To "restart" the Southwest Airlines app in 2026 to resolve glitches or refresh your boarding pass, you should perform a force-close and relaunch. On an iPhone (iOS), swipe up from the bottom of the screen (or double-click the home button) to view the App Switcher, then swipe the Southwest app card up and off the screen to close it completely. On Android, tap the "Recent Apps" button and swipe the app away. Once closed, tap the app icon to reopen it. If problems persist, Southwest's official 2026 troubleshooting guide recommends logging out and back in, or "clearing the cache" in your phone's settings. In extreme cases, uninstalling and reinstalling the app ensures you have the latest version (v11.2+) which is required for 2026 features like Live Chat and real-time "Day of Travel" push notifications.