Why go
The bus network fills gaps left by the metro and can reach parts of the city that are awkward on foot. It is most useful when a route combines a central landmark with a more distant neighbourhood or the coast.
The full story
Porto's buses are most helpful at the edges of a walking itinerary. The historic centre is compact enough to explore slowly, but hills and longer links can make a bus a sensible bridge between districts. This is especially relevant when a destination is away from a metro station or when the day includes the coast or a more residential part of the city. Traffic can affect journey times, so avoid treating a bus connection as an exact-minute transfer between timed bookings. Use the operator's current route planner to confirm stops, service patterns and ticketing before setting out. If a route is short and steep, compare the walk with the bus rather than assuming the map distance tells the whole story.