The FlyAway Bus has regularly scheduled non-stop trips to LAX from a variety of locations around Los Angeles.

http://www.lawa.org/FlyAway/Default.aspx

Buses go to the following locations:

• Van Nuys (San Fernando Valley)
• Union Station (Downtown Los Angeles)
• Westwood (West Los Angeles/UCLA)
• Santa Monica (1875 Main Street, just north of Pico Blvd.)
• Hollywood (6244 Hollywood Blvd, at Argyle)