Yes, you can delete an Instagram account without logging in. To do so, follow these steps:

  1. Log in to your Instagram account.
  2. Click on the three lines in the top left corner of your screen (the one that says “Account Settings”).
  3. Scroll down and click on the “Delete Account” button.
  4. Enter your username and password into the “Delete Account” text field and click on the “delete” button.