Of 1,252 sampled departures, 53.3% left 15 minutes or more behind schedule. Average lateness was 36.1 minutes. Sample window: Jan 16, 2026 to Mar 27, 2026.
These are historical aggregates, not live status. A departure is late at 15 minutes past schedule.
| Airline | Flights sampled | Late | Average lateness |
|---|---|---|---|
| ChallengAir (1I) | 41 | 85.4% | 56.4 min |
| Southwest Airlines Co. (WN) | 191 | 69.6% | 42.3 min |
| American Airlines (AA) | 185 | 64.9% | 46.4 min |
| Envoy Air Inc. (MQ) | 51 | 64.7% | 31.2 min |
| Frontier Airlines, Inc. (F9) | 39 | 61.5% | 44.2 min |
53.3% of this BUF sample left 15 minutes late or more.
GET /flight_delays returns the ones that are late at this moment: airline, flight number, scheduled time, actual time and minutes of delay.
Field names match the live API. This flight only shows the shape. It is not a live result.
That URL still says YOUR_ACCESS_KEY.
A 7-day trial replaces it with a real key and returns the BUF departures that are late right now, in the JSON above.
After the trial, Starter is $24.99/mo.
