Systems and methods are disclosed for managing energy of a UAV during flight. In particular, the disclosed systems and methods assist in safely returning a UAV to ground while reducing diversionary time for providing energy to the UAV. In one or more embodiments, the disclosed systems and methods calculate a measure of remaining energy with regard to a UAV flying a mission plan and a measure of landing energy needed to travel to a landing station. The disclosed systems and methods can select a transition point from a mission plan and route leading from the mission plan to the landing station by comparing the calculated measure of remaining energy and the calculated measure of landing energy. Moreover, the disclosed system and methods can modify a mission plan to include the selected transition point and route.