International student migration (ISM) is one of the fastest growing categories of migrants in Canada. Drawing on the narratives of 30 international students at a Canadian university, this paper investigates international students’ decisions to study overseas and the roles of social networks in shaping mobility. We find that international students negotiate information while embedded in multiple social networks consisting of family, friends, ethnocultural and religious communities, and professional relations in origin and settlement countries. These social networks exceed typical knowledge and connection functions; they act as informal migration agents, providing transnational care and guidance, and ‘do’ family in ways that shape mobility decisions and settlement. The information provided through these networks, however, can be inaccurate or incomplete, requiring the strategic mobilization of new networks to support migration. We conclude that international student mobility relies on building transnational networks to support knowledge transfer, provide care and offer tangible supports. Furthermore, we argue that these fluctuating local and transnational social networks should be more fully recognized in the theorizing of ISM and in strategies implemented for supporting international students.