Due to the Covid-19 pandemic for the past few years, educational systems worldwide have been affected, causing closure in many educational institutions. The new condition forces teachers to make the transition of the way they teach from onsite to online teaching. The current study used the descriptive method to examine online teachers’ perceptions towards online teaching at a center of foreign languages in Vietnam. The results revealed that teachers showed a more positive perception towards online teaching although many typical problems in online teaching were presented and the effectiveness of online teaching was compared with traditional classroom teaching. Online teaching is highly likely to stay and will continue to excel. The transition from the traditional face-to-face classrooms to online teaching can be successfully achieved and quality can be ensured if challenges and ways for improving online learning can be closely examined.