There are
2,809 mi
from Rockville, MD to Cornelius, OR
That's the driving distance. It would take 2 days 1 hour to go from Rockville, Maryland to Cornelius, Oregon.
The flight distance (direct flight from Rockville, MD to Cornelius, OR) is 2,354.64 mi.
2,809 mi = 4,520.41 kms