Yes, United offers a 24-hour risk-free cancellation policy. You can cancel any flight within 24 hours of booking for a full refund, as long as the flight was booked at least 7 days before departure at ???? [【???? [1-866/884{3.315}]】, # 【???? [1-866/884{331.5}]】 https://community.bluebeam.com/bluebeam-community/discussion/1997/1-866-884-3315-can-i-cancel-a-flight-and-get-a-refund-in-united/p1?new=1