By comparison, if you wanted to book a Singapore Airlines Business Class redemption from Perth to Europe, you'd need at least 119,500 Singapore Airlines KrisFlyer miles. That's equivalent to 239,000 Amex Membership Rewards points at the current 2:1 transfer rate from Amex to KrisFlyer. (From October 2023, the conversion rate from Amex Membership Rewards to KrisFlyer will become 3:1 – meaning you'd need 358,500 Amex points to make the same booking.)