Deploying a Flutter app to the App Store and Google Play involves several detailed steps. For iOS, the process starts with setting up an Apple Developer account, registering a unique bundle ID, and preparing the app's icons and launch screens. Developers must then configure the Xcode project settings, build the app using the command line, and upload it to App Store Connect for review. For Android, prerequisites include having a launcher icon and preparing app assets. Developers need to create a keystore if not already available, configure the signing in Gradle, and ensure the AndroidManifest.xml is properly set up. The app is then built into an APK file using the command line and uploaded to the Google Play Store. Both platforms require attention to guidelines and proper configuration to ensure a successful release.