A headliner ventilation system that includes a headliner air duct positioned within the headliner along with an integrated pillar air duct for delivering air from a source, such as a heater and/or air conditioner, to the headliner air duct. The pillar air duct is integrally formed with the headliner air duct by use of a flexible hinge portion that allows the pillar air duct to be selectively positioned between a compact shipping state for easy storage and transport of the headliner and an extended state for easy installation into the vehicle. Because the pillar air duct is integrated with the headliner air duct, an adequate seal is ensured between the headliner air duct and the pillar air duct. In addition, less time and inventory are required, thereby reducing labor and expenses.