PUBLIC TRANSIT: A TRAVEL GUIDE TO TRANSPORTATION IN BUENOS AIRES

The public transport in Buenos Aires is very good, although crowded during rush hour. The metro network is not very large, but reaches most tourist attractions of the city, and there is a large range of bus routes and several suburban railways used by commuters.
Finding your way around is easy. Most of the city grid is divided into equal squares with block number in the hundreds. Most streets are one way with the adjacent parallels going the other way, so beware that the bus or taxi won't follow the same route back. Going by taxi, you simply need to tell the driver the street and block number, eg. "Santa Fe 2100"; or two intersecting streets, eg. "Corrientes y Callao".
City maps are issued by many different publishers (Guía T, LUMI) and the local tourist authority. They are indispensable for those wanting to use public transportation, since they include all bus routes.
Also, you can check out this website: http://www.comoviajo.com/

By Bus
The principal means of public transportation within the city are the buses (“colectivos”). They have a cheap maximum fixed price as long as you are moving inside the city borders (1,10 peso to 1.25 pesos) . Tickets can only be bought on the bus, through a machine that accepts COINS ONLY! Therefore, KEEP COINS IN YOUR WALLET!
On most services, board the bus and tell the driver your destination (or do what Argentines do -- just say, "un peso diez, por favor" meaning you'll be traveling a normal distance and want to pay 1,10 pesos) ; he will press a button instructing the coin machine to take a certain amount of money for you, which will then appear on the machine as the amount to insert. Step a bit further back into the bus and insert coins into the machine which now knows your destination and has calculated your fare because the driver punched it in. You will receive change and your ticket automatically; collects it at the bottom of the machine.
There are more than one hundred lines, covering the whole city. They work 24 hours a day, the whole year; but run less frequently on holidays and at late hours. For each route the bus is painted differently to make them easier to distinguish. The best way to figure out the bus system is to buy a Guía "T". It's essentially a little book with a directory of streets, which correspond to map pages, and have a bus listing on the facing page for each map. These can be bought at many pavement kiosks around the city, or subway stations.

By Taxi
Going by taxi, you simply need to tell the driver the street and block number, eg. "Santa Fe 2100"; or two intersecting streets, eg. "Corrientes y Callao".

By Metro (subway or underground)

The city has a metro network ("subte", short form of "subterráneo", which means "underground"). It is very efficient - you can gain a lot of time by using it - and very cheap too (1.10 pesos for any combination)

The lines converge to the downtown area and connect the main bus and train terminals.
In the southeast branch (the E line), the service is extended by a trainway known as premetro, but beware, it goes to some of the least secure places in the city.
The subte works approximately from 5 am to 10 pm, except on Sundays, when service starts at 8 am.
Transferring between lines is indicated by “combinación” signs.
While tokens have been used in the past, at present, riders purchase either single-use or multi-use cards (called “SubtePass”) with a magnetic strip or use Contactless cards called Monedero (for more information, visit: http://www.monedero.com.ar/) which can be rechargeable with cash or linked to a bank account for automatic. It is currently accepted at all Subway stations, many Open 24 hours shops, The Coffee Store, and also get discounts in a few other stores.