Prior research has posited that flipped classrooms facilitate students' self-directed learning and enhance grades. Although reflective writing is one method linked to academic success, it rarely has been examined empirically in the literature within the context of flipped classrooms. The current study investigated the association between growth mindset-inspired reflective writing, self-regulated learning assessments, and academic performance in a fully flipped Introduction to Economics course. Regression analyses found that reflective writing effort and targeted self-directed learning scores were associated with higher grades on course assessments. These findings suggest that reflective writing that incorporates growth-mindset messaging should be encouraged in flipped classrooms.