Research has shown that the potential benefits of a flipped classroom could be diminished by the way students perceive and prepare information prior to class. This study aims to explore individual characteristics, such as learner motivation, self‐efficacy and epistemology beliefs, that might have an impact on learning outcomes in a flipped classroom. Data were collected using four instruments during a 7‐week flipped classroom conducted from mid‐September 2014 to mid‐November 2014 with a total enrolment of 85 students (10 females and 75 males) in the required course, Applied English for Vocational Education. After controlling for pre‐test and other covariates (eg, gender, grade and experience), an analysis based on structural equation modeling showed a positive and significant (β = 0.12, p < 0.05) indirect effect of instrumentality (promotion) on the change in test scores through averaged quiz scores. Beliefs had a significant positive effect on change in scores between pre‐ and post‐tests (β = 0.20, p < 0.05). Findings revealed that language learners with a high level of motivation in instrumentality (promotion) followed quiz mechanisms closely and thus benefited most from the flipped classroom. Learners with high beliefs exhibited improvement in the post‐tests without doing well in quizzes. The implications for a flipped language learning classroom are discussed, including multiple strategies for regulating learners of different personal traits to preview the online course content before class.