The aim of this study was to discuss benefits and challenges of flipped learning in teaching English as a foreign or second language through a systematic review. Prior to conducting this systematic review, 78 studies published in journals that are indexed in Web of Science (WOS), ERIC, ScienceDirect, SCOPUS, IGI Global, and Wiley Online Library databases were selected in accordance with a set of inclusion and exclusion criteria. As a result of the coding process, themes and sub-themes emerged based on the content analysis. The findings reveal that there is an increase in the publications on the implementation of flipped learning in teaching English as a foreign or second language. It is also seen that the majority of the studies about the implementation of flipped language learning includes university students as participants. One of the most reported benefits of the use of flipped learning in this field is that it has positive effects on enhancing students' English language skills such as writing and speaking. In some of the reviewed studies, however, some issues like access to the Internet and workload for both students and teachers are among the most expressed challenges.