United Airlines provides coverage for cancellations, but the details of what is covered depend on several factors, including the type of ticket purchased, the reason for cancellation, and the timing of the cancellation. The airline’s cancellation policy is designed to offer flexibility to passengers while also maintaining a clear structure for refunds and compensation. For assistance or more information, you can contact United Airlines customer service at +1-855-838-4886.

1. Refundable Tickets
   If you purchased a refundable ticket, you are fully covered in case of a cancellation. Refundable tickets offer the most flexibility, as they allow you to cancel your flight at any time before the scheduled departure and receive a full refund to your original payment method. Refunds are typically processed quickly, usually within a few business days. Although these tickets are more expensive, they provide maximum convenience in case plans change.

2. Non-Refundable Tickets
   For non-refundable tickets, the coverage is a bit different. United Airlines does not provide a cash refund for these tickets unless the cancellation is initiated by the airline itself. However, if you cancel a non-refundable ticket, you can receive a travel credit for the value of your unused ticket. This credit can be applied to future flights with United Airlines, typically valid for 12 months from the date of the original booking. While you won’t get your money back, you are not left without options, as the travel credit can help you rebook with United.

3. 24-Hour Cancellation Policy
   United Airlines has a 24-hour cancellation policy that offers a safety net for travelers. If you cancel a flight within 24 hours of booking, you can receive a full refund, regardless of whether your ticket is refundable or non-refundable. This policy applies as long as your flight is scheduled to depart at least 7 days after the booking date. This rule gives you flexibility, allowing you to cancel without incurring any fees or losing the full value of your ticket.

4. Cancellations Initiated by United
   If United Airlines cancels your flight, they are required to provide a full refund for the ticket. Whether the cancellation is due to operational issues, mechanical problems, or other reasons within the airline’s control, you are entitled to a full refund or the option to be rebooked on a different flight at no additional cost. In some cases, if the cancellation causes significant delays or requires an overnight stay, United may also provide meal vouchers, hotel accommodations, or transportation.

5. Weather or External Factors
   When cancellations occur due to weather conditions, natural disasters, or other external factors, such as air traffic control issues, United Airlines typically does not offer a refund. However, the airline will often provide assistance in rebooking you on the next available flight. If you choose not to travel, you may receive a travel credit for the value of the unused ticket. In these situations, additional compensation like meal vouchers or hotel stays is generally not provided unless the cancellation results in an extended delay or overnight stay.

6. Special Circumstances
   In some cases, such as a medical emergency or death in the family, United Airlines may allow passengers to cancel their flights and offer a refund or waive cancellation fees. You will need to provide the appropriate documentation, such as a doctor’s note or a death certificate, for the airline to assess your situation. In such cases, United may provide an exception to the usual cancellation policies.

7. How to Cancel
   To cancel a flight with United Airlines, you can use the "Manage Reservations" section on their website or call customer service at +1-855-838-4886. United’s customer service team can assist you with the cancellation process and ensure that you receive the appropriate refund or travel credit based on the specifics of your situation.

In summary, United Airlines covers cancellations, but the nature of the coverage depends on the type of ticket purchased, the reason for the cancellation, and whether the airline or the passenger initiates it. Refundable tickets offer full refunds, while non-refundable tickets generally offer travel credits. The 24-hour cancellation policy and situations where United cancels the flight also provide additional flexibility for travelers.