There are
2,731 mi
from Tacoma, WA to Gaithersburg, MD
That's the driving distance. It would take 2 days to go from Tacoma, Washington to Gaithersburg, Maryland.
The flight distance (direct flight from Tacoma, WA to Gaithersburg, MD) is 2,312.13 mi.
2,731 mi = 3.22 kms