Coming from abroad you will probably get into SP from GRU Airport. You must know in advance this airport is about 25/30 Km from downtown São Paulo, and for the ride you will mostly find a lot of traffic.
A cab into the city or to the local airport has a fixed price and will range from R$130-R$150 if you order at the cashier for Guarucoop. An UberX can range from R$60-R$80 depending on traffic, but if you are traveling solo and want a cheaper and comfy option, this shuttle might be the best.
For only R$43/person you could get a bus to either República (metro station), Paulista Av, Itaim, Brooklin or Congonhas Airport. Each of this routes have their own time and schedule.
Bus is comfortable, has A/C and a space to carry your luggage. Some of them have a functional WiFi and TV. read more