When large numbers of people gather in a limited space for a considerable amount of time, the possibility of spreading infectious disease increases, which can stress the health care system of the host country. It is essential to design strategies to tackle the threat of geographically widespread pandemics. In this study, we investigate and analyze pandemic 2009 influenza a H1N1 in the Hajj which is one of the biggest mass gathering in the world. Using SIR models combining both stochastic and deterministic models to study the prevalence of disease among mass migrations, we explain how to incorporate a meta-population model with a mobility process.