There are
2,621 mi
from Gaithersburg, MD to Westminster, CA
That's the driving distance. It would take 1 day 22 hours to go from Gaithersburg, Maryland to Westminster, California.
The flight distance (direct flight from Gaithersburg, MD to Westminster, CA) is 2,278.21 mi.
2,621 mi = 4,217.89 kms