With the Discover it Miles Credit Card, when you're ready to redeem your Miles, 100 Miles = $1 to redeem for cash or travel credit. The great thing about the Miles that you earn with the Discover travel card is that they can be used to cover all or part of a travel expense. So the amount of credit card Miles that you'll need to redeem to cover your entire airline ticket will depend on the price of the flight that you booked. This goes for other travel purchases, too, including rideshares or rental car bookings. Remember—you can redeem your Miles for a statement credit for all or part of your travel purchase, to help keep your total costs down.