United Airlines Change Flight
Yes, you can change your United Airlines flight, but whether or not you face a penalty depends on your ticket type and the timing of the change. For flexible tickets, changes can often be made with little or no fee, especially if you do it well in advance. Basic Economy tickets usually come with stricter rules and may incur higher fees. You can make changes online through their website or app, or by directly contact customer service at +1 (844) 733-1212 for assistance. Our customer executive will guide you with proper guidance.
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Unpublishedflight Deals's answer to Can I change my United Airlines flight without a penalty? - Quora

Unpublishedflight Deals's answer: Yes, you can do it. United Airlines change flight, but sometimes you face a penalty depends on your ticket type and the timing of the change. For flexible tickets, changes can often be made with little or no fee