This present study aims to investigate the benefits of international teaching internship named ‘Sea-Teacher’ program on Indonesian pre service English teachers’ personal, professional and global-mindedness development. There were 8 participants from Sea-Teacher program consisted of 4 males and 4 females participated in in-depth semi-structured interview. The researcher found out that there are three personal benefits of international internship, namely self-dependent, coping mechanism and time management; five professional benefits of international teaching internship, specifically confidence in speaking, teaching skills and ideas, new world views on education and culture, career goals and new opportunity; and the benefits of the development of global-mindedness., those are understanding different culture, strengthening global-networking and promoting respect.