There are
401 mi
from Gaithersburg, MD to Warwick, RI
That's the driving distance. It would take 8 hours 23 mins to go from Gaithersburg, Maryland to Warwick, Rhode Island.
The flight distance (direct flight from Gaithersburg, MD to Warwick, RI) is 351.74 mi.
401 mi = 645.26 kms