Of 1,931 sampled departures, 33.8% left 15 minutes or more behind schedule. Average lateness was 21.9 minutes. Sample window: Jan 16, 2026 to May 7, 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) | 102 | 79.4% | 36.0 min |
| Southwest Airlines Co. (WN) | 268 | 62.7% | 36.5 min |
| United Airlines (UA) | 100 | 51.0% | 40.4 min |
| American Airlines (AA) | 189 | 49.7% | 41.7 min |
| Delta Air Lines (DL) | 228 | 49.1% | 39.9 min |
33.8% of this BHM 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 BHM departures that are late right now, in the JSON above.
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