https://zagspace.gonzaga.edu/forum/call-now-united-cancellation-policy-24-hours

Refunds. You have 24 hours from the time you first buy your ticket for a refund if you booked at least 2 days before departure. The 24-hour refund policy applies to all ticket types, but you have to cancel the trip to get a refund.* Reservations booked as part of group block do not qualify for the…