Since the nineties, a new migratory flow of Peruvians to Argentina have been activated as part of the South-South regional proximity dynamics. This article approaches, from a transnational perspective, the Peru-Argentina migratory field, oriented to Buenos Aires as a global city. The article inquiries about the dimensions of migrant transnationalism in the Metropolitan Area of Buenos Aires, as a part of globalized multipolar system. We used a qualitative approach—60 in-depth interviews—, with a selection based on an intentional theoretical sampling to study migratory trajectories of Peruvians, focusing on the migrant as a subject. Migrants and their families deploy mobilities and arrangements in the metropolitan territories, articulated in a transnational migratory space through three dimensions: family, cultural identity and citizenship, displaying logics of multiterritoriality and multiscalarity.