Vapour pressures of butanone +1-propanol or +2-propanol at seven temperatures between 278.15 and 323.15 K were measured by a static method. Excess molar enthalpies and volumes were also measured at 298.15 K. Following Barker’s method, the activity coefficients and the excess molar Gibbs free energies were fitted to the Wilson correlation. Mixtures containing 2-propanol show azeotropy with a minimum boiling temperature. The thermodynamic excess functions are discussed with respect to the molecular interactions and compared with those for binary mixtures containing the same alcohols with other solvents.