This study examines the relationship between domestic migration, economic growth, and transportation congestion in the National Capital Region (NCR) of the Philippines from the year 2012 to 2018. It utilizes a quantitative correlational research design which analyzes secondary data through an Ordinary Least Squares (OLS) regression model. The methodology involves the operationalization of Transport Congestion Index (TCI) based on vehicle density, accident rates, and Annual Average Daily Traffic. Results have indicated that Cumulative Domestic Migration and Regional GDP growth significantly increase transportation congestion, while population growth rate shows a negative relationship with congestion levels. The findings suggest that infrastructure development must address cumulative structural demand rather than just immediate population increases.