There are
1,345 mi
from Greeley, CO to Eureka, CA
That's the driving distance. It would take 23 hours 47 mins to go from Greeley, Colorado to Eureka, California.
The flight distance (direct flight from Greeley, CO to Eureka, CA) is 1,018.67 mi.
1,345 mi = 2,164.90 kms