There are
2,588 mi
from Johnson City, TN to Hercules, CA
That's the driving distance. It would take 1 day 21 hours to go from Johnson City, Tennessee to Hercules, California.
The flight distance (direct flight from Johnson City, TN to Hercules, CA) is 2,185.09 mi.
2,588 mi = 4,165.20 kms