The article focuses on the financial issues and family background of Erasmus students. It examines the costs of Erasmus study periods in the academic year 2004/05 and the socio-economic background of Erasmus students that year, based on over 15000 survey responses. Results are compared with those of a similar survey undertaken in 1998 to track changes over the last decade. The main question that the article addresses is whether international mobility of higher education students within the Erasmus programme has been expanded to more students from lower socio-economic backgrounds during this period. We find that, in spite of still important socio-economic barriers to the take-up of the programme, access has been moderately widened.