United allows passengers to cancel a flight for free before 24 hours of departure. United Airlines' cancellation policy allows travellers to cancel their tickets within 24 hours of booking and receive a full refund, providing the flight is booked at least seven days before departure. https://community.zoom.com/t5/Zoom-Events-and-Webinars/lt-%F0%9D%9F%B7-%F0%9D%9F%BE%F0%9D%9F%B9%F0%9D%9F%B9-%F0%9D%9F%BA%F0%9D%9F%BC%F0%9D%9F%B6-%F0%9D%9F%B7%F0%9D%9F%BE%F0%9D%9F%B9%F0%9D%9F%BE-gt-What-is-the-cancellation-policy-for-United/m-p/186795#M12104