This article compares migration discourses in traditional opinion surveys and social media in a cross-country perspective among five Englishspeaking countries. Despite the extensive survey research on migration, social media discussions on migration remain understudied, and little is known about its potential complementarity to survey findings. On the basis of automated content analysis, we present insights into the salience of and sentiment about migration by comparing both data sources. We also investigate which societal factors and framing of migration influence the salience of social media discussions. We find support that, overall, there is a good correlation between salience of and sentiment toward migration, both in surveys and on social media. We also demonstrate that societal factors significantly impact the salience of migration online. The observed dynamics may nevertheless differ depending on the sample of users, thus demonstrating the different incentives that motivate users to engage with the migration topic online. Methodologically, our contribution also demonstrates the necessity to reflect on the impact of different data collection strategies on the obtained findings.