There are
1,005 mi
from Harlingen, TX to Grain Valley, MO
That's the driving distance. It would take 19 hours 1 min to go from Harlingen, Texas to Grain Valley, Missouri.
The flight distance (direct flight from Harlingen, TX to Grain Valley, MO) is 908.95 mi.
1,005 mi = 1,617.90 kms