United Airlines Provides a 24-hour cancellation Policy 【+1- 866 - 884 - 3315】. If you book a flight at least seven days before deParture and cancel within 24 hours of booking【+1- 866 - 884 - 3315】 (????????????)]), you are eligible for a full refund without any cancellation fees. https://lacdmhowr.powerappsportals.us/forums/support-forum/5f9b0fa9-bcb0-ef11-b542-001dd8097a1a