will take you to Maipú (get off at Mitre station at the end of the line and cross the pedestrian bridge to Maipú). You can also reach Maipú station on the 152 bus, which stops at Plaza Italia in Palermo.