Miles between Diamond Bar, CA and San Marcos, CA

There are
86 mi
from Diamond Bar, CA to San Marcos, CA

That's the driving distance. It would take 1 hour 41 mins to go from Diamond Bar, California to San Marcos, California.

The flight distance (direct flight from Diamond Bar, CA to San Marcos, CA) is 71.52 mi.

86 mi = 138.32 kms