Experts from The MileLion and The Points Guy recommend these methods to "buy" miles at a lower cost:

This can be done online during the booking process at Singapore Airlines . 2. Strategic Alternatives (Cheaper "Buying")

Buying KrisFlyer miles directly from Singapore Airlines is generally considered a due to the high cost of US$0.04 per mile . Most travelers instead use credit card transfers or bill payment services to acquire miles at a much lower effective rate. 1. Buying Directly from Singapore Airlines

Transfer points from major programs like Chase Ultimate Rewards, American Express Membership Rewards, Capital One, and Citi ThankYou at a 1:1 ratio .

You can convert Marriott Bonvoy points to KrisFlyer, though the value is often lower than direct airline redemptions. 3. Critical Risks to Avoid

You can buy miles directly to top up your account, but strict conditions apply:

Miles must be used immediately for a specific redemption; you cannot buy them to hold in your account for future use.

While third-party "mileage brokers" or marketplaces like Carousell may offer lower prices, using them is by Singapore Airlines.