There are
2,586 mi
from Gaithersburg, MD to Norco, CA
That's the driving distance. It would take 1 day 22 hours to go from Gaithersburg, Maryland to Norco, California.
The flight distance (direct flight from Gaithersburg, MD to Norco, CA) is 2,249.91 mi.
2,586 mi = 4,161.48 kms