In a small bowl, combine warm water, yeast, and sugar. Stir gently and let sit for 5-10 minutes until the mixture is foamy.
In a large mixing bowl, whisk together the flour and salt.
Pour the yeast mixture and melted butter into the flour mixture. Stir with a wooden spoon until a dough forms.
Turn the dough onto a lightly floured surface and knead for about 8-10 minutes until smooth and elastic.
Place the dough in a greased bowl, cover with a clean kitchen towel or plastic wrap, and let it rise in a warm place for about 1 hour or until doubled in size.
Punch down the dough to release the air. Shape it into a loaf and place it into a greased 9×5-inch loaf pan.
Cover the loaf pan with a towel and let the dough rise again for 30-40 minutes until it has risen about 1 inch above the pan.
Preheat the oven to 350°F (175°C).
Bake the bread for 25-30 minutes until the top is golden brown and the loaf sounds hollow when tapped.
Remove the bread from the oven and cool in the pan for 10 minutes. Then transfer to a wire rack to cool completely before slicing.