Universal Health Coverage is central to ensuring equitable access to healthcare without financial hardship. Despite regional progress, Southeast Asian countries show disparities in UHC performance due to varying economic capacities and health system readiness. This study aimed to assess the Philippines’ UHC status relative to its Southeast Asian neighbors; and analyzing their relationships with economic indicators.To evaluate UHC in the Philippines and other Southeast Asian nations – To compare UHCSCI scores in the Philippines and other Southeast Asian nations – To assess the economic status and examine it alongside UHCSCI scoresThis cross-sectional ecological study utilized WHO and World Bank data from eleven Southeast Asian countries. Descriptive and correlational analyses examined patterns between UHCSCI scores and economic parameters.Among UHCSCI scores, the Philippines fell within a middle-tier performance among other countries, performing excellently in antenatal care but lagging in multiple sub-indices. The GDP PPP per capita showed logarithmic relationships with UHCSCI, suggesting diminishing returns in UHC beyond US$20,000. Conversely, health expenditure showed an inverse relationship with UHCSCI, suggesting efficiency, not total spending, drives better outcomes.Performance varied across Southeast Asia, with the Philippines' UHCSCI score falling midrange of regional performance. Areas of improvement include disease management, and having adequate health workforce. Analyses implied that economic growth contributes to better health coverage up to a certain threshold. Data also highlights that higher spending alone does not guarantee better outcomes, showing inverse relationship between health expenditure and UHCSCI. Instead, high-income countries demonstrated that efficient governance, resource distribution, and primary care systems drive improvements in service coverage, underscoring need for efficiency, accountability, and performance-based allocation.For the Philippines, these patterns emphasize the need to strengthen its healthcare system’s foundations. Lessons from high-performing countries suggest that integrating preventive care and having locally applicable interventions can improve efficiency and accessibility. Furthermore, UHC advancement requires intersectoral collaboration, recognizing that health is influenced by various determinants. Aligning fiscal and health policies through coordination with different departments can ensure that investments translate into measurable outcomes. Ultimately, sustained progress toward UHC in the Philippines depends not only on funding but also on strategic, data-driven governance and regional cooperation.