Book your reward flight by visiting your airline's website to make a flight reservation. Log in to your account so the airline recognizes you and your frequent flier mile account.
Click on the link to your airline's frequent flier program and scroll down to the selection titled "Make Reward Reservation."
Enter your flight destination, departure city and your departure dates and search for a reward flight. The results will show all available reward flights for those dates and let you pick the one that works with your schedule. From here you will confirm your flight, your seat and your identity. Your airline will bring up your frequent flier mile account and show you whether or not you have enough miles for your trip. If you do, your points will decrease once you confirm your booking.
Check in and board your flight the same way you would if it were a regular flight rather than a reward flight. Understand that you do not earn frequent flier miles on reward flights.
Call your airline on its reservations line to book a flight using your miles.