Preheat your oven to 400 degrees Fahrenheit (200 degrees Celsius).
Line a baking sheet with parchment paper.
In a large mixing bowl, combine the flour, sugar, baking soda, and salt.
Whisk together until well mixed.
Make a well in the center of the dry mixture.
Pour in most of the buttermilk, leaving a small portion aside.
Using a wooden spoon or your hands, gently mix the dough.
Add the remaining buttermilk if needed to bring the dough together.
Turn the dough out onto a floured surface and lightly knead until it just comes together.
Form into a round loaf and place it on the prepared baking sheet.
Cut a cross on the top of the loaf with a sharp knife.
Bake in the preheated oven for 30-35 minutes until the bread is golden brown.