There are
1,167 mi
from Thornton, CO to Oroville, CA
That's the driving distance. It would take 20 hours 3 mins to go from Thornton, Colorado to Oroville, California.
The flight distance (direct flight from Thornton, CO to Oroville, CA) is 880.80 mi.
1,167 mi = 1.61 kms