Miles between Gaithersburg, MD and San Marcos, CA

There are
2,627 mi
from Gaithersburg, MD to San Marcos, CA

That's the driving distance. It would take 1 day 23 hours to go from Gaithersburg, Maryland to San Marcos, California.

The flight distance (direct flight from Gaithersburg, MD to San Marcos, CA) is 2,249.50 mi.

2,627 mi = 4,228.44 kms