Riverside Municipal Airport, is four miles southwest of downtown Riverside, the county seat of Riverside County, California, United States. Scheduled flights to Laughlin/Bullhead International Airport on Western Express Air ended when that airline ceased operations at the end of May 2007.Runway 9/27 was paved about 1956 and Bonanza Air Lines appeared soon after; until 1969 it and successor Air West flew DC-3s and Fairchild F-27s to LAX, Las Vegas, Palm Springs and beyond.