There are
1,401 mi
from Diamond Bar, CA to Grapevine, TX
That's the driving distance. It would take 1 day to go from Diamond Bar, California to Grapevine, Texas.
The flight distance (direct flight from Diamond Bar, CA to Grapevine, TX) is 1,195.10 mi.
1,401 mi = 2,255.17 kms