Miles between Napa, CA and Boulder, CO

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

That's the driving distance. It would take 20 hours 54 mins to go from Napa, California to Boulder, Colorado.

The flight distance (direct flight from Napa, CA to Boulder, CO) is 918.45 mi.

1,218 mi = 1.61 kms