You can begin checking in for your Singapore Airlines flight as early as 48 hours before the scheduled departure time. This early check-in window applies to online and mobile check-in, which is highly recommended for convenience and time-saving purposes. Through the airline’s website or mobile app, you can complete your check-in process by entering your booking details, selecting seats, and obtaining your boarding pass digitally. Online and mobile check-in remain available up to 90 minutes before the flight’s departure, allowing passengers to check in even at the last minute if needed. If you prefer to check in at the airport, counters usually open three hours prior to the flight and close approximately 40 minutes before takeoff. Because of these timings, it is advisable to arrive at the airport at least two and a half hours early if you need to check bags, go through security, and complete other pre-flight procedures. Passengers traveling only with carry-on luggage may find arriving an hour and a half before departure sufficient, though allowing extra time is always safer to avoid stress or delays. Singapore Airlines also offers self-service kiosks at many airports worldwide. These kiosks provide an efficient way to check in, select or change seats, print boarding passes, and generate baggage tags without waiting in long lines. The kiosks typically operate within the same timeframe as airport counters and are a good alternative for passengers who prefer not to check in online. Some airports provide early check-in services for Singapore Airlines passengers, such as at Changi Airport’s Jewel complex. These facilities enable you to check in and drop off your baggage up to 24 hours before your flight, which is especially convenient for travelers who want to avoid crowds on the day of departure or who have early morning flights. Keep in mind that check-in times and counter operating hours may vary depending on the departure airport and your destination. It’s important to check the specific guidelines for your route to ensure you comply with the deadlines and avoid missing your flight. Arriving early and completing check-in promptly also gives you enough time to pass through security screening and immigration if applicable. Boarding gates usually close 20 to 30 minutes before the scheduled departure time, so being at the gate well in advance is crucial. Failure to check in or drop off luggage before the cutoff time may result in denied boarding, no matter the reason. To summarize, Singapore Airlines offers flexible check-in options starting 48 hours before the flight through online and mobile platforms, up to 90 minutes before departure. Airport counters open about three hours before the flight and close around 40 minutes before takeoff, with self-service kiosks available for added convenience. Early check-in facilities at select airports add further flexibility. Planning ahead and arriving early helps ensure a smooth experience, letting you start your trip relaxed and prepared.