There are some details on the return policy, similar to the airline's cancellation policy. Check your eligibility for a refund by reading the information provided below.

The 24-hour flexible booking policy states that, unless the reservation is made at least one week prior to the departure date, tickets that are cancelled within 24 hours of issuance are eligible for a full refund.
If you want a refund for your ticket, go to the Manage booking page on the airline's website and submit a refund request.
United Airlines cancellation fee(https://cutt.ly/ZKZ4lBO) may be charged in accordance with the terms of the purchased tickets.
To get a refund, you must complete the form on United Airlines' official website.
Within seven business days of the refund claim, credit card refunds will be processed for you. All other refunds, however, will be given to you within 20 business days of your request.
The airline will issue a credit for the refund in the original manner of payment.

The United Airlines cancellation refund policy is the main topic here.

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