Access Snapchat using a browser, and not via the app. These steps will quickly delete your Snapchat account:
Visit Settings on Snapchat.
Scroll down to Help.
In the search box, type or Delete.
To delete your account, click on the' Log In' button.
Enter your password and username under Delete Account. Click ‘Continue' to continue.
For 30 days, your account has been deactivated. After this time, you will need to stop logging into Snapchat.