There are
2,575 mi
from Rancho Cucamonga, CA to Gaithersburg, MD
That's the driving distance. It would take 1 day 21 hours to go from Rancho Cucamonga, California to Gaithersburg, Maryland.
The flight distance (direct flight from Rancho Cucamonga, CA to Gaithersburg, MD) is 2,247.93 mi.
2,575 mi = 4,143.63 kms