Abstract. There is increasing evidence that international migration is characterized by frequent return and onward migration. This has important consequences for the contribution of immigrants to the economy of the host country. Lack of longitudinal data has prevented much analysis of how frequently international migration involves a sequence of location decisions or how long the typical migrant stays in a host country. A newly available longitudinal data set covering all immigrants to Canada since 1980 provides the opportunity to address these issues. The results show that a large fraction of male immigrants who are of working age, especially among skilled workers and entrepreneurs, are highly internationally mobile.