Check if an airline flight is on time by using a flight tracker website, such as FlightStats and Flight View, or the airline's website. Flight situations can change quickly and can affect scheduled flights. Passengers should check in based on the original departure time unless the flight has been cancelled, recommends United.
Flight tracker websites provide arrivals, departures and delays in real time, so passengers can have the most up-to-date information on their flight statuses. Many flight trackers also show on-time performance percentage and average delay for a particular flight. FlightStats also provides an overall rating for the flight based on performance.