You earn your KrisFlyer miles by flying with the airline and its alliance cohorts, or collecting through credit cards and other partner earning options, but you can't buy miles directly.
People Also Ask
It's not illegal to buy KrisFlyer miles. There's a lot of things in your browsing history that will make the FBI kick down your door, but buying KrisFlyer miles is not one of them. That said, the selling of KrisFlyer miles and award tickets is against the T&Cs of the KrisFlyer programme.
Singapore KrisFlyer miles are worth about 1.5 cents each when redeemed for economy award flights. You might be able to get a slightly higher value if you book holiday flights with points.
KrisFlyer miles expire 36 months from the month you earn them. For example, miles earned in March 2023 will expire on March 31, 2026. Even if you regularly earn or redeem Krisflyer miles during the year, your miles expire after three years.
Basically: any KrisFlyer miles will expire three years after they were earned, with the exception of miles won from contests, which expire after one year.
On flights which offer Premium Economy Class, you can choose to upgrade from Economy Class to either Premium Economy Class or Business Class. Not available for Lite or Value fare types. Not available for Economy Lite fare types, or for multi-city bookings.