Originally Posted by
fimo
By the book you'll need to potentially pay a rebooking fee and can only be rebooked to an available award seat. However if you're lucky, they would do so gratis, especially if you have status. I missed my flight due to mad Beijing traffic, and they rebooked me on the next flight at the SQ office in PEK. I was garden variety PPS at the time iirc.
I've missed an SQ flight due to delayed UA domestic on separate tickets, and I did not thru-checked my bags. They changed my flights for me without charges. I had, at most most Krisflyer silver status only. But that was >5 years ago.