In case of cancellation of your United flight, depending on the circumstance, you can be reimbursed fully or get a free rebooking on the next flight. United Airlines Cancellation Policy usually provides travel credits when fare is not refundable whereas reimbursement of the payment method of each fare is refundable. Compensation can also be set depending on the fact of the long delay or disturbance of your plans in case of cancellation. As stated in the United Airlines, the passengers can email or check the booking information about the available options in case of involuntary cancellations. You should always remain abreast of airline announcements so that you can make timely adjustments to your travel.