The study aims to investigate the satisfaction of undergraduates from a university in Vietnam. Ninety-nine students participated in the study during the first term of the academic year 2021 - 2022. This study has the baseline from a cooperation between two universities in Thailand and Vietnam, of which a specially designed course was organized for Vietnamese students under the instruction and supervision of a Thai lecturer and a Vietnamese one. A questionnaire was utilized for data collection with two main parts (1) the participants’ basic information about their exposure to English, their cohorts, their ages, and so on, and (2) their satisfaction with a flipped classroom. The data analysis was conducted using frequency, percentages, standard deviation, and means. In the findings, the three most rated levels of satisfaction were found with the means of 4.01, 3.95, and 3.94 respectively for the usefulness of language learners’ experience in the learning process, the diversity of effective resourceful topics, and the benefits of having more discussions in the flipped classroom. Therefore, a flipped classroom can be regarded as an alternative that could be employed both in different contexts with activities off-campus and in the classroom. In that sense, a digital technology additional to traditional contexts might be able to transform old-fashioned instructional features besides the other classroom formats to better both group learning and the individual one.