There are
1,400 mi
from Irving, TX to Niagara Falls, NY
That's the driving distance. It would take 1 day 1 hour to go from Irving, Texas to Niagara Falls, New York.
The flight distance (direct flight from Irving, TX to Niagara Falls, NY) is 1,202.79 mi.
1,400 mi = 1.61 kms