There are
630 mi
from Garland, TX to Florissant, MO
That's the driving distance. It would take 11 hours 49 mins to go from Garland, Texas to Florissant, Missouri.
The flight distance (direct flight from Garland, TX to Florissant, MO) is 538.21 mi.
630 mi = 1,013.96 kms