In the increasingly competitive coffee shop market, particularly in urban centers, customer loyalty is essential for long-term sustainability and brand success. This study explores the determinants of customer loyalty in Kuala Lumpur’s coffee shop sector by examining the roles of consumer susceptibility to interpersonal influence, perceived quality, and brand image. This quantitative study employed a structured questionnaire with a sample of 403 respondents. Regression analysis revealed that consumer susceptibility to interpersonal influence significantly predicts customer loyalty, emphasizing the impact of peer endorsements, social norms, and identity alignment in shaping loyalty behaviors. Contrarily, perceived quality was not a significant predictor, suggesting that in saturated markets where service standards are broadly similar, quality alone may be insufficient to drive repeat patronage. Notably, brand image emerged as the most influential determinant, underlining the importance of emotional connection, brand trust, and symbolic value in fostering loyal consumer relationships. These findings contribute to the evolving discourse on experiential consumption and social influence, offering actionable insights for coffee shop owners and marketers to cultivate deeper brand loyalty through social engagement, emotional resonance, and differentiated brand identity.