There are
2,152 mi
from Harlingen, TX to Shasta Lake, CA
That's the driving distance. It would take 1 day 13 hours to go from Harlingen, Texas to Shasta Lake, California.
The flight distance (direct flight from Harlingen, TX to Shasta Lake, CA) is 1,729.68 mi.
2,152 mi = 3,462.54 kms