There are
2,036 mi
from Harlingen, TX to Susanville, CA
That's the driving distance. It would take 1 day 13 hours to go from Harlingen, Texas to Susanville, California.
The flight distance (direct flight from Harlingen, TX to Susanville, CA) is 1,641.81 mi.
2,036 mi = 3,276.68 kms