https://support.xilinx.com/s/question/0D54U00008ahDM8SAM/speak-sia-what-is-the-24-hour-hotline-for-singaporeair-helpdeskquick-support?language=en_US What is the 24 hour hotline for SingaporeAir? If you need assistance with your Singapore Airlines booking, have questions about your flight, or require any other support, you can easily reach their customer service team at +1=833=460=1838.. Singapore Airlines offers a 24-hour hotline to ensure you get the help you need at any time of the day.