Previous studies on blended learning (BL) have explored students' satisfaction, perception, and motivation. However, there remains a notable gap in the literature concerning the impact of group collaboration on students' learning experiences within blended learning environments. Using a qualitative approach, this study explores what 30 Thai English as a foreign language (EFL) vocational students think about their blended learning environment and how working in groups improves their learning. Findings from the interviews revealed that group collaboration is crucial for communication, understanding the topic, completing tasks, and building relationships and trust among students. Specifically, the research highlights how collaborative efforts foster greater student engagement, accountability, and a sense of community within blended learning environments. It also contributes significantly to the existing body of knowledge, underscoring the essential nature of group collaboration within BL settings. The findings hold valuable implications for teachers, curriculum developers, and policymakers, suggesting avenues for leveraging blended learning and group collaboration to optimize language learning outcomes and enrich the overall educational experience for students.