There are
2,655 mi
from Gaithersburg, MD to Susanville, CA
That's the driving distance. It would take 1 day 22 hours to go from Gaithersburg, Maryland to Susanville, California.
The flight distance (direct flight from Gaithersburg, MD to Susanville, CA) is 2,285.42 mi.
2,655 mi = 4,273.51 kms