The simplest answer to that would be, no, the process of cancelling a flight with United Airlines is hasslefree and travel-centric.You can cancel your flight easily online as well as over a call with the customer care helpline number, provided it is done at least 3 hours before departure, you’re also eligible for a refund.
https://trvelideas.weebly.com/blog/knowledge-about-united-airlines-cancellation-policy