Miles between Thornton, CO and Tomball, TX

There are
994 mi
from Thornton, CO to Tomball, TX

That's the driving distance. It would take 18 hours 17 mins to go from Thornton, Colorado to Tomball, Texas.

The flight distance (direct flight from Thornton, CO to Tomball, TX) is 856.96 mi.

994 mi = 1,599.73 kms