You may want to take the train instead. Otherwise, leave early. That's going to be a traffic nightmare. First the 5/805, then the El Toro, then "Orange Crush", then LA traffic.
Go the back way up I-15. It's only 10 minutes longer than if there was NO TRAFFIC AT ALL by way of LA. Should be able to do it in 2.5 hours as opposed to well over 3 hours through LA with traffic