There are
769 mi
from Thornton, CO to Tahlequah, OK
That's the driving distance. It would take 13 hours 15 mins to go from Thornton, Colorado to Tahlequah, Oklahoma.
The flight distance (direct flight from Thornton, CO to Tahlequah, OK) is 609.42 mi.
769 mi = 1,236.79 kms