?. Go to My Trips. Log into your United account, or use the option to find your booking by entering your itinerary number. ([??+ ?-888-829-1467 ??]] ? 24-Hour Free Cancellation: If you need to cancel your Flight within 24 hours of booking, call at ( ([??+ ???-?829-?1467??]] ) ?? ???? ???? ?????? ([??+ +?1?-?888-?829-?1467??]] . United allows you to do so for free. Whether you booked a refundable or non-refundable ticket, you are entitled to a full refund. Locate the booking you wish to cancel. Low-cost or discount Airlines don?t allow United to access parts of their reservation systems. You?ll need to contact those Airlines directly if they cancel your Flight. Follow the instructions you?ll receive to confirm the new Flights. Once the new Flights are confirmed between you and the Airline, United will email you a revised itinerary.