Punctuality is an important social behavior at the workplace and in everyday life. This study analyzed the influence of personality on behavioral indicators of punctuality in a real-life setting. The study consisted of two parts: participants first completed a personality questionnaire at home and then joined a psychological group experiment some days later. Analyses focused on three objective behavioral indicators of punctuality: time of arrival, earliness, and lateness. As expected, the Big Five personality factors predicted punctuality: conscientiousness was related to all aspect of punctuality, agreeableness predicted time of arrival as well as earliness and neuroticism was related to earliness. Possible directions for future research are outlined.