There are
284 mi
from San Marcos, CA to Lake Havasu City, AZ
That's the driving distance. It would take 5 hours 40 mins to go from San Marcos, California to Lake Havasu City, Arizona.
The flight distance (direct flight from San Marcos, CA to Lake Havasu City, AZ) is 187.69 mi.
284 mi = 457.33 kms