In this work, effect of thermal cycling on the flexural properties of fiber-metal laminate (FML) has been evaluated. FML plates were composed by two aluminium 2024-T3 and a epoxy polymer-matrix composites ply formed by four layers of basalt fibers. For FML samples the thermal cycle times were about 6 min for temperature cycles from 25 °C to 115 °C. Flexural properties were evaluated on samples after 20, 35 and 55 thermal cycles, and compared to non-exposed samples. While the thermal cycling decreased the flexural strength of chemical treated FML (etched aluminium), increasing at first, and then decreasing after a while was observed in electrochemical treated FML (anodized aluminium). The flexural modulus of FML showed irregularly changes for both of FML with anodized aluminium and FML with etched aluminium. The energy absorption of FML with etched aluminium showed a sharp decline with increasing thermal cycling while the energy absorption of FML with anodized aluminium showed a Low and irregular changes. Evaluation optical microscope showed that the mechanism of failure for the FML with etched aluminium after thermal cycling changed from failure of FML to separation between layers of FML, while for the FML with anodized aluminium before and after thermal cycling it was failure of FML and it has not changed.