Singapore Airlines allows passengers to check in online starting 48 hours before the scheduled departure time and closing 1.5 hours before the flight. Online check-in can be done through the official website or mobile app and allows passengers to select seats, update travel information, and receive boarding passes electronically. Those who complete online check-in and have no checked baggage may proceed directly to security at the airport. Passengers with checked baggage must arrive early enough to drop off their bags before the check-in counter closes. For airport check-in, counters typically open 3 hours before departure and close 40 minutes before departure for most flights. Some destinations, such as Dhaka and Colombo, have counters that close 50 minutes before departure. It is recommended that passengers with checked baggage arrive at the airport at least 2.5 hours before the flight. For those with carry-on baggage only, arriving at least 1.5 hours before departure is suggested. Singapore Airlines also offers self-service kiosks at selected airports where passengers can check in, print boarding passes, and print baggage tags before heading to the bag drop. After check-in, passengers must complete all security, immigration, and boarding procedures in time. Boarding gates typically close 10 to 15 minutes before departure, and late arrivals may be denied boarding. All travelers should carry required travel documents, including passports, visas, and any health documents necessary for their destination. Early check-in ensures better seat availability and reduces the risk of delays. Checking in early also allows time to resolve any issues that may arise, such as missing documentation or special service requests. Whether checking in online or at the airport, it is important to follow all time limits and arrive with sufficient time to complete all pre-flight requirements. This helps ensure a smooth and stress-free start to the journey with Singapore Airlines.