Tourism is increasingly recognized as a powerful tool for sustainability education, offering experiential learning opportunities that can shape environmental awareness and pro-sustainability behaviour. This research investigates how tourism experiences—such as ecotourism, cultural immersion, heritage tours, and community-based tourism—can become platforms for sustainability education. Using a mixed-method approach including literature review, 32 stakeholder interviews, and surveys of 450 tourists in India, Spain, and Thailand, the study examines how knowledge transfer, emotional engagement, and participatory activities influence tourist attitudes and post-travel behaviour. The findings show that hands-on experiences, interpretive guides, and community interactions significantly enhance sustainability learning, yet gaps exist in destination design, interpretive content, and institutional support. The study concludes with recommendations for integrating structured sustainability curricula, digital tools, and collaborative knowledge platforms into tourism experiences.