There are
2,733 mi
from Gaithersburg, MD to Tacoma, WA
That's the driving distance. It would take 2 days to go from Gaithersburg, Maryland to Tacoma, Washington.
The flight distance (direct flight from Gaithersburg, MD to Tacoma, WA) is 2,312.13 mi.
2,733 mi = 4,398.45 kms