There are
1,585 mi
from Topeka, KS to San Marcos, CA
That's the driving distance. It would take 1 day 3 hours to go from Topeka, Kansas to San Marcos, California.
The flight distance (direct flight from Topeka, KS to San Marcos, CA) is 1,263.04 mi.
1,585 mi = 1.61 kms