There are
2,500 mi
from Gaithersburg, MD to Pullman, WA
That's the driving distance. It would take 1 day 20 hours to go from Gaithersburg, Maryland to Pullman, Washington.
The flight distance (direct flight from Gaithersburg, MD to Pullman, WA) is 2,065.05 mi.
2,500 mi = 4,023.59 kms