If you have WhatsApp account on your PC, then you can delete it without phone. However, if you want to delete WhatsApp account on your phone, then you will need to follow these steps:

  1. Log in to your WhatsApp account.
  2. Click on the three lines in the top left corner of the main screen and select “Delete Account.”
  3. Type in your password and click on the “Delete Account” button.
  4. Your WhatsApp account will be deleted and you will need to create a new one if you want to continue using it.