A sudden explosion causes the generation of high temperature and pressure which hit the nearby structures subjecting them to an impulsive loading. This produces sudden unwanted vibrations in structures which often lead to structural failure. Functionally graded (FG) material could be an excellent choice for engineers to combat this situation due to its high thermal resistance and high stiffness. It is from this perspective that, a dynamic response analysis is carried out in this paper to investigate the vibration characteristics of stiffened FG panels due to a free air blast loading. The functionally graded panel is modelled following the finite element approach in the ANSYS platform to obtain its free vibration parameters. Subsequently, these parameters along with the geometry data of the panel are exported to the MATLAB platform where an in-house code is developed to perform the transient dynamic response due to the blast loading. The blast pressure is also calculated using an in-house developed MATLAB code following the Brode Model. Numerical simulations involving different types of unstiffened and stiffened FG panels have been carried out. The results reveal that the stiffened FG panels are quite effective to increase the sustainability of the structures due to a blast.