Isothermal vapor-liquid equilibrium (VLE) data for the binary systems propane + dimethyl ether and propene + dimethyl ether were determined experimentally with the static synthetic and the static analytic methods. Additionally, excess enthalpy (H-E) data were determined by means of an isothermal flow calorimeter. For the system propane + dimethyl ether, the azeotropic compositions were derived graphically from the VLE data. The experimental data from this work were correlated by using a linear temperature dependence for the UNIQUAC interaction parameters and by treating the real vapor phase behavior with the Soave-Redlich-Kwong equation of state. On the basis of this correlation, the new data were compared to values taken from the literature.