Density, refractive index and speed of sound at 298.15 K, together with isobaric vapor-liquid equilibria data (VLE) at 101.3 kPa are reported for two binary mixtures, methanol + ethyl lactate and I-propanol + ethyl lactate. Excess molar volumes on mixing were determined from the experimental data and consequently fitted with Redlich-Kister polynomials. VLE experimental data were tested by Dechema test, which proved their thermodynamic consistency. The activity coefficients were correlated with the Margules, van Laar, UNIQUAC, NRTL, and Wilson equations. The Analytical Solutions of Groups and Universal quasichemical Functional group Activity Coefficients models were also used for the prediction. Investigated binary systems did not show any azeotrope.