There are
2,740 mi
from Gaithersburg, MD to Paso Robles, CA
That's the driving distance. It would take 2 days 1 hour to go from Gaithersburg, Maryland to Paso Robles, California.
The flight distance (direct flight from Gaithersburg, MD to Paso Robles, CA) is 2,377.14 mi.
2,740 mi = 4,409.27 kms