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Overview

On-time departure and arrival  is generally considered to be achieved by any flight that takes off less than 15 minutes after scheduled departure time or arrives at a gate 15 minutes before the scheduled arrival time. Airlines with high OTP (On-Time Performance) have consistent on-time arrival and departure operations across their flight schedules. OTP provides a standardised mechanism to compare how service providers operate in accordance with their published schedules and with their competitors.

According to OAG (a leading flight Information provider and SITA partner)OTP

"most people in the industry would accept that an OTP of 80% or above is pretty good. That’s 4 in 5 flights arriving within 15 minutes of their scheduled arrival time. The very best airlines and airports succeed in punctuality closer to 90% - but they remain the exception rather than the rule."

 

Calculating OTP

SITA measures on-time performance by capturing millions of flight records and real-time updates from airports around the globe every day and makes this available via the OTP API. 

On-Time Performance for Airlines is expressed as the percentage of flights operated by a particular carrier which have arrived on-time.

  • A flight is considered on-time when it arrives within 15 minutes of the schedule time.
  • Canceled flights do not count as on-time flights.
  • On-time performance is calculated based only on flights for which the actual time of arrival is available (including canceled flights).

Similarly, the On-Time Performance for Airports is the percentage of flights that have departed on-time.

  • A flight is considered on-time when it departs within 15 minutes of the scheduled time.
  • Canceled flights do not count as on-time flights.
  • The On-Time performance is calculated based only on flights for which the actual time of arrival is available (including canceled flights).
  • All times used in calculations are gate times.

External disruptions such as adverse weather conditions and industrial actions can cause delays for operators therefore is is important to take these into account.

Check out our Reference Documentation tab for more details

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