A map has the scale of 2 inches = 250 miles. The distance from Dallas to Spring is 8 inches on the map. How many miles is it from Dallas to Spring?

If 2 inches on the map represents 250 miles, then 1 inch represents 250/2 = <<250/2=125>>125 miles.

So 8 inches on the map represents 8 x 125 = <<8*125=1000>>1000 miles. Answer: \boxed{1000}.