Sequel to the outright loss of academic calendars by public tertiary institutions in Nigeria arising from the Covid-19 global pandemic, the study aimed to examine the challenges faced by Nigerian public tertiary institutions students in an online learning environment after the pandemic. The study adopted a survey research design. Using a simple random sampling technique, a sample of 375 undergraduate students was drawn from the average population of 6,000 students from three academic faculties of Obafemi Awolowo University. Data were gathered through a structured online questionnaire which was administered to the respondents via email and WhatsApp. Data were analyzed with the use of descriptive statistics. The results of the study showed that the majority of the students of public higher institutions prefer physical contact sessions to online due to persistent frustration arising from poor network service, poor electricity supply, and high data subscription costs among other challenges confronting students in an online learning environment in Nigeria. The study recommends the provision of basic infrastructure for effective online learning as well as compliance with the minimum benchmark set by the National Universities Commission for the public universities in the country to avert future losses of the academic calendar.