1. Start on Interstate 10 (I-10) in El Paso, Texas.
2. Follow I-10 west through New Mexico and Arizona until you reach the interchange with Interstate 40 (I-40) in Flagstaff, Arizona.
3. Take I-40 west through Arizona and California until you reach Barstow, California.
4. In Barstow, take Interstate 15 (I-15) south through the Cajon Pass and into Los Angeles.
The total distance of this route is approximately 1,180 miles. The drive time can vary depending on traffic and weather conditions, but it typically takes around 17-18 hours to complete.