Singapore Airlines doesn't have a physical ticket office in Austin, TX they operate through their main Singapore Airlines website for bookings/support or partner United Airlines (Star Alliance), but you can call their general customer service line at +1-866-829-1086 or find flight info on the AUS airport page, using online tools for bookings from Austin-Bergstrom Intl. Airport (AUS). Jauntlet.comhttps://jauntlet.com/