United Mileage Plus Visa cardmembers could be one purchase away from landing the trip of their dreams, courtesy of United Mileage Plus and Bank One. With every purchase cardmembers make until Sept. 30, they will automatically be entered into the Million Mile Giveaway to win a daily prize of 25,000 miles — enough for a roundtrip ticket within the continental U.S. or Canada. A random daily drawing will determine each of the 50 winners who will receive 25,000 miles. A total of 1.25 million miles will be awarded as part of the More Miles program.