How to cancel a reservation on United Airlines?
Cancel online flight
Look at United Airlines’ website.
The following information will be requested when you visit my trips:
MileagePlus number or confirmation number
Select the search icon.
Log in to your United Airlines account, pick Manage, and then select Cancel from the options on the far right.
Click the cancel tab after selecting the flight you want to cancel.
Following the deduction of the Cancellation fee, you will now be given a United Airlines e-credit.
Read more : Hawaiian Airlines cancellation fee