The "value" of $100 in air miles depends entirely on the airline's specific rewards currency, but as a general rule of thumb in 2026, $100 is roughly equivalent to 8,000 to 10,000 miles. Most travel experts value a standard airline mile at approximately 1.2 to 1.5 cents. For example, on Delta or Southwest, where points are closely tied to the cash price of a ticket, you would likely need about 8,500–9,500 miles to cover a $100 fare (plus taxes). On "premium" programs like American Airlines or United, $100 worth of value is often closer to 7,500 miles if used for high-value international redemptions, or up to 12,000 miles if used for low-value "merchandise" or "pay with points" options. If you are buying miles directly from an airline, $100 will usually only get you about 3,000 to 4,000 miles, because airlines sell them at a massive markup. Therefore, the "worth" of $100 changes significantly depending on whether you are earning, redeeming, or purchasing the miles, making it essential to calculate the "cents per point" (CPP) for every booking.