International Student Mobility Programs (ISMPs) have become increasingly popular among university students. This study explores the perceptions of undergraduate students from the English Education Study Program at a private university in Yogyakarta Indonesia who have participated in ISMPs, focusing on the advantages and challenges they experienced. Adopting a qualitative approach, data were collected through in-depth interviews with the participants. The findings reveal that ISMPs provide substantial benefits, including enhanced language proficiency, expanded professional and personal networks, cultural exchange, and self-development. However, participants also reported notable challenges, such as language barriers, differing cultural norms, unfamiliar study materials and assignments, and time zone adjustments. These insights offer valuable guidance for prospective ISMP participants, enabling them to anticipate and address potential challenges while maximizing the program's benefits. Moreover, the findings underscore the need for educational institutions and policymakers to develop targeted strategies to optimize the ISMP experience, ensuring students achieve meaningful academic and personal growth through these programs. [Note: The page range (164-177) shown on the PDF is incorrect. The correct page range is 163-176.]