We establish two-point distortion theorems for sense-preserving planar harmonic mappings f=h+g¯¯¯�=ℎ+�¯ in the unit disk D� which satisfy harmonic versions of the univalence criteria due to Becker and Nehari. In addition, we also find two-point distortion theorems for the cases when h is a normalized convex function and, more generally, when h(D)ℎ(�) is a c-linearly connected domain.