Spelt flour is not a good substitute to replace gluten-free flours because it contains gluten. If that's not a concern, spelt flour can be a great substitute in general. I use it to make my Healthy Coffee Cake, Vegan Chocolate Loaf Cake, or Cranberry Orange Muffins. If you use Spelt flour to make these Vegan Pumpkin Muffins, be sure to let me know in the comments.