There are
2,502 mi
from Gallatin, TN to Eureka, CA
That's the driving distance. It would take 1 day 20 hours to go from Gallatin, Tennessee to Eureka, California.
The flight distance (direct flight from Gallatin, TN to Eureka, CA) is 2,043.52 mi.
2,502 mi = 4,026.33 kms