The evolution of extended states with magnetic field and disorder intensities was discussed for two dimensional (2D) lattice models. When shift of the extended state, relative to the density of states, was properly taken into account, either for white-noise or correlated disorder, a floating-up picture was revealed. The results showed that the levitation of extended states in energy, relative to Landau band centers, can be quantitatively identified for both, white noise and correlated disorder, either as a function of decreasing magnetic field or increasing disorder strength.