No, you generally do not need to submit an SG Arrival Card (SGAC) if you are strictly transiting through Singapore Changi Airport and do not intend to clear immigration. If your bags are checked through to your final destination and you remain within the transit area of the airport, you are exempt. However, if you plan to enter Singapore—even for a few hours to see the "Jewel" or stay overnight at a hotel outside the transit zone—you must submit the digital SG Arrival Card within three days of your arrival. In 2026, the process is entirely digital via the MyICA app or the official ICA website. It is also worth noting that if you are using the "96-hour Visa Free Transit Facility" (VFTF) to enter the city during a long layover, the Arrival Card is mandatory as part of the immigration clearance process.