Line A is a planned light rail line of the Santiago Metro, whose construction is planned to begin in 2027 and whose opening is planned in 2032. It is intended to connect the Arturo Merino BenÃÂtez International Airport to Line 7 (which is under construction and planned to be opened in 2028) and to the rest of the metro network. It will add 2 new stations and of track to the metro system. It will start at the future Huelén interchange station in Cerro Navia, connecting it withàLine 7, and will end in the northwest, at the future Aeropuerto Internacional Arturo Merino BenÃÂtez station of the airport in Pudahuel. When the line is opened, Santiago will become one of first cities in South America with a direct connection between its metro network and its international airport, after São Paulo/Guarulhos International Airport, Recife International Airport and Porto Alegre International Airport and the first outside Brazil. The entire line will be underground. Its distinctive color on the network line map is turquoise. The cost of construction has been set at $365 million USD.
On May 14, 2025, the newspaperàDiario Financieroàreported that theàPresident of Chile,àGabriel Boric, would announce in theàpublic accountàof that year the project of aàlight railàthat would connect the futureàLine 7àwith theàArturo Merino BenÃÂtez International Airport.àWith an estimated length of , the metro line would connect the airport with the future Huelén metro station located on Avenida Mapocho Sur inàCerro Naviaàin approximately 7 minutes.
Finally, before theàNational Congress of Chile, President Boric announced on June 1, 2025, the construction of Line A, which would be a light rail line connecting the country's main airport and the Huelén station of Line 7. The Minister of Transport and Telecommunications,àJuan Carlos Muñoz, noted that the fare for Line A will be higher than the rest of the metro network (reaching approximately 3,000àChilean pesos), the total investment will be approximately $365 million USD, and it is expected to be operational by 2032, carrying around 9.5 million passengers per year.
On June 2, President Boric visited the municipality of Cerro Navia, where he and other authorities provided further details of the future Line A. He reported that the line will be long and will cross theÃÂ Costanera NorteÃÂ andÃÂ ÃÂ highways. It will have two stations, one in each municipality, with platform screen doors and accessibility for the disabled. It will also meet the standards of the carriages currently operating on LinesÃÂ 3ÃÂ andÃÂ 6, with automatic train operation, air conditioning, and onboard security cameras.