There are
1,975 mi
from Gaithersburg, MD to Evanston, WY
That's the driving distance. It would take 1 day 10 hours to go from Gaithersburg, Maryland to Evanston, Wyoming.
The flight distance (direct flight from Gaithersburg, MD to Evanston, WY) is 1,776.37 mi.
1,975 mi = 3,177.71 kms