There are
2,004 mi
from Vacaville, CA to Harlingen, TX
That's the driving distance. It would take 1 day 10 hours to go from Vacaville, California to Harlingen, Texas.
The flight distance (direct flight from Vacaville, CA to Harlingen, TX) is 1,641.66 mi.
2,004 mi = 3.22 kms