Abstract
In this paper, we investigate the existence and Ulam-Hyers-Rassias stability results for a class of boundary value problems for implicit psi-Caputo fractional differential equations with non-instantaneous impulses involving both retarded and advanced arguments. The results are based on the Banach contraction principle and Krasnoselskii's fixed point theorem. In addition, the Ulam-Hyers-Rassias stability result is proved using the nonlinear functional analysis technique. Finally, illustrative examples are given to validate our main results.