There are
2,145 mi
from Mt Prospect, IL to Paso Robles, CA
That's the driving distance. It would take 1 day 13 hours to go from Mt Prospect, Illinois to Paso Robles, California.
The flight distance (direct flight from Mt Prospect, IL to Paso Robles, CA) is 1,805.88 mi.
2,145 mi = 3,451.33 kms