There are
1,292 mi
from Garland, TX to Manassas, VA
That's the driving distance. It would take 23 hours 14 mins to go from Garland, Texas to Manassas, Virginia.
The flight distance (direct flight from Garland, TX to Manassas, VA) is 1,144.04 mi.
1,292 mi = 2,079.69 kms