There are
2,945 mi
from Rancho Cucamonga, CA to Watertown, MA
That's the driving distance. It would take 2 days 4 hours to go from Rancho Cucamonga, California to Watertown, Massachusetts.
The flight distance (direct flight from Rancho Cucamonga, CA to Watertown, MA) is 2,549.64 mi.
2,945 mi = 3.22 kms