Digitalization transformation has been allowing airlines to vastly increase their productivity and profitability, and pioneer airlines have demonstrated a strong interest in applying digitalization to their booking system, membership management, and business operations. It is then necessary to analyze how those technologies can benefit budget airlines and how they can be better facilitated to enhance the competitiveness of the airlines. This paper studies the application of digitalization transformation adopted by budget airline AirAsia and how it influences and impacts its performance financially and operationally. The analysis was conducted to understand how AirAsia has done to transform its business into digitalization, including the aspects of both customers perspectives and internal operations and its corresponding performance based on those techniques. The result shows that digitalization is necessary and vital to enhancing its profitability, competitiveness, and innovation, and we propose that AirAsia could further utilize digitalization by enhancing the ticketing and booking system, customer experience, and working process.