There are
2,206 mi
from Mt Prospect, IL to Greenfield, CA
That's the driving distance. It would take 1 day 15 hours to go from Mt Prospect, Illinois to Greenfield, California.
The flight distance (direct flight from Mt Prospect, IL to Greenfield, CA) is 1,814.99 mi.
2,206 mi = 3,550.22 kms