There are
1,594 mi
from Harlingen, TX to Norwalk, CA
That's the driving distance. It would take 1 day 3 hours to go from Harlingen, Texas to Norwalk, California.
The flight distance (direct flight from Harlingen, TX to Norwalk, CA) is 1,327.40 mi.
1,594 mi = 2,564.63 kms