There are
2,628 mi
from Downey, CA to Martinsburg, WV
That's the driving distance. It would take 1 day 21 hours to go from Downey, California to Martinsburg, West Virginia.
The flight distance (direct flight from Downey, CA to Martinsburg, WV) is 2,238.91 mi.
2,628 mi = 4,230.10 kms