Miles between Thornton, CO and Napa, CA

There are
1,218 mi
from Thornton, CO to Napa, CA

That's the driving distance. It would take 20 hours 48 mins to go from Thornton, Colorado to Napa, California.

The flight distance (direct flight from Thornton, CO to Napa, CA) is 934.01 mi.

1,218 mi = 1.61 kms