The study explored learners' punctuality and regularity on teaching-learning outcomes among Basic 8 learners at Millennium Precious Achievers Preparatory School in Gomoa-East Municipality, Ghana. Adopting an exploratory case study design, the researchers involved 11 participants: 8 learners selected via census sampling, 2 teachers and a headteacher chosen through purposive sampling. Grounded on Behavioural and Constructivist Theories, data was collected through in-depth interviews and classroom observations. This data was transcribed and analysed thematically using NVivo 12, with participant validation ensuring confirmability. Findings revealed a strong positive correlation between punctuality and academic performance, with punctual learners achieving significantly higher exam scores and demonstrating greater classroom engagement. Teachers reported substantial instructional time loss and classroom disruptions due to irregular attendance, negatively impacting lesson delivery and classroom cohesion. Key challenges identified included socioeconomic barriers, cultural norms, insufficient attendance monitoring, and peer influences. The study concluded that punctuality and regular attendance are critical determinants of academic success and effective lesson delivery. It recommends that the Ghana Education Service strengthen school attendance policies and enforcement through robust monitoring systems with clear consequences and positive reinforcement. Also include implementing socioeconomic support like transport subsidies, community childcare, particularly for vulnerable learners, and designing programmes to raise learner awareness about the importance of punctuality and regularity for academic success and future employability; build teacher capacity in class attendance management and enhancing parental and community engagement in school activities. These findings underscore the importance of a holistic approach to improving attendance behaviours to enhance teaching and learning outcomes.