In the rapidly evolving airline industry, characterized by intense competition and shifting consumer expectations, understanding and predicting consumer behavior has emerged as a strategic imperative. This paper delves into the significance of leveraging Key Performance Indicators (KPIs) for gaining insights into consumer behavior, thereby informing and refining airline marketing and operational strategies. Through a mixed-methods approach, incorporating both qualitative and quantitative data collection and analysis, this study identifies and examines critical KPIs including Customer Lifetime Value (CLV), Customer Acquisition Cost (CAC), Net Promoter Score (NPS), Booking Lead Time, and Digital Engagement Metrics. The findings reveal that personalization, digital engagement, sustainability focus, and loyalty program optimization are key areas influenced by consumer behavior insights, driving customer satisfaction and loyalty. Theoretical contributions extend to integrating behavioral economics with consumer choice theories, advancing service-dominant logic, and enriching customer relationship management models. Practically, the study offers actionable recommendations for airlines, emphasizing the utility of advanced data analytics, the optimization of digital platforms, the innovation of loyalty programs, and the incorporation of sustainable practices. Future research directions suggest exploring the impact of emerging technologies, social media, sustainability, and cross-cultural variations on consumer behavior. This research underscores the strategic value of a comprehensive understanding of consumer behavior in maintaining competitive advantage and fostering customer loyalty in the airline industry.