Interstate 805 is a three-digit interstate route in southern California. I-805, also known as the Jacob Dekema Freeway or simply, the 805, serves the San Diego metropolitan area and acts as an alternate loop route of Interstate 5. The northern terminus is just north of the San Diego city limits not far from Miramar Naval Air Station ; the southern terminus rejoins I-5 just north of the town of San Ysidro north of the U.S.-Mexico border.

Major interchanges

• Interstate 5
• California State Highway 52
• California State Highway 163
• Interstate 8
• California State Highway 15
• California State Highway 94
• California State Highway 54
• California State Highway 905 (Future Interstate 905 )
• Interstate 5

Major cities and suburbs

• San Diego
• National City
• Chula Vista
• San Ysidro