The aim of this study was to examine the learning losses experienced during the Covid-19 pandemic based on teachers’ opinions. For this purpose, a case study, one of the qualitative research methods, was carried out. Opinions of 35 teachers working at different school levels were gathered. The subjects were interviewed using a semi-structured interview form. The interviews were conducted online due to the restrictions of Covid-19. The data were measured by content analysis, and it was indicated that distance education was less effective. It was also revealed that there are some reasons for learning loss stemming from family, students, teachers, educational system and school administrators. The teachers reported that students generally suffered from learning losses in all courses. The teachers emphasized that Web 2.0 tools should be used, internet access should be provided, equipment support should be provided, infrastructure problems should be eliminated, fun activities should be added and materials should be used in order to prevent learning losses in the distance education process. Finally, the teachers suggested that extra courses should be given, summer recovery programs should be offered, the subjects should be reviewed, the lesson periods should be longer, and lessons should be taught effectively in order to eliminate learning losses.