A side loading packaging machine for packaging articles in containers comprising: a section for forming containers starting from die-cuttings, comprising at least one feeding device, a loading section, a closing section, substantially aligned along a longitudinal axis of the machine; further comprising a conveyor equipped with transportation members configured to carry at least one of said containers each, wherein said conveyor comprises motor means arranged to drive the advance of said transportation members or groups thereof in an independent manner, and the machine operates with: a continuous formation of boxes, said feeding member working with a continuous movement and with a constant rate over time, and said transportation members advancing with a continuous movement at said forming section; and a static loading, said transportation members being stationary during the loading of articles into the containers.