A United Missed Flight occurs when a passenger fails to arrive at the gate before the scheduled departure time. In such cases, United offers rebooking options depending on the fare type and availability of the next flight. Passengers can request to be accommodated on the next available flight, make changes to their itinerary, or cancel their trip altogether. Depending on the fare type, United may charge fees for changes or cancellations. Passengers are advised to check their flight status before arriving at the airport, arrive early, and allow sufficient time for check-in, security, and boarding. In case of delays or unexpected circumstances, United recommends contacting their customer service for assistance.