https://community.expensify.com/discussion/35166/%EF%BC%91-%EF%BC%9...
The United Airlines cancellation policy delivers its flyers with a 24
hour risk-free window, under which passengers can cancel their bookings
for free and will be eligible for a complete refund, regardless of fare
type. However, if you cancel your flight after 24 hours, then you have
to pay a certain amount as a United Airlines cancel flight fee.