Singapore allows same-day ticket changes within 24 hours of the flight's originally scheduled departure time. Same-day flight changes are subject to seat availability and are only possible under the following circumstances:

Change Singapore Airlines Flight says If you don’t change or cancel your ticket before departure, it will have no remaining value later.

If your new flight ticket is cheaper, the… Continue

The airline gives all passengers a one-day window after booking to cancel tickets if they have some second thoughts on a travel decision. Please note that this window is only for the first 24 hours after purchase and you will be required to pay a Virgin Australia cancellation fee to cancel Virgin Australia flight tickets after this fixed time. This fee depends on various factors which may or may not apply to all passengers. Type of fare selected by passenger during reservations, duration… Continue