There are
2,576 mi
from San Bernardino, CA to Gaithersburg, MD
That's the driving distance. It would take 1 day 22 hours to go from San Bernardino, California to Gaithersburg, Maryland.
The flight distance (direct flight from San Bernardino, CA to Gaithersburg, MD) is 2,231.68 mi.
2,576 mi = 3.22 kms