Preheat the oven to 350 degrees Fahrenheit. Grease the loaf pan and lay a piece of parchment paper the long way across the pan. Use a piece long enough so the ends come up the sides of the pan and can be used as a sling to remove the loaf from the pan.
In a medium bowl, combine the flour, baking soda and salt. Whisk to combine and set aside.
In another bowl, combine the buttermilk, lemon zest and lemon juice. Set aside.
Add the butter and sugar to the bowl of a stand mixer. Using the paddle attachment, beat until light and fluffy, around 3 minutes. Scrape down the sides of the bowl once or twice while mixing.
Add a fourth of the flour mixture to the butter mixture and mix to combine. Next, add a third of the buttermilk mixture and mix to combine. Repeat with the next quarter of the flour mixture and third of the buttermilk mixture until all ingredients have been added. Remove bowl from stand mixer and beat by hand with a spatula to make sure batter is well combined.
Take the blueberries and place in a bowl. Add a pinch of flour and toss to coat the blueberries. Repeat as necessary until blueberries are fully coated.
Fold the blueberries into the batter.
Divide the batter evenly between the two prepared loaf pans
Bake the loaves for 55 minutes or until a toothpick comes out clean.
Let the loaves cool in the tin for ten minutes. After ten minutes, lift the loaves out of the pan using the parchment slings and let cool on a cooling rack for around an hour.