The primary focus of youth physical activity assessment and promotion efforts has been on in-school physical education classes, and to a lesser extent, out-of-school structured exercise, sport, and play. A potential source of continuous moderate activity, active commuting to school by means of walking or by bicycle, has been largely ignored in surveys of physical activity. Therefore, a subanalysis was undertaken of an ongoing study of youth in the Philippines: The Cebu Longitudinal Health and Nutrition Survey. Adolescent participants (aged 14–16 years) responded to a simple questionnaire and wore a Caltrac accelerometer during waking hours over a 24-hour period during a regular school week. The purpose of the subanalysis was to compare objectively determined physical activity levels in youth stratified for self-reported commuting mode to school: 1) exclusively by walking, or WALKERS (males = 295, females = 300); and, 2) exclusively by motor vehicle transportation, or RIDERS (private, public or school; males = 157, females = 181). Independent t-tests were used to compare BMI, Caltrac-determined energy expenditure due to activity, and self-reported time watching television between the two habitual commuting modes. WALKERS had a significantly lower BMI than RIDERS (18.5 ± 2.4 vs. 18.9 ± 2.7 kg/m2, p = 0.01), expended more energy due to physical activity despite a lower BMI (353.2 ± 159.7 vs. 317.6 ± 160.1 kcals, p = 0.001), and reported watching less television (1.8 ± 1.2 vs. 2.1 ± 1.2 hours/day, p = 0.02). Although based on a cross-sectional design, the findings of this study provide preliminary stupport for increasing opportunities for safe, active commuting to school as a means of promoting healthful physical activity in youth. Supported in part by the Scientific Affairs Division of M&M Mars and CDC#U48/CCU409664.