Feeling sick or unwell? Wondering how to complete your journey or if you can cancel your flight? You don’t have to worry about it as long as you are flying with United Airlines. This leading air carrier handles sick passengers with care and requires a few documents to board them on the flight. If you are not able to complete the journey, simply cancel your tickets with a few simple taps and make a refund request. Passengers canceling their flights within 24 hours of the departure are eligible for a full refund without any special documents. However, if you cancel afterward, then you may require some documents, according to United Airlines Passengers Sick policy, to get 100% of your ticket value.