There are
2,086 mi
from Vallejo, CA to Romeoville, IL
That's the driving distance. It would take 1 day 11 hours to go from Vallejo, California to Romeoville, Illinois.
The flight distance (direct flight from Vallejo, CA to Romeoville, IL) is 1,816.15 mi.
2,086 mi = 3.22 kms