Transfer points from major programs like Chase Ultimate Rewards, American Express Membership Rewards, Capital One, and Citi ThankYou at a 1:1 ratio .
The standard rate is US$0.04 per mile (roughly US$40 per 1,000 miles).
Platforms like Citi PayAll or CardUp allow you to pay rent, taxes, or bills with a credit card for a small fee, effectively "buying" miles for roughly 1 to 1.5 cents each.
You must already have at least 50% of the miles required for your intended award flight or upgrade.