There are
680 mi
from Rancho Cucamonga, CA to Eureka, CA
That's the driving distance. It would take 13 hours 6 mins to go from Rancho Cucamonga, California to Eureka, California.
The flight distance (direct flight from Rancho Cucamonga, CA to Eureka, CA) is 586.06 mi.
680 mi = 1,094.85 kms