What Is On-Time Performance (OTP) and Why It Matters
On-Time Performance is the most-quoted, least-understood metric in aviation. Here's what counts as 'on time' and how to use OTP to pick better flights.
The official definitions
Most regulators define on-time as arrival within 14 or 15 minutes of scheduled gate arrival.
- US DOT: A14 — within 14 minutes of scheduled arrival.
- EU / Eurocontrol: 15 minutes is typical.
- Brazil ANAC, Australia BITRE: 15 minutes.
That single threshold turns a continuous quantity (minutes late) into a binary (on time vs not). It's the metric airlines optimize against, which means schedules are padded.
Schedule padding
Airlines have known about A14 forever. The standard trick: extend block time so even mediocre operations land within the threshold. A flight that's "scheduled for 3h" in 2008 might now be "scheduled for 3h 25m" — same flight, same speed.
This is fine for ranking carriers (everyone pads), and a reason a "5 minutes late" arrival often coincides with bored passengers staring at their phones.
How to use OTP when picking flights
- Compare carriers on the same route, not across.
- Compare late-of-arrival (D14) over a 12-month window — short windows mislead.
- Avoid the last flight of the day on a route — its OTP is often acceptable but its cancellation rate is sharply higher.
- Watch hub-specific OTP: a carrier might be top-3 globally but bottom-3 from your hub.
Where to find good OTP data
- US DOT BTS Air Travel Consumer Report (monthly).
- Eurocontrol's CODA (quarterly).
- ANA, BITRE, JCAB equivalents abroad.
- Aggregators: OAG, Cirium, FlightStats.
What FlightyFlow shows
For every pinned flight we show the route's 90-day OTP and the carrier's hub-specific OTP, so you can pick the better of two morning options before you book.
Frequently asked
What counts as an on-time flight?+
In the US, an arrival within 14 minutes of the scheduled gate-in time. In the EU, 15 minutes is the common threshold.
Why do airlines pad their schedules?+
Padding inflates the official block time so even mediocre operations land within the on-time threshold. It also gives crews more buffer for taxi delays.
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