There are
2,593 mi
from Gaithersburg, MD to Glendora, CA
That's the driving distance. It would take 1 day 22 hours to go from Gaithersburg, Maryland to Glendora, California.
The flight distance (direct flight from Gaithersburg, MD to Glendora, CA) is 2,261.74 mi.
2,593 mi = 4,172.34 kms