Originally Posted by joe_miami

Thanks again. It looks like there's a 60-minute (AirAsia, Jetstar) or 40-minute (Scoot) check-in cutoff for the SIN-KUL flights. It appears check-in at SIN must be done in person rather than via mobile app (?), so even without any checked bags, I'm probably going to need at least 90 minutes between arriving at SIN and trying to depart to KUL.

I assume those deadlines also apply to walk-up sales, but unless someone here has tried it, I might just have to see how it goes upon arrival.