In this work, the measurements of the isobaric vapor-liquid equilibrium (VLE) data at 101.32 kPa and the excess molar volumes (nu(E)), obtainer. at 10 K intervals of temperature in the range (288.15 to 328.15) K, for four binary systems comprised of methyl or ethyl butanoate with two alkanes (heptane and nonane) are presented. The nu(E) are positive for the four mixtures, and their variation with temperature presents a thermal coefficient (partial derivative nu(E)/partial derivative T)(p) > 0, and the behavior of these systems is interpreted. Experimental VLE data (p,T,x,y), obtainer in a small capacity ebulliometer, present a positive consistency according to the method of Fredenslund. The methyl butanoate + heptane system presents a minimum boiling-temperature azeotrope with the following coordinates at the working pressure: (x(l,az) = 0.404; T-az = 367.65 K). Measurements of (T,p(i)(o)) are also shown for all of the compounds and were determined using the same equilibrium equipment. Experimental data are correlated with an appropriate polynomial model proposed by the authors. A simultaneous correlation is performed for the characteristic VLE properties and the h(E) values taken from the literature. For the correlation of properties of methyl butanoate + heptane system, values of c(p)(E) from the literature were included in the correlation process. In all cases the multiproperty goodness of fit is acceptable. Another correlation procedure by successive steps in the order (x,c(p)(E))->(x,h(E))->(x,g(E)) is also applied when the experimental data exist for the binaries studied; the results obtained with both procedures are similar. The universal functional activity coefficient (UNIFAC) method is applied to estimate the VLE values, h(E) and c(p)(E), with different results. The VLE prediction is acceptable in all cases except for the methyl butanoate + heptane mixture, although the estimation of the other thermodynamic quantities is not adequate.