Of 5,152 sampled departures, 64.9% left 15 minutes or more behind schedule. Average lateness was 37.9 minutes. Sample window: Jan 16, 2026 to Aug 11, 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) | 281 | 81.9% | 49.7 min |
| Southwest Airlines Co. (WN) | 3,736 | 72.0% | 41.5 min |
| Volaris (Y4) | 133 | 55.6% | 29.8 min |
| Frontier Airlines, Inc. (F9) | 79 | 53.2% | 39.4 min |
| Delta Air Lines (DL) | 208 | 52.9% | 27.1 min |
64.9% of this MDW 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.
https://www.goflightlabs.com/flight_delays?access_key=YOUR_ACCESS_KEY&delay=15&type=departures&dep_iata=MDWField names match the live API. This flight only shows the shape. It is not a live result.
{
"success": true,
"data": [
{
"airline_iata": "AA",
"flight_iata": "AA100",
"flight_number": "100",
"dep_iata": "MDW",
"dep_time": "2024-03-15 08:00",
"dep_actual": "2024-03-15 08:22",
"dep_delayed": 22,
"status": "active"
}
]
}
That URL still says YOUR_ACCESS_KEY.
A 7-day trial replaces it with a real key and returns the MDW departures that are late right now, in the JSON above.
After the trial, Starter is $24.99/mo.