Without a promotion, Amtrak Guest Rewards points cost 3.77 cents per point. As of February 2026, Amtrak is running a high-fidelity "Buy Points" promotion through February 28, offering up to a 50% bonus. This tiered bonus allows you to purchase points for as low as 2.51 cents each if you buy 10,500 points or more. The standard increments for buying points are 500-point blocks, and you are generally capped at purchasing 50,000 points per calendar year (though this limit is often waived for elite "Select" members). Buying points is most "worth it" when you are just a few hundred points short of a high-value "Award Flight"—for example, a long-distance roomette booking—where the "cents-per-point" value of the redemption exceeds the 3.77c purchase price. For those looking to maximize their points, using a "Preferred Mastercard" to earn 3x points on travel is generally more cost-effective, but these "Flash Sale" bonuses represent the cheapest way to "top up" an account for an immediate trip.