The Salinas Valley is conveniently located on the California Central Coast along Highway 101 between San Jose (to the north) and San Luis Obispo (to the south). These are the closest commercial airports:

Monterey Peninsula Airport – MRY (approx. 15 miles from Salinas)
http://www.montereyairport.com

San Jose International Airport – SJC (approx. 60 miles from Salinas)
http://www.sjc.org

San Francisco International Airport – SFO (approx. 90 miles from Salinas)
http://www.flysfo.com