You can check in for Singapore Airlines flights as early as 48 hours before departure through online check-in via the airline’s website or mobile app. This service allows passengers to select seats, update travel details, and receive boarding passes electronically. Online check-in closes 1.5 hours before the scheduled departure time. For those using the automatic check-in feature, Singapore Airlines will automatically check you in 48 hours before departure and send your boarding pass to your email, with the option to make changes up until 90 minutes before the flight.

At the airport, check-in counters generally open 48 hours before departure and close 40 minutes before takeoff, although specific timings can vary depending on the airport and destination. At Singapore Changi Airport, passengers can also take advantage of the Early Check-In facility at Jewel, which allows check-in and baggage drop between 3 to 24 hours before flight departure. This service operates daily from 8:00 a.m. to 11:59 p.m., though it is not available for flights to the United States.

Self-service kiosks are available at select airports and typically open 24 hours before departure. These kiosks allow you to check in, choose seats, and print boarding passes and bag tags. If you use a kiosk, you must still drop off checked luggage at the designated counters before the cut-off time. Passengers are advised to arrive at the airport at least 2.5 hours before an international flight if they have checked baggage or 1.5 hours before if they are traveling with carry-on only.

Boarding gates for Singapore Airlines flights generally close 10 minutes before departure, and all passengers are expected to be at the gate on time, regardless of check-in method. Failing to arrive before gate closure can result in denied boarding even with a valid boarding pass.

In summary, Singapore Airlines check-in opens 48 hours before departure online and closes 90 minutes prior. Airport counter check-in opens up to 48 hours before departure and closes 40 minutes before. Jewel Early Check-In allows passengers to check in between 3 and 24 hours before departure, except for U.S.-bound flights. Kiosk check-in usually opens 24 hours before departure. Boarding gates close 10 minutes before scheduled takeoff. Arrive at the airport at least 2.5 hours before departure if checking bags or 1.5 hours before with hand luggage only.