There are
1,982 mi
from St Charles, IL to Temecula, CA
That's the driving distance. It would take 1 day 10 hours to go from St Charles, Illinois to Temecula, California.
The flight distance (direct flight from St Charles, IL to Temecula, CA) is 1,670.70 mi.
1,982 mi = 3,190.29 kms