10,403.92 kilometres (6,464.71 miles)
6,464.71 miles (10,403.92 kilometres)
According to HowManyHours.com a flight from San Francisco to Buenos Aries is about 13 hours
Buenos Aires is 6 hours ahead of San Francisco.
From Mexico City to San Francisco Intl. it would take you some 4 and a half hours of flight.