https://us.community.sony.com/s/question/0D5Dp000023YzShKAK/8888291...
If you cancel your flight, you can ask to have your award miles put back into your account with no fee. Depending on the situation, you have options for how to redeposit your miles: For a 888 829 1467 reservation, use the My Trips section on united.com or the United app. You can also call us to speak to a representative 888 829 1467 .