There are
2,088 mi
from Harlingen, TX to Ukiah, CA
That's the driving distance. It would take 1 day 12 hours to go from Harlingen, Texas to Ukiah, California.
The flight distance (direct flight from Harlingen, TX to Ukiah, CA) is 1,723.86 mi.
2,088 mi = 3,360.48 kms