There are
2,247 mi
from Gaithersburg, MD to Missoula, MT
That's the driving distance. It would take 1 day 15 hours to go from Gaithersburg, Maryland to Missoula, Montana.
The flight distance (direct flight from Gaithersburg, MD to Missoula, MT) is 1,915.83 mi.
2,247 mi = 3,616.01 kms