There are
1,177 mi
from Thornton, CO to Pharr, TX
That's the driving distance. It would take 21 hours 5 mins to go from Thornton, Colorado to Pharr, Texas.
The flight distance (direct flight from Thornton, CO to Pharr, TX) is 1,022.45 mi.
1,177 mi = 1,894.24 kms