The paper analyses the modes of reorganization of the "self" of migrant women in a study about the Peruvian migration in the Chilean city of Arica, in the border area between Chile and Peru. After describing the social and historical context of the city, I will detail the methodology developed for the study. Following the perspective of transnational migration studies, I will analyze some fundamental theoretical considerations on the concept of simultaneity, which will be defined as a dialectical relationship in three dimensions. To illustrate my reflections, I will narrate examples of situations and dialogues of the fieldwork which evidence the particular "self" constructions of Peruvian migrant woman. Through these examples, I will discuss the simultaneous and transnational production of migrant "selves".