There are
2,003 mi
from Temecula, CA to Romeoville, IL
That's the driving distance. It would take 1 day 11 hours to go from Temecula, California to Romeoville, Illinois.
The flight distance (direct flight from Temecula, CA to Romeoville, IL) is 1,678.53 mi.
2,003 mi = 3.22 kms