TL;DR: to delete all Heroku apps matching the <PATTERN>:

heroku apps | grep <PATTERN> | xargs -n1 -I {} /bin/bash -c 'heroku apps:destroy {} --confirm={}'

This article goes over how to delete multiple Heroku apps with the CLI.

Prerequisites

• Heroku CLI

List Apps

List all Heroku apps:

heroku apps

List all Heroku apps in team my-team:

heroku apps --team=my-team

List all Heroku apps matching the pattern my-app:

heroku apps | grep my-app

List all Heroku apps matching the pattern my-app and excluding production:

heroku apps | grep my-app | grep -v production

Delete Apps

Delete the first Heroku app matching the pattern my-app:

heroku apps | grep my-app | head -1 | xargs -n1 -I {} /bin/bash -c 'heroku apps:destroy {} --confirm={}'

Delete all Heroku apps matching the pattern my-app:

heroku apps | grep my-app | xargs -n1 -I {} /bin/bash -c 'heroku apps:destroy {} --confirm={}'