There are
560 mi
from Gaithersburg, MD to Seymour, IN
That's the driving distance. It would take 11 hours 11 mins to go from Gaithersburg, Maryland to Seymour, Indiana.
The flight distance (direct flight from Gaithersburg, MD to Seymour, IN) is 466.21 mi.
560 mi = 901.38 kms