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Definition: ETD

It stands for Expected Time of Departure. It refers to the time when the journey will begin. Generally, railways, buses and airlines use this terminology to denote expected time at which particular train, bus or flight will depart from the source to respective destinations. ETD is liable to change and depends upon other factors like Expected Time of Arrival (ETA) of previous journey, ETA of other flights, time taken in maintenance work, congestion etc.

ETDs are used as benchmark for performance of transportation service providers. In any case of delay, fines may be charged to service providers. Many processes like ticket booking, check in etc. are linked with ETD. Although, it’s just a tentative timing, carriers take it very seriously and try to maintain it.

ETA also depends upon ETD for calculation purpose. The formula for calculating ETA can be written as follows:

ETA=ETD+ distance/(avg.speed)


It doesn’t take unexpected events into account. In any journey ticket, both ETA and ETD are mentioned clearly. It also helps passengers in choosing their carrier accordingly.

Example: Suppose ETD for a bus is 7 AM and distance between source and destination is 200 km. Also average speed of bus measured over period of time is 40 km then; ETA of the bus will be 12 noon. Similarly, if there are 3 buses with ETD of 7 AM, 8 AM and 9 AM respectively, one can chose among them based on one’s convenience. In this way, ETD and ETA are very important information.



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