There are
1,079 mi
from Thornton, CO to Oxnard, CA
That's the driving distance. It would take 18 hours 59 mins to go from Thornton, Colorado to Oxnard, California.
The flight distance (direct flight from Thornton, CO to Oxnard, CA) is 874.57 mi.
1,079 mi = 1.61 kms