A sorting conveyor has pivotally mounted flaps for sorting articles into sorting outlets as a function of a sorting indication affixed to each of the articles. The conveyor includes a monitoring and control unit designed to cause each flap to pivot between a closed position in which the flap forms a conveyor portion suitable for conveying an article in a certain conveying direction and an open position in which the flap interrupts conveying of an article on the conveyor to deflect it towards an appropriate sorting outlet. The monitoring and control unit is also arranged to retrieve thickness data from a memory giving a certain thickness for the article to be deflected, and to respond by causing the flap to pivot into an open position through a certain opening amplitude determined as a function of the thickness data about the article that is to be deflected.