Difficult intubation is one of the main challenges in anaesthesiology . There are many clinical criteria that were  introduced with regard to evaluation of the patient’s airway before induction of anaesthesia, including Mallampati classification, mouth-opening, thyromental distance, neck extension, jaw protrusion, upper-lip bite test etc. Prospective Observational study conducted with 84 patients posted for elective surgical procedure. Airway was examined by both clinical and ultrasound. This study found that the correlation between the ultrasonographic parameters and Cormack-Lehane grade were weak or very weak, and can be assumed to have limited clinical significance.