Ideally, we recommend booking reliable movers and packers two months before your move date.
In the worst-case scenario, at least four weeks before. However, as you only have a month or less before your move, you will have a limited choice of moving companies as most good movers in Singapore are booked two to three months prior.
There are also exceptions. During the off-season, you should be able to book a reliable moving company 1-2 weeks in advance.
If possible, we advise you to book professional movers earlier just to stay on the safe side.