Of 1,052 sampled departures, 32.0% left 15 minutes or more behind schedule. Average lateness was 20.7 minutes. Sample window: Dec 1, 2025 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 |
|---|---|---|---|
| United Airlines (UA) | 117 | 71.8% | 59.1 min |
| Southwest Airlines Co. (WN) | 155 | 64.5% | 34.2 min |
| American Airlines (AA) | 46 | 56.5% | 35.6 min |
| SkyWest Airlines (OO) | 28 | 53.6% | 43.8 min |
| Delta Air Lines (DL) | 75 | 52.0% | 42.6 min |
32.0% of this COS 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 COS departures that are late right now, in the JSON above.
After the trial, Starter is $24.99/mo.
