  We examine the problem of three generation quark flavor mixing in realistic,
superstring derived standard--like models, constructed in the free fermionic
formulation. We study the sources of family mixing in these models and discuss
the necessary conditions to obtain a realistic Cabibbo--Kobayashi--Maskawa
(CKM) mixing matrix. In a specific model, we estimate the mixing angles and
discuss the weak CP violating phase. We argue that the superstring
standard--like models can produce a realistic CKM mixing matrix. We discuss the
possible textures of quark mass matrices that may be obtained in these models.
