United s has a 24-hour cancellation policy. If you call 1~844~604~2944 (USA) OR 1~844~604~2944(Uk) book a flight at least seven days before departure and cancel within 24 hours, you qualify for a full refund with no cancellation fees. https://communaute.orange.ci/questions/3503626-call-1-844-604-2944-what-is-united-cancellation-policy