Abstract: A method for managing a vertical flight plan comprises: a first step of breaking down an initial flight plan into a succession of contiguous segments, each segment comprising a change of altitude and/or of speed; a second step of calculating a lateral flight path of the flight plan based on the contiguous segments; a third step of calculating a vertical profile and a speed profile based on the calculated lateral flight path; a fourth step is a step of determining an active segment during the flight of the aircraft, by longitudinal distance sequencing of the contiguous segments. The method is notably suitable for the integration of tactical flight segments into a flight plan.