Effective engagement during online learning is essential for achieving successful student outcomes. This study aims to determine the level of engagement among undergraduate students and its influencing factors during the online learning process. Data were collected from a sample of 609 undergraduate students, taken from four public and private universities in Malaysia. Results showed that undergraduate students have a moderate level of engagement during online learning. Their engagement was significantly influenced by perceptions of online learning, experiences in online learning, and online self-regulation skills, as demonstrated by the results of partial least square-structural equation modeling (PLS-SEM). These factors accounted for 63.7% of the variance in students' engagement (R[superscript 2] = 0.637, p < 0.01). The implications of the study were discussed.