Beautiful Hummingbird is restricted to south central Mexico. It occurs from central Guerrero and southern Puebla south to Oaxaca (Binford 1989, Howell and Webb 1995). Specimens also are reported from Distrito Federal, Morelos, and Chiapas (Friedmann et al. 1950); Howell and Webb (1995) consider all of these records as suspect (but have not re-examined the specimens in question?).
Beautiful Hummingbird occurs primarily in interior valleys, with an elevational range of 1000-2200 m (Howell and Webb 1995). This species usually is considered to be resident (e.g. Binford 1989), but Howell and Webb (1995) indicate that some individuals descend to near sea level in southeastern Oaxaca in the nonbreeding season (December-April).