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High-ignitability spark plugs are increasingly being used in high-efficiency gasoline engines. However, studies regarding combustion simulation for predicting spark plug effectiveness, which consider the engine conditions and misfire phenomenon, are rare. Therefore, a method was developed for predicting ignitability through simulation of the spark plug using detailed chemical kinetics. In this method, the ignition process is initiated by introducing an energy source obtained from actual discharge waveforms into the spark discharge region. Detailed chemical kinetics are considered for prediction of misfires. Schlieren photographs and calculation results were compared and analyzed, targeting propane fuel combustion in the combustion chamber. The predictability of the effect of plug shapes and discharge positions on ignitability was confirmed for two types of spark plugs in a static field. Spark curves and ignitability are significantly affected in flow fields.