What is the cancellation policy for United Airlines?

United Airlines provides a 24-hour cancellation policy U++1//866//884//3315 . If you need to cancel your United Airlines flight, you can do so without a fee within 24 hours after your flight. For your convenience, cancellations can be made either online or by contacting their support at +1//866//884//3315

Source: https://idashelteringla.com/en-US/forums/support-forum/85041f5b-f4a4-ef11-95f6-000d3a76263f