Airport John Murtha Johnstown-Cambria County is located in United States near the city of Johnstown. The international codes of John Murtha Johnstown-Cambria County airport are ICAO: KJST and IATA: JST. John Murtha Johnstown-Cambria County is located at latitude 40.3161 and longitude -78.8339. The elevation above sea level is 2284ft (696m). Local timezone at the airport is UTC/GMT -5:00 hours.