Singapore Airlines allows passengers to check in online starting 48 hours before the scheduled departure time of their flight. This early online check-in window provides travelers with ample time to select seats, add special requests, and obtain their boarding passes conveniently from home or on the go. Online check-in is available through the official Singapore Airlines website or via their mobile app, both of which offer a user-friendly interface to complete the process quickly. For those preferring to check in at the airport, Singapore Airlines’ check-in counters typically open 3 hours before departure for international flights and 2 hours before departure for domestic flights, although most Singapore Airlines flights are international. It’s recommended to arrive early at the airport, allowing enough time for baggage drop, security screening, and possible immigration checks. Passengers flying in premium cabins such as Business or First Class, or those holding elite frequent flyer status with KrisFlyer or partner programs, can access priority check-in counters, often opening at the same time but providing faster service. Singapore Airlines also provides self-service kiosks at many airports, allowing quick check-in and printing of boarding passes, usually available alongside staffed counters from 3 hours before flight time. Some passengers, such as those requiring special assistance, traveling with infants, or carrying excess baggage, might still need to use the traditional check-in counters. In summary, Singapore Airlines opens its online check-in 48 hours prior to departure, giving passengers plenty of time to prepare for their trip, while airport check-in counters open roughly 3 hours before takeoff for international flights. Early online check-in is highly recommended to secure preferred seats and reduce wait times at the airport, ensuring a smooth start to your journey with Singapore Airlines.