Of 900 sampled ZH departures, 48.1% left 15 minutes or more behind schedule. Average lateness was 26.4 minutes. Sample window: Oct 17, 2025 to Oct 15, 2026. Its published schedule has about 148 flights a week on 14 routes.
These are historical aggregates, not live status. A departure is late at 15 minutes past schedule.
| Month | Departures sampled | Late | Average lateness |
|---|---|---|---|
| Nov 2025 | 138 | 71.0% | 29.7 min |
| Apr 2026 | 25 | 48.0% | 15.5 min |
| May 2026 | 668 | 41.0% | 26.6 min |
| Sep 2026 | 23 | 60.9% | 17.8 min |
| Departure airport | Departures sampled | Late | Average lateness |
|---|---|---|---|
| Shenzhen (SZX) | 640 | 43.3% | 28.1 min |
| Heathrow (LHR) | 58 | 63.8% | 17.4 min |
| Beijing Capital International (PEK) | 51 | 51.0% | 22.3 min |
| Singapore Changi (SIN) | 51 | 54.9% | 22.7 min |
| Seoul (Incheon) (ICN) | 38 | 55.3% | 20.8 min |
| Suvarnabhumi International (BKK) | 24 | 79.2% | 30.4 min |
GET /flight_delays filtered by airline_iata=ZH 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=ZH
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.