Deviated nasal septum is the most common cause of nasal obstruction and is one of the common problems encountered by otolaryngologists. Although there are different methods to surgically correct a deviated nasal septum which can give qualitative relief to the patient, less emphasis is put on the quantitative assessment of airway after a septal correction surgery. Institution based Case Control study was undertaken at Medical College and Hospital Kolkata between January 2019 to March 2020 to subjectively and objectively assess and compare the nasal airway status preoperatively and postoperatively in patients undergoing conventional and endoscopic septoplasty. A total of 250 patients were taken in this study and divided into two groups A and B. Group A consisted of patients undergoing Conventional Septoplasty (Control arm) and Group B consisted of patients undergoing Endoscopic Septoplasty (Case arm). Patients were followed up and the readings of NOSE score and PNIF value were recorded at the end of 6 weeks and 6 months (24 weeks). The Mean NOSE score post operatively at the end of 6 weeks was 36.32 in GROUP A (Control arm) and 33.08 in GROUP B (Case arm). t-Test revealed insignificant results with a p -value of 0.08. The mean NOSE score post operatively at the end of 6 months was 29.96 in GROUP A (Control arm) and 22.16 in GROUP B (Case arm). t-Test revealed significant results with a p -value of 0.00. Similarly, Mean PNIF value post operatively at the end of 6 weeks was 57.24 in GROUP A (Control arm) and 73.88 in GROUP B (Case arm). t-Test revealed significant results with p -value of 0.00. The mean PNIF value post-operatively at the end of 6 months was 59.44 in GROUP A (Control arm) and 80.08 in GROUP B (Case arm). t-Test revealed significant results with p -value of 0.00. Endoscopic Septoplasty is a very effective way to treat septal deviations especially with deviations based on the posterior aspect of the septum. It provides a superior edge in terms of nasal airway improvement as compared to conventional method of septoplasty.