There are
2,691 mi
from Gaithersburg, MD to Poway, CA
That's the driving distance. It would take 1 day 23 hours to go from Gaithersburg, Maryland to Poway, California.
The flight distance (direct flight from Gaithersburg, MD to Poway, CA) is 2,247.29 mi.
2,691 mi = 4,330.86 kms