Perovskite oxyhydrides may find diverse applications, ranging from catalysis, topochemical synthesis to solid state ionics, but the understanding of their hydride transport behavior has remained limited. Here, gaseous hydrogen exchange and release experiments were analyzed using the Kissinger method to estimate the activation energy (E_a) for H/D exchange and H₂ release in BaTiO_3–xH_x (x = 0.35–0.60) and LaSrCoO₃H_0.70. It is revealed that, for each BaTiO_3–xH_x at a given hydride concentration (x), both H/D exchange and H₂ release experiments provide similar Ea values. For BaTiO_3–xH_x with different x, the obtained Ea values significantly decrease with increasing x until around 0.4; beyond 0.4, it becomes nearly constant (200–220 kJ mol^–1). This observation suggests that the diffusion process in the low hydride concentration (x < 0.4) includes oxide as well as hydride diffusion, whereas, for 0.4 < x (<0.75), only hydride migrates, with second-nearest-neighbor (2NN) jumps as a rate-determining process, which is...