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Solar flare events, as energetic outbursts of electromagnetic energy released from Sun, are well known driving agents for disturbances within Earth’s magneto sphere. D-region, as lowest ionospheric region, is strongly influenced by such powerful events as well. For probing D-region plasma properties in conditions perturbed due to the occurrence of high energy X-ray solar flare events, technology employing Very Low Frequency (VLF) radio signal transmission within Earth-ionosphere waveguide is used in this study. Monitoring and recording of related VLF signal perturbations was conducted by ground-based receiving system located in Belgrade, Serbia. Through applied numerical modeling procedure, retrieved ionospheric parameters revealed considerable deviations in electron density height profiles, with main results presented in this paper. Solar X-ray flux data were obtained from Geostationary Operational Environmental Satellite database.