Change heroku region after creation

Question

Thought this could work, but it doesn't:

 heroku appname --region=eu

This works, but I already have an existing app, so this does not make sense for me:

heroku create --region eu

Or for an addon:

heroku addons:list --region=eu

Answer 1

There is NO native ability just to switch region, but still there is a way how to do this.

Create fork of the app in a region you need.
For example, you have app in US region and you want to migrate it to EU:

• Run this command to create a new app that will be a copy of existing:

  heroku fork --from sourceapp --to targetapp --region eu
  

• After check if it is working, check (and copy-paste if needed) settings, permissions, addons, etc. They might copy too, but it is better to check.
• Rename sourceapp to something like sourceapp_old.
• Rename targetapp to sourceapp.

NOTE: But still this method has few cons:

• it doesn't migrate database (but there is a method how to handle that)
• there can be issues with DNS and SSL
• if the web server is live - you'll need to use maintenance mode

Anyhow, I'd recommend to read official Heroku documentation before doing so risky actions like this.