This dataset contains anonymised quantitative survey data from 161 Indonesian Generation Z migrants residing in European Union countries. The study examined how comparative evaluations of uncertainty in origin and destination contexts are associated with aspirations to remain in Europe. The dataset includes item-level survey responses and composite indices measuring Geopolitical Awareness, European Security Uncertainty, Media Security Exposure, Social Inclusion, European Opportunity, Comparative Uncertainty, and Core Stay Aspiration. Direct identifiers and potentially identifying contextual information were removed or generalised before deposit. Qualitative interview data are not included because the small number of participants and contextual detail could permit re-identification. The dataset supports the article “Comparative Uncertainty and Stay Aspirations among Indonesian Generation Z Migrants in the European Union.”