Of 2,063 sampled Y4 departures, 41.1% left 15 minutes or more behind schedule. Average lateness was 18.9 minutes. Sample window: Oct 20, 2025 to Oct 15, 2026.
These are historical aggregates, not live status. A departure is late at 15 minutes past schedule.
| Month | Departures sampled | Late | Average lateness |
|---|---|---|---|
| Nov 2025 | 29 | 44.8% | 37.8 min |
| Jan 2026 | 329 | 35.6% | 15.7 min |
| Mar 2026 | 785 | 34.1% | 16.8 min |
| May 2026 | 222 | 45.5% | 17.0 min |
| Jun 2026 | 68 | 63.2% | 26.9 min |
| Jul 2026 | 195 | 47.2% | 23.6 min |
| Aug 2026 | 177 | 43.5% | 21.8 min |
| Sep 2026 | 154 | 45.5% | 18.3 min |
| Oct 2026 | 74 | 66.2% | 21.5 min |
| Departure airport | Departures sampled | Late | Average lateness |
|---|---|---|---|
| Los Angeles International (LAX) | 859 | 46.2% | 20.8 min |
| Oakland (OAK) | 184 | 15.2% | 5.9 min |
| Midway (MDW) | 133 | 55.6% | 29.8 min |
| Las Vegas (LAS) | 100 | 44.0% | 18.0 min |
| Dallas/Fort Worth International (DFW) | 89 | 38.2% | 16.0 min |
| Denver International (DEN) | 83 | 51.8% | 24.5 min |
| San Antonio (SAT) | 81 | 14.8% | 10.1 min |
| San Jose (SJC) | 72 | 6.9% | 0.9 min |
| George Bush Intercontinental (IAH) | 67 | 67.2% | 37.9 min |
| Orlando International (MCO) | 63 | 54.0% | 24.0 min |
GET /flight_delays filtered by airline_iata=Y4 returns the flights delayed at this moment: flight number, scheduled and actual times and minutes of delay.
https://www.goflightlabs.com/flight_delays?access_key=YOUR_ACCESS_KEY&delay=15&type=departures&airline_iata=Y4
That URL still says YOUR_ACCESS_KEY.
A 7-day trial replaces it with a real key. After the trial, Starter is $24.99/mo.