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We examined the relationships between teaching, social, and cognitive presence within the Community of Inquiry framework, academic procrastination, and achievement among non-traditional online students in South Korea. An online survey of 801 participants measured the three presences and academic procrastination, while Grade Point Average (GPA) represented achievement. Multiple regression and the Johnson-Neyman technique revealed that cognitive presence fully mediated the effects of teaching and social presence on GPA, while social presence partially mediated the influence of teaching presence on cognitive presence. Cognitive presence moderated the relationship between academic procrastination and GPA, with GPA decreasing at low procrastination levels but increasing at high levels. A one-way MANOVA showed that students with lower procrastination had significantly higher cognitive presence across all sub-constructs.