Abstract: This study examined the variables that contributed to project delays, including endogenous and exogenous factors, specifically the road infrastructure projects supervised by the Department of Public Works and Highways Isabela 4th District Engineering Office. It aimed to provide valuable insights for the creation of mitigation plans intended to reduce delays in road construction projects. The paper utilized a qualitative research methodology, collecting data from project managers, engineers, and inspectors through quantitative questionnaires. It employed rank correlation and severity indexes to analyze the data and identified 46 potential causes of delay for endogenous factors and 7 potential causes of delay for exogenous factors. The top 3 endogenous factors were (1) Insufficient laborers, (2) Shortage of equipment, and (3) Low labor productivity, and the top 2 exogenous factors were (1) Weather conditions and (2) Political Situation. The survey revealed a moderate level of agreement (51.07%) between the implementing office and contractors regarding endogenous factors. There were no correlation (57.14%) amongst the exogenous factors. The recommendations included developing comprehensive plans and schedules for both wet and dry seasons, ensuring adequate personnel, improving equipment management, enhancing worker productivity, conducting thorough surveys, and complying with all legal and regulatory requirements in restricted areas.