The development of chemical kinetic models is a hierarchical process. In order to develop reliable models for C3 and C4 alcohols, the kinetics of key stable intermediates species needs to be addressed fully. One such deficiency in these models has been the kinetic treatment of large molecular weight oxygenated intermediate species such as the C3 and C4 aldehydes. This issue is addressed in this investigation by performing a combined experimental and modeling study of the oxidation of propanal. Laminar flame speeds of propanal/air flames were determined over a wide range of equivalence ratios at atmospheric pressure and elevated unburned mixture temperatures. Additionally, the oxidation of propanal was additionally studied in a jet stirred reactor at 10 atm again over a wide range of equivalence ratios and temperatures, covering both low temperature and high temperature oxidation regimes. These experimental results were simulated using a newly developed detailed chemical kinetic model.