Buses crisscross Porto’s avenues and streets daily, from 06:00 to 21:00. The Sociedade de Transportes Colectivos do Porto also runs special night buses, but with less frequency. The city doesn’t have a central bus hub but there are major stands at the Jardim da Cordoaria (near the Torre dos Clérigos, Praça da Liberdade (at the bottom of the Avenida dos Aliados and the Rotunda da Boavista (Boavista Roundabout).
You can purchase an individual ticket from the driver, or blocks of tickets in advance (a cheaper option) from a newsstand or an STCP office. Single day or multi-day travel passes are also available. The Cartão Andante (Andante Card) is good for all types of public transportation and can save you time and money. The cards range from one day to an entire month and can be purchased at the airport, train stations and tube stops. If you’re planning on staying in Porto for a while, you can select the Azul (blue) or Andante Gold Card, depending on how often you’ll be using public transport.
The Yellow Bus sightseeing tours go out to Matosinhos and Foz, and wind through Porto and Vila Nova de Gaia. A single ticket is valid for the entire route. STCP runs the tours and the tickets are good for discounts at many city landmarks.