This paper explores the determinants of interregional migration in Indonesia. Employing basic and modified (extended) gravity models, and using data from the Indonesia censuses of 2000 and 2010 and the Intercensal Survey of 2005, we test Long’s hypothesis that in the early stage of population redistribution, economic development is positively related to a concentration of the population. Using per capita GDP as a proxy for income as well as an indicator for economic development, we found that migration in Indonesia is indeed directed towards more developed regions. This finding further supports the notion that regional disparity in development is an important factor in interregional migration in Indonesia. In line with classic gravity models, our findings show that distance is negatively related to the size of migration flows. However, unlike previous findings on inter-provincial migration in Indonesia, our descriptive finding shows indications that the friction of distance has weakened.