There are three major airports that might be of interest to you. LAX would be the furthest to Riverside at 65 miles, Ontario International Airport would be the closest at about 23 miles and then there is also John Wayne airport in Orange County (SNA) at around 44 miles. Also, there is Palm Springs airport ( a nice vintage airport... very classy place) at 59 miles.
358.1 Miles
The driving distance from LAX to Riverside, CA is 67 miles.
The driving distance from Riverside, California to Las Vegas, Nevada is 238 miles.
The driving distance is about 35 miles on the I-880 S.
The driving distance from Los Angeles International Airport to Orange, California is 40 miles.
440 miles on the I-5 South.
The total driving distance from Santa Ana, CA to Riverside, CA is 38 miles or 61 kilometers.
Driving distance is 118 miles (190 kilometers) over a 2-hour drive.
The driving distance from La Jolla, California to San Diego International Airport is 11 miles.
It is 72.6 miles according to Google Maps.
The shortest driving distance is 184 miles.
The driving distance from Riverside, California to Phoenix, Arizona is 320 miles via I-10 East per MapQuest. The driving time per MapQuest is 4 hours and 57 minutes.