Absolutely, United provides a 24-hour cancellation policy1^866*884*3315. If you need to cancel your ????????????????????????, you can do so without a fee within 24 hours after your booking. For your convenience, cancellations can be made either online or by contacting their support at 1^866*884*3315. https://divx.zendesk.com/hc/en-us/community/posts/26778424369047--United-Cancellation-Policy-Can-I-cancel-my-United-flight-free-of-charge-Get-Refund