A popular bank card of 15,000 “miles” to deliver purchases to $ 150.00. If your purchase will cost $ 150.01, you must get to 35,000 miles, a loan. In this system, you may not be able to redeem your miles at once, without a lot of reward value. Conditions for redemption awards in Travel reward credit cards have changed a lot over the years and vary depending on the company. Some require that you buy only from their travel agent. Others you can buy from any vendor of your choice, but impose a redemption structure as described above may miles left on the table. Be sure you understand exactly how the system works before you apply.