Does Singapore Airlines have an upgrade option?

Singapore Airlines always allows its passengers to enjoy the peak travel experience. Further, they can improve it by using the upgrade options offered by the airline. Moreover, passengers can apply for a Singapore Air upgrade seat by purchasing the mySQupgrade offer online, redeeming KrisFlyer miles, or paying the fare difference. In addition, the request can only be raised through check-in, as online windows are closed 9 hours before departure.