Miles between Union City, CA and Thornton, CO

There are
1,259 mi
from Union City, CA to Thornton, CO

That's the driving distance. It would take 21 hours 36 mins to go from Union City, California to Thornton, Colorado.

The flight distance (direct flight from Union City, CA to Thornton, CO) is 932.13 mi.

1,259 mi = 2,026.06 kms