There are
888 mi
from Tallahassee, FL to Harker Heights, TX
That's the driving distance. It would take 16 hours 29 mins to go from Tallahassee, Florida to Harker Heights, Texas.
The flight distance (direct flight from Tallahassee, FL to Harker Heights, TX) is 795.11 mi.
888 mi = 1,429.74 kms