There are
2,261 mi
from Mt Prospect, IL to Eureka, CA
That's the driving distance. It would take 1 day 15 hours to go from Mt Prospect, Illinois to Eureka, California.
The flight distance (direct flight from Mt Prospect, IL to Eureka, CA) is 1,864.51 mi.
2,261 mi = 3,638.22 kms