There are
2,810 mi
from Gaithersburg, MD to Newark, CA
That's the driving distance. It would take 2 days 1 hour to go from Gaithersburg, Maryland to Newark, California.
The flight distance (direct flight from Gaithersburg, MD to Newark, CA) is 2,407.69 mi.
2,810 mi = 4,521.65 kms