Miles between Ontario, CA and Watertown, MA

There are
2,951 mi
from Ontario, CA to Watertown, MA

That's the driving distance. It would take 2 days 4 hours to go from Ontario, California to Watertown, Massachusetts.

The flight distance (direct flight from Ontario, CA to Watertown, MA) is 2,553.95 mi.

2,951 mi = 3.22 kms