Ac conductivity of (Pb0.67La0.22)(Zr0.2Ti0.8)O3 thin films has been investigated by impedance spectroscopy. Thin films have been grown by pulsed laser deposition (PLD) and by PLD assisted by radiofrequency discharge in oxygen. A cubic perovskite structure similar to that of the target has been found by XRD analysis. The ac conductivity of the films has been studied as a function of the frequency, ac driving field and dc bias field amplitudes. We found a power law dependence on frequency at short time scale (high frequencies) and/or low field amplitude, while at low frequencies and/or high field amplitude the dc conductivity contribution was dominant. Measurements at high dc field (up to 150 kV/cm) indicate that films grown by RF-PLD have the ac conductivity decreased by one order of magnitude with respect to PLD-grown films.