The ERASMUS Programme, established in June 1987, is considered one of the most popular European education programmes as it favours the academic mobility of thousands of students. Given the importance of ERASMUS in building a Europe of knowledge, this article aims to analyse the importance of ERASMUS toPortugal since its implementation. The state of the art on the subject is not exhaustive. Although much research on student mobility with a focus on ERASMUS at the European level has been undertaken – albeit difficult to summarise given the diversity of studies – Portuguese literature has not kept pace since existing studies are mainly Masters dissertations of a qualitative nature, supported by interviews with former ERASMUS students and covering the recent years of the Programme. Bearing this in mind, this article, in addition to identifying the main stages that led to the establishment of the Programme and highlighting thecontours of its implementation in Portugal, seeks to analyse the participatory trends of Portuguese students attending the first university cycle (the so-called outgoings) from 1987 to 2014, the year ERASMUS+ started.