Line A is the oldest line of the Buenos Aires Underground. Opened to the public on 1 December 1913, it was the first underground line in South America, the Southern Hemisphere and the Spanish-speaking world. It made Buenos Aires the 13th city in the world to have an underground transport service. The line stretches 9.8 km (6.1 mi) from Plaza de Mayo and San Pedrito and runs under the full length of the Avenida de Mayo and part of the Avenida Rivadavia, and is used by 258,000 people per day.
Once - 30 de Diciembre is a station on Line H of the Buenos Aires Underground and is located at the intersection of Pueyrredón and Rivadavia avenues in the neighbourhood of Balvanera. From here, passengers may transfer to the Plaza Miserere station on line A and, through it, transfer to the Once railway station, the central terminal of the Domingo Faustino Sarmiento Railway and Sarmiento Line.
Perú is a station on Line A of the Buenos Aires Underground. Passengers may transfer from here to the Catedral Station on Line D and to the Bolívar Station on Line E.
San Pedrito is a station on Line A of the Buenos Aires Underground and it is the current terminus of the line. The station was opened on 27 September 2013 as a part of the extension of the line from Carabobo.
San José de Flores is a station on Line A of the Buenos Aires Underground. The station connects with Flores station on the Sarmiento Line commuter rail service. The station was opened on 27 September 2013 as part of the extension of the line from Carabobo to San Pedrito.
Puan is a station on Line A of the Buenos Aires Underground. The station was opened on 23 December 2008 as part of the extension of the line from Primera Junta to Carabobo.
Primera Junta is a station on Line A of the Buenos Aires Underground. It lies at the intersection of Rivadavia Avenue and Del Barco Centenera street, in the neighborhood of Caballito and connects with Caballito station on the Sarmiento Line commuter rail service. The Buenos Aires Historic Tramway operates tram cars on a 12-block loop of street tracks used by rapid transit trains en route to the Polvorín Workshop. The station was opened on 1 July 1914 as the western terminus of the extension of the line from Río de Janeiro. It served as the line's terminus until 23 December 2008, when the line was extended to Carabobo.
Rio de Janeiro is a station on Line A of the Buenos Aires Underground. The station was opened on 1 April 1914 as the western terminus of the extension of the line from Plaza Miserere. On 1 July 1914 the line was extended to the west Primera Junta.
Loria is a station on Line A of the Buenos Aires Underground. The station was opened on 1 April 1914 as part of the extension of the line from Plaza Miserere to Río de Janeiro.
Pasco is a station on Line A of the Buenos Aires Underground. The station belonged to the inaugural section of the Buenos Aires Underground opened on 1 December 1913, which linked the stations Plaza Miserere and Plaza de Mayo. Like the Alberti station, it only has one platform, which in this case only serves passengers traveling to Plaza de Mayo. The other platform is located just a few meters away, but was closed in 1953 since the proximity of Alberti station meant having so many stops in such quick succession slowed the line's frequency.
Congreso is a station on Line A of the Buenos Aires Underground. It lies at the intersection of Rivadavia and Callao avenues, in the neighborhood of Balvanera. It is located just metres from the Palace of the Argentine National Congress. The station belonged to the inaugural section of the Buenos Aires Underground opened on 1 December 1913, which linked the stations Plaza Miserere and Plaza de Mayo.
Lima is a station on Line A of the Buenos Aires Underground. Passengers may transfer from here to the Avenida de Mayo station on Line C and Metrobus 9 de Julio. The station belonged to the inaugural section of the Buenos Aires Underground opened on 1 December 1913, which linked the stations Plaza Miserere and Plaza de Mayo.
Congreso de Tucumán is a station on Line D of the Buenos Aires Underground and is the current terminus. The station was opened on 27 April 2000 as the western terminus of the extension of the line from Juramento. It is located at the intersection of Cabildo and Congreso avenues. As of June 2015, the station connects to the Metrobus Cabildo bus rapid transit line that was opened that year. New underground passageways and station entrances were made for the station to provide easy transfer to the Metrobus line.
Corrientes Station is a station on Line H of the Buenos Aires Underground. The station was opened on 6 December 2010 as part of the one-station extension of the line from Once. It served as the line's north terminus until the extension of the line to Las Heras was completed on 18 December 2015. From here, passengers may transfer to the Pueyrredón Station on Line B.
Venezuela Station is a station on Line H of the Buenos Aires Underground. The station was opened on 18 October 2007, as part of the inaugural section of the line, between Once - 30 de Diciembre and Caseros.
Humberto I Station is a station on Line H of the Buenos Aires Underground. From here, passengers may transfer to Jujuy station on Line E. The station was opened on 18 October 2007, as part of the inaugural section of the line, between Once - 30 de Diciembre and Caseros.
Inclán - Mezquita Al Ahmad is a station on Line H of the Buenos Aires Underground. Here passengers may transfer to Metrobus Sur. The station was opened on 18 October 2007, as part of the inaugural section of the line, between Once - 30 de Diciembre and Caseros.
Caseros Station is a station on Line H of the Buenos Aires Underground. The station was opened on 18 October 2007, as the southern terminus of the inaugural section of the line, between Once - 30 de Diciembre and Caseros. It remained the line's southern terminus until the opening of Parque Patricios Station on 4 October 2011.
Parque Patricios Station is a station on Line H of the Buenos Aires Underground. It was inaugurated on 4 October 2011 as the southern terminus of one-station extension from Caseros. It remained the terminus of the line until 27 May 2013, when the line was extended to Hospitales.
Hospitales Station is a station and terminus on Line H of the Buenos Aires Underground. Here passengers may transfer to Metrobus Sur. It was opened on 27 May 2013 as a one-station extension from Parque Patricios. It is currently serving as the southern terminus of the line, until it is extended to Sáenz.
