Students from Asian countries form the largest group of mobile international students in Western anglophone countries. Despite research on the mobility experiences of international students to anglophone and non-anglophone countries, there are limited cross-comparative, mixed-method studies exploring the experiences of host language acquisition and usage and how these impact on academic performance and shapes social connectedness. This study contributes further understanding by exploring language acquisition experiences of international university students in Taiwan and Australia, where the language of instruction is not their native language. In the two universities studied, usage levels (general usage, speaking, reading, listening and writing) differed and depended on situational and contextual needs. Those studying in Australia consistently reported higher mean scores of host language usage across three of the five components: listening, reading and writing. Written communication was perceived to be a challenge for both groups during interviews. Overall, students preferred face-to-face classroom learning and highly valued peer support. Information communication and technology use was common in supporting vocabulary and pronunciation. We discuss how the findings of our study inform the types of academic learning support needed, and how these differed, depending on the host language, and student background.