Construction of the Pacific Air Depot began in 1935, and the main structures, including administrative buildings, barracks, warehouses and a hospital were completed on 18 April 1938.
In 1938 the base was renamed Sacramento Air Depot and underwent a major expansion as a repair and overhaul facility for P-38 and P-39 fighter planes.
In December 1941, soon after the attack on Pearl Harbor, P-40s as well as Martin B-26 Marauder and Boeing B-17 Flying Fortress bombers began arriving at the field to be armed and prepared for immediate shipment overseas.
A small contingent of F-111D and F-111F aircraft of the 431st Test and Evaluation Squadron, 57th Fighter Weapons Wing, Nellis AFB, Nevada was also detached to McClellan.
For the 12-month period ending April 10, 2004, the airport had 10,000 aircraft operations, an average of 27 per day: 40% military, 40% air taxi and 20% general aviation.