On-time performance refers to the punctuality of a service, such as airlines, trains, or buses, in adhering to their scheduled arrival and departure times. It is a key metric used to evaluate the efficiency and reliability of transportation services, impacting customer satisfaction and operational effectiveness. This performance is often measured as a percentage, indicating how many trips were completed on time compared to the total number of trips. High on-time performance rates suggest that a service is dependable, while low rates may indicate issues such as delays, cancellations, or operational challenges.